* [PATCH v4 01/11] selftests/kvm: Fix issues with $(SPLIT_TESTS)
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-12 9:31 ` [PATCH v4 02/11] KVM: arm64: selftests: Split arch_timer test code Haibo Xu
` (9 subsequent siblings)
10 siblings, 0 replies; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paolo Bonzini, Paul Walmsley,
Palmer Dabbelt, Albert Ou, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale,
Greentime Hu, Daniel Henrique Barboza, Samuel Holland,
Jisheng Zhang, Minda Chen, Sean Christopherson, Like Xu, Peter Xu,
Vipin Sharma, Aaron Lewis, Maciej Wieczor-Retman, Thomas Huth,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
From: Paolo Bonzini <pbonzini@redhat.com>
From: Paolo Bonzini <pbonzini@redhat.com>
The introduction of $(SPLIT_TESTS) also introduced a warning when
building selftests on architectures that include get-reg-lists:
make: Entering directory '/root/kvm/tools/testing/selftests/kvm'
Makefile:272: warning: overriding recipe for target '/root/kvm/tools/testing/selftests/kvm/get-reg-list'
Makefile:267: warning: ignoring old recipe for target '/root/kvm/tools/testing/selftests/kvm/get-reg-list'
make: Leaving directory '/root/kvm/tools/testing/selftests/kvm'
In addition, the rule for $(SPLIT_TESTS_TARGETS) includes _all_
the $(SPLIT_TESTS_OBJS), which only works because there is just one.
So fix both by adjusting the rules:
- remove $(SPLIT_TESTS_TARGETS) from the $(TEST_GEN_PROGS) rules,
and rename it to $(SPLIT_TEST_GEN_PROGS)
- fix $(SPLIT_TESTS_OBJS) so that it plays well with $(OUTPUT),
rename it to $(SPLIT_TEST_GEN_OBJ), and list the object file
explicitly in the $(SPLIT_TEST_GEN_PROGS) link rule
Fixes: 17da79e009c3 ("KVM: arm64: selftests: Split get-reg-list test code", 2023-08-09)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Andrew Jones <ajones@ventanamicro.com>
---
tools/testing/selftests/kvm/Makefile | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 52c59bad7213..2200f06b740b 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -251,32 +251,36 @@ LIBKVM_C_OBJ := $(patsubst %.c, $(OUTPUT)/%.o, $(LIBKVM_C))
LIBKVM_S_OBJ := $(patsubst %.S, $(OUTPUT)/%.o, $(LIBKVM_S))
LIBKVM_STRING_OBJ := $(patsubst %.c, $(OUTPUT)/%.o, $(LIBKVM_STRING))
LIBKVM_OBJS = $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ) $(LIBKVM_STRING_OBJ)
-SPLIT_TESTS_TARGETS := $(patsubst %, $(OUTPUT)/%, $(SPLIT_TESTS))
-SPLIT_TESTS_OBJS := $(patsubst %, $(ARCH_DIR)/%.o, $(SPLIT_TESTS))
+SPLIT_TEST_GEN_PROGS := $(patsubst %, $(OUTPUT)/%, $(SPLIT_TESTS))
+SPLIT_TEST_GEN_OBJ := $(patsubst %, $(OUTPUT)/$(ARCH_DIR)/%.o, $(SPLIT_TESTS))
TEST_GEN_OBJ = $(patsubst %, %.o, $(TEST_GEN_PROGS))
TEST_GEN_OBJ += $(patsubst %, %.o, $(TEST_GEN_PROGS_EXTENDED))
TEST_DEP_FILES = $(patsubst %.o, %.d, $(TEST_GEN_OBJ))
TEST_DEP_FILES += $(patsubst %.o, %.d, $(LIBKVM_OBJS))
-TEST_DEP_FILES += $(patsubst %.o, %.d, $(SPLIT_TESTS_OBJS))
+TEST_DEP_FILES += $(patsubst %.o, %.d, $(SPLIT_TEST_GEN_OBJ))
-include $(TEST_DEP_FILES)
-$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): %: %.o
+x := $(shell mkdir -p $(sort $(OUTPUT)/$(ARCH_DIR) $(dir $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ))))
+
+$(filter-out $(SPLIT_TEST_GEN_PROGS), $(TEST_GEN_PROGS)) \
+$(TEST_GEN_PROGS_EXTENDED): %: %.o
$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $< $(LIBKVM_OBJS) $(LDLIBS) -o $@
$(TEST_GEN_OBJ): $(OUTPUT)/%.o: %.c
$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
-$(SPLIT_TESTS_TARGETS): %: %.o $(SPLIT_TESTS_OBJS)
+$(SPLIT_TEST_GEN_PROGS): $(OUTPUT)/%: $(OUTPUT)/%.o $(OUTPUT)/$(ARCH_DIR)/%.o
$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $^ $(LDLIBS) -o $@
+$(SPLIT_TEST_GEN_OBJ): $(OUTPUT)/$(ARCH_DIR)/%.o: $(ARCH_DIR)/%.c
+ $(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
EXTRA_CLEAN += $(GEN_HDRS) \
$(LIBKVM_OBJS) \
- $(SPLIT_TESTS_OBJS) \
+ $(SPLIT_TEST_GEN_OBJ) \
$(TEST_DEP_FILES) \
$(TEST_GEN_OBJ) \
cscope.*
-x := $(shell mkdir -p $(sort $(dir $(LIBKVM_C_OBJ) $(LIBKVM_S_OBJ))))
$(LIBKVM_C_OBJ): $(OUTPUT)/%.o: %.c $(GEN_HDRS)
$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
@@ -290,7 +294,7 @@ $(LIBKVM_STRING_OBJ): $(OUTPUT)/%.o: %.c
$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -ffreestanding $< -o $@
x := $(shell mkdir -p $(sort $(dir $(TEST_GEN_PROGS))))
-$(SPLIT_TESTS_OBJS): $(GEN_HDRS)
+$(SPLIT_TEST_GEN_OBJ): $(GEN_HDRS)
$(TEST_GEN_PROGS): $(LIBKVM_OBJS)
$(TEST_GEN_PROGS_EXTENDED): $(LIBKVM_OBJS)
$(TEST_GEN_OBJ): $(GEN_HDRS)
--
2.34.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v4 02/11] KVM: arm64: selftests: Split arch_timer test code
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
2023-12-12 9:31 ` [PATCH v4 01/11] selftests/kvm: Fix issues with $(SPLIT_TESTS) Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-14 6:41 ` Anup Patel
2023-12-12 9:31 ` [PATCH v4 03/11] KVM: selftests: Add CONFIG_64BIT definition for the build Haibo Xu
` (8 subsequent siblings)
10 siblings, 1 reply; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale,
Greentime Hu, Heiko Stuebner, Samuel Holland, Minda Chen,
Jisheng Zhang, Sean Christopherson, Peter Xu, Like Xu,
Vipin Sharma, Maciej Wieczor-Retman, Thomas Huth, Aaron Lewis,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
Split the arch-neutral test code out of aarch64/arch_timer.c
and put them into a common arch_timer.c. This is a preparation
to share timer test codes in riscv.
Suggested-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
tools/testing/selftests/kvm/Makefile | 3 +-
.../selftests/kvm/aarch64/arch_timer.c | 275 +-----------------
tools/testing/selftests/kvm/arch_timer.c | 249 ++++++++++++++++
.../testing/selftests/kvm/include/test_util.h | 2 +
.../selftests/kvm/include/timer_test.h | 43 +++
5 files changed, 302 insertions(+), 270 deletions(-)
create mode 100644 tools/testing/selftests/kvm/arch_timer.c
create mode 100644 tools/testing/selftests/kvm/include/timer_test.h
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 2200f06b740b..4838ea899bbb 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -151,7 +151,6 @@ TEST_GEN_PROGS_x86_64 += system_counter_offset_test
TEST_GEN_PROGS_EXTENDED_x86_64 += x86_64/nx_huge_pages_test
TEST_GEN_PROGS_aarch64 += aarch64/aarch32_id_regs
-TEST_GEN_PROGS_aarch64 += aarch64/arch_timer
TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
TEST_GEN_PROGS_aarch64 += aarch64/hypercalls
TEST_GEN_PROGS_aarch64 += aarch64/page_fault_test
@@ -163,6 +162,7 @@ TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
TEST_GEN_PROGS_aarch64 += aarch64/vgic_irq
TEST_GEN_PROGS_aarch64 += aarch64/vpmu_counter_access
TEST_GEN_PROGS_aarch64 += access_tracking_perf_test
+TEST_GEN_PROGS_aarch64 += arch_timer
TEST_GEN_PROGS_aarch64 += demand_paging_test
TEST_GEN_PROGS_aarch64 += dirty_log_test
TEST_GEN_PROGS_aarch64 += dirty_log_perf_test
@@ -201,6 +201,7 @@ TEST_GEN_PROGS_riscv += kvm_page_table_test
TEST_GEN_PROGS_riscv += set_memory_region_test
TEST_GEN_PROGS_riscv += kvm_binary_stats_test
+SPLIT_TESTS += arch_timer
SPLIT_TESTS += get-reg-list
TEST_PROGS += $(TEST_PROGS_$(ARCH_DIR))
diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
index 274b8465b42a..6fb47ba07e5b 100644
--- a/tools/testing/selftests/kvm/aarch64/arch_timer.c
+++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
@@ -1,64 +1,19 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * arch_timer.c - Tests the aarch64 timer IRQ functionality
- *
* The test validates both the virtual and physical timer IRQs using
- * CVAL and TVAL registers. This consitutes the four stages in the test.
- * The guest's main thread configures the timer interrupt for a stage
- * and waits for it to fire, with a timeout equal to the timer period.
- * It asserts that the timeout doesn't exceed the timer period.
- *
- * On the other hand, upon receipt of an interrupt, the guest's interrupt
- * handler validates the interrupt by checking if the architectural state
- * is in compliance with the specifications.
- *
- * The test provides command-line options to configure the timer's
- * period (-p), number of vCPUs (-n), and iterations per stage (-i).
- * To stress-test the timer stack even more, an option to migrate the
- * vCPUs across pCPUs (-m), at a particular rate, is also provided.
+ * CVAL and TVAL registers.
*
* Copyright (c) 2021, Google LLC.
*/
#define _GNU_SOURCE
-#include <stdlib.h>
-#include <pthread.h>
-#include <linux/kvm.h>
-#include <linux/sizes.h>
-#include <linux/bitmap.h>
-#include <sys/sysinfo.h>
-
-#include "kvm_util.h"
-#include "processor.h"
-#include "delay.h"
#include "arch_timer.h"
+#include "delay.h"
#include "gic.h"
+#include "processor.h"
+#include "timer_test.h"
#include "vgic.h"
-#define NR_VCPUS_DEF 4
-#define NR_TEST_ITERS_DEF 5
-#define TIMER_TEST_PERIOD_MS_DEF 10
-#define TIMER_TEST_ERR_MARGIN_US 100
-#define TIMER_TEST_MIGRATION_FREQ_MS 2
-
-struct test_args {
- int nr_vcpus;
- int nr_iter;
- int timer_period_ms;
- int migration_freq_ms;
- struct kvm_arm_counter_offset offset;
-};
-
-static struct test_args test_args = {
- .nr_vcpus = NR_VCPUS_DEF,
- .nr_iter = NR_TEST_ITERS_DEF,
- .timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
- .migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
- .offset = { .reserved = 1 },
-};
-
-#define msecs_to_usecs(msec) ((msec) * 1000LL)
-
#define GICD_BASE_GPA 0x8000000ULL
#define GICR_BASE_GPA 0x80A0000ULL
@@ -70,22 +25,8 @@ enum guest_stage {
GUEST_STAGE_MAX,
};
-/* Shared variables between host and guest */
-struct test_vcpu_shared_data {
- int nr_iter;
- enum guest_stage guest_stage;
- uint64_t xcnt;
-};
-
-static struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
-static pthread_t pt_vcpu_run[KVM_MAX_VCPUS];
-static struct test_vcpu_shared_data vcpu_shared_data[KVM_MAX_VCPUS];
-
static int vtimer_irq, ptimer_irq;
-static unsigned long *vcpu_done_map;
-static pthread_mutex_t vcpu_done_map_lock;
-
static void
guest_configure_timer_action(struct test_vcpu_shared_data *shared_data)
{
@@ -222,137 +163,6 @@ static void guest_code(void)
GUEST_DONE();
}
-static void *test_vcpu_run(void *arg)
-{
- unsigned int vcpu_idx = (unsigned long)arg;
- struct ucall uc;
- struct kvm_vcpu *vcpu = vcpus[vcpu_idx];
- struct kvm_vm *vm = vcpu->vm;
- struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[vcpu_idx];
-
- vcpu_run(vcpu);
-
- /* Currently, any exit from guest is an indication of completion */
- pthread_mutex_lock(&vcpu_done_map_lock);
- __set_bit(vcpu_idx, vcpu_done_map);
- pthread_mutex_unlock(&vcpu_done_map_lock);
-
- switch (get_ucall(vcpu, &uc)) {
- case UCALL_SYNC:
- case UCALL_DONE:
- break;
- case UCALL_ABORT:
- sync_global_from_guest(vm, *shared_data);
- fprintf(stderr, "Guest assert failed, vcpu %u; stage; %u; iter: %u\n",
- vcpu_idx, shared_data->guest_stage, shared_data->nr_iter);
- REPORT_GUEST_ASSERT(uc);
- break;
- default:
- TEST_FAIL("Unexpected guest exit\n");
- }
-
- return NULL;
-}
-
-static uint32_t test_get_pcpu(void)
-{
- uint32_t pcpu;
- unsigned int nproc_conf;
- cpu_set_t online_cpuset;
-
- nproc_conf = get_nprocs_conf();
- sched_getaffinity(0, sizeof(cpu_set_t), &online_cpuset);
-
- /* Randomly find an available pCPU to place a vCPU on */
- do {
- pcpu = rand() % nproc_conf;
- } while (!CPU_ISSET(pcpu, &online_cpuset));
-
- return pcpu;
-}
-
-static int test_migrate_vcpu(unsigned int vcpu_idx)
-{
- int ret;
- cpu_set_t cpuset;
- uint32_t new_pcpu = test_get_pcpu();
-
- CPU_ZERO(&cpuset);
- CPU_SET(new_pcpu, &cpuset);
-
- pr_debug("Migrating vCPU: %u to pCPU: %u\n", vcpu_idx, new_pcpu);
-
- ret = pthread_setaffinity_np(pt_vcpu_run[vcpu_idx],
- sizeof(cpuset), &cpuset);
-
- /* Allow the error where the vCPU thread is already finished */
- TEST_ASSERT(ret == 0 || ret == ESRCH,
- "Failed to migrate the vCPU:%u to pCPU: %u; ret: %d\n",
- vcpu_idx, new_pcpu, ret);
-
- return ret;
-}
-
-static void *test_vcpu_migration(void *arg)
-{
- unsigned int i, n_done;
- bool vcpu_done;
-
- do {
- usleep(msecs_to_usecs(test_args.migration_freq_ms));
-
- for (n_done = 0, i = 0; i < test_args.nr_vcpus; i++) {
- pthread_mutex_lock(&vcpu_done_map_lock);
- vcpu_done = test_bit(i, vcpu_done_map);
- pthread_mutex_unlock(&vcpu_done_map_lock);
-
- if (vcpu_done) {
- n_done++;
- continue;
- }
-
- test_migrate_vcpu(i);
- }
- } while (test_args.nr_vcpus != n_done);
-
- return NULL;
-}
-
-static void test_run(struct kvm_vm *vm)
-{
- pthread_t pt_vcpu_migration;
- unsigned int i;
- int ret;
-
- pthread_mutex_init(&vcpu_done_map_lock, NULL);
- vcpu_done_map = bitmap_zalloc(test_args.nr_vcpus);
- TEST_ASSERT(vcpu_done_map, "Failed to allocate vcpu done bitmap\n");
-
- for (i = 0; i < (unsigned long)test_args.nr_vcpus; i++) {
- ret = pthread_create(&pt_vcpu_run[i], NULL, test_vcpu_run,
- (void *)(unsigned long)i);
- TEST_ASSERT(!ret, "Failed to create vCPU-%d pthread\n", i);
- }
-
- /* Spawn a thread to control the vCPU migrations */
- if (test_args.migration_freq_ms) {
- srand(time(NULL));
-
- ret = pthread_create(&pt_vcpu_migration, NULL,
- test_vcpu_migration, NULL);
- TEST_ASSERT(!ret, "Failed to create the migration pthread\n");
- }
-
-
- for (i = 0; i < test_args.nr_vcpus; i++)
- pthread_join(pt_vcpu_run[i], NULL);
-
- if (test_args.migration_freq_ms)
- pthread_join(pt_vcpu_migration, NULL);
-
- bitmap_free(vcpu_done_map);
-}
-
static void test_init_timer_irq(struct kvm_vm *vm)
{
/* Timer initid should be same for all the vCPUs, so query only vCPU-0 */
@@ -369,7 +179,7 @@ static void test_init_timer_irq(struct kvm_vm *vm)
static int gic_fd;
-static struct kvm_vm *test_vm_create(void)
+struct kvm_vm *test_vm_create(void)
{
struct kvm_vm *vm;
unsigned int i;
@@ -400,81 +210,8 @@ static struct kvm_vm *test_vm_create(void)
return vm;
}
-static void test_vm_cleanup(struct kvm_vm *vm)
+void test_vm_cleanup(struct kvm_vm *vm)
{
close(gic_fd);
kvm_vm_free(vm);
}
-
-static void test_print_help(char *name)
-{
- pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
- name);
- pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
- NR_VCPUS_DEF, KVM_MAX_VCPUS);
- pr_info("\t-i: Number of iterations per stage (default: %u)\n",
- NR_TEST_ITERS_DEF);
- pr_info("\t-p: Periodicity (in ms) of the guest timer (default: %u)\n",
- TIMER_TEST_PERIOD_MS_DEF);
- pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
- TIMER_TEST_MIGRATION_FREQ_MS);
- pr_info("\t-o: Counter offset (in counter cycles, default: 0)\n");
- pr_info("\t-h: print this help screen\n");
-}
-
-static bool parse_args(int argc, char *argv[])
-{
- int opt;
-
- while ((opt = getopt(argc, argv, "hn:i:p:m:o:")) != -1) {
- switch (opt) {
- case 'n':
- test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
- if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
- pr_info("Max allowed vCPUs: %u\n",
- KVM_MAX_VCPUS);
- goto err;
- }
- break;
- case 'i':
- test_args.nr_iter = atoi_positive("Number of iterations", optarg);
- break;
- case 'p':
- test_args.timer_period_ms = atoi_positive("Periodicity", optarg);
- break;
- case 'm':
- test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
- break;
- case 'o':
- test_args.offset.counter_offset = strtol(optarg, NULL, 0);
- test_args.offset.reserved = 0;
- break;
- case 'h':
- default:
- goto err;
- }
- }
-
- return true;
-
-err:
- test_print_help(argv[0]);
- return false;
-}
-
-int main(int argc, char *argv[])
-{
- struct kvm_vm *vm;
-
- if (!parse_args(argc, argv))
- exit(KSFT_SKIP);
-
- __TEST_REQUIRE(!test_args.migration_freq_ms || get_nprocs() >= 2,
- "At least two physical CPUs needed for vCPU migration");
-
- vm = test_vm_create();
- test_run(vm);
- test_vm_cleanup(vm);
-
- return 0;
-}
diff --git a/tools/testing/selftests/kvm/arch_timer.c b/tools/testing/selftests/kvm/arch_timer.c
new file mode 100644
index 000000000000..6e442dbcfc8b
--- /dev/null
+++ b/tools/testing/selftests/kvm/arch_timer.c
@@ -0,0 +1,249 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch_timer.c - Tests the arch timer IRQ functionality
+ *
+ * The guest's main thread configures the timer interrupt and waits
+ * for it to fire, with a timeout equal to the timer period.
+ * It asserts that the timeout doesn't exceed the timer period plus
+ * an error margin of 100us.
+ *
+ * On the other hand, upon receipt of an interrupt, the guest's interrupt
+ * handler validates the interrupt by checking if the architectural state
+ * is in compliance with the specifications.
+ *
+ * The test provides command-line options to configure the timer's
+ * period (-p), number of vCPUs (-n), and iterations per stage (-i).
+ * To stress-test the timer stack even more, an option to migrate the
+ * vCPUs across pCPUs (-m), at a particular rate, is also provided.
+ *
+ * Copyright (c) 2021, Google LLC.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <pthread.h>
+#include <linux/sizes.h>
+#include <linux/bitmap.h>
+#include <sys/sysinfo.h>
+
+#include "timer_test.h"
+
+struct test_args test_args = {
+ .nr_vcpus = NR_VCPUS_DEF,
+ .nr_iter = NR_TEST_ITERS_DEF,
+ .timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
+ .migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
+ .offset = { .reserved = 1 },
+};
+
+struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
+struct test_vcpu_shared_data vcpu_shared_data[KVM_MAX_VCPUS];
+
+static pthread_t pt_vcpu_run[KVM_MAX_VCPUS];
+static unsigned long *vcpu_done_map;
+static pthread_mutex_t vcpu_done_map_lock;
+
+static void *test_vcpu_run(void *arg)
+{
+ unsigned int vcpu_idx = (unsigned long)arg;
+ struct ucall uc;
+ struct kvm_vcpu *vcpu = vcpus[vcpu_idx];
+ struct kvm_vm *vm = vcpu->vm;
+ struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[vcpu_idx];
+
+ vcpu_run(vcpu);
+
+ /* Currently, any exit from guest is an indication of completion */
+ pthread_mutex_lock(&vcpu_done_map_lock);
+ __set_bit(vcpu_idx, vcpu_done_map);
+ pthread_mutex_unlock(&vcpu_done_map_lock);
+
+ switch (get_ucall(vcpu, &uc)) {
+ case UCALL_SYNC:
+ case UCALL_DONE:
+ break;
+ case UCALL_ABORT:
+ sync_global_from_guest(vm, *shared_data);
+ fprintf(stderr, "Guest assert failed, vcpu %u; stage; %u; iter: %u\n",
+ vcpu_idx, shared_data->guest_stage, shared_data->nr_iter);
+ REPORT_GUEST_ASSERT(uc);
+ break;
+ default:
+ TEST_FAIL("Unexpected guest exit\n");
+ }
+
+ return NULL;
+}
+
+static uint32_t test_get_pcpu(void)
+{
+ uint32_t pcpu;
+ unsigned int nproc_conf;
+ cpu_set_t online_cpuset;
+
+ nproc_conf = get_nprocs_conf();
+ sched_getaffinity(0, sizeof(cpu_set_t), &online_cpuset);
+
+ /* Randomly find an available pCPU to place a vCPU on */
+ do {
+ pcpu = rand() % nproc_conf;
+ } while (!CPU_ISSET(pcpu, &online_cpuset));
+
+ return pcpu;
+}
+
+static int test_migrate_vcpu(unsigned int vcpu_idx)
+{
+ int ret;
+ cpu_set_t cpuset;
+ uint32_t new_pcpu = test_get_pcpu();
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(new_pcpu, &cpuset);
+
+ pr_debug("Migrating vCPU: %u to pCPU: %u\n", vcpu_idx, new_pcpu);
+
+ ret = pthread_setaffinity_np(pt_vcpu_run[vcpu_idx],
+ sizeof(cpuset), &cpuset);
+
+ /* Allow the error where the vCPU thread is already finished */
+ TEST_ASSERT(ret == 0 || ret == ESRCH,
+ "Failed to migrate the vCPU:%u to pCPU: %u; ret: %d\n",
+ vcpu_idx, new_pcpu, ret);
+
+ return ret;
+}
+
+static void *test_vcpu_migration(void *arg)
+{
+ unsigned int i, n_done;
+ bool vcpu_done;
+
+ do {
+ usleep(msecs_to_usecs(test_args.migration_freq_ms));
+
+ for (n_done = 0, i = 0; i < test_args.nr_vcpus; i++) {
+ pthread_mutex_lock(&vcpu_done_map_lock);
+ vcpu_done = test_bit(i, vcpu_done_map);
+ pthread_mutex_unlock(&vcpu_done_map_lock);
+
+ if (vcpu_done) {
+ n_done++;
+ continue;
+ }
+
+ test_migrate_vcpu(i);
+ }
+ } while (test_args.nr_vcpus != n_done);
+
+ return NULL;
+}
+
+static void test_run(struct kvm_vm *vm)
+{
+ pthread_t pt_vcpu_migration;
+ unsigned int i;
+ int ret;
+
+ pthread_mutex_init(&vcpu_done_map_lock, NULL);
+ vcpu_done_map = bitmap_zalloc(test_args.nr_vcpus);
+ TEST_ASSERT(vcpu_done_map, "Failed to allocate vcpu done bitmap\n");
+
+ for (i = 0; i < (unsigned long)test_args.nr_vcpus; i++) {
+ ret = pthread_create(&pt_vcpu_run[i], NULL, test_vcpu_run,
+ (void *)(unsigned long)i);
+ TEST_ASSERT(!ret, "Failed to create vCPU-%d pthread\n", i);
+ }
+
+ /* Spawn a thread to control the vCPU migrations */
+ if (test_args.migration_freq_ms) {
+ srand(time(NULL));
+
+ ret = pthread_create(&pt_vcpu_migration, NULL,
+ test_vcpu_migration, NULL);
+ TEST_ASSERT(!ret, "Failed to create the migration pthread\n");
+ }
+
+
+ for (i = 0; i < test_args.nr_vcpus; i++)
+ pthread_join(pt_vcpu_run[i], NULL);
+
+ if (test_args.migration_freq_ms)
+ pthread_join(pt_vcpu_migration, NULL);
+
+ bitmap_free(vcpu_done_map);
+}
+
+static void test_print_help(char *name)
+{
+ pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
+ name);
+ pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
+ NR_VCPUS_DEF, KVM_MAX_VCPUS);
+ pr_info("\t-i: Number of iterations per stage (default: %u)\n",
+ NR_TEST_ITERS_DEF);
+ pr_info("\t-p: Periodicity (in ms) of the guest timer (default: %u)\n",
+ TIMER_TEST_PERIOD_MS_DEF);
+ pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
+ TIMER_TEST_MIGRATION_FREQ_MS);
+ pr_info("\t-o: Counter offset (in counter cycles, default: 0)\n");
+ pr_info("\t-h: print this help screen\n");
+}
+
+static bool parse_args(int argc, char *argv[])
+{
+ int opt;
+
+ while ((opt = getopt(argc, argv, "hn:i:p:m:o:")) != -1) {
+ switch (opt) {
+ case 'n':
+ test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
+ if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
+ pr_info("Max allowed vCPUs: %u\n",
+ KVM_MAX_VCPUS);
+ goto err;
+ }
+ break;
+ case 'i':
+ test_args.nr_iter = atoi_positive("Number of iterations", optarg);
+ break;
+ case 'p':
+ test_args.timer_period_ms = atoi_positive("Periodicity", optarg);
+ break;
+ case 'm':
+ test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
+ break;
+ case 'o':
+ test_args.offset.counter_offset = strtol(optarg, NULL, 0);
+ test_args.offset.reserved = 0;
+ break;
+ case 'h':
+ default:
+ goto err;
+ }
+ }
+
+ return true;
+
+err:
+ test_print_help(argv[0]);
+ return false;
+}
+
+int main(int argc, char *argv[])
+{
+ struct kvm_vm *vm;
+
+ if (!parse_args(argc, argv))
+ exit(KSFT_SKIP);
+
+ __TEST_REQUIRE(!test_args.migration_freq_ms || get_nprocs() >= 2,
+ "At least two physical CPUs needed for vCPU migration");
+
+ vm = test_vm_create();
+ test_run(vm);
+ test_vm_cleanup(vm);
+
+ return 0;
+}
diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index 8e5f413a593d..36387e7ee8b2 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -20,6 +20,8 @@
#include <sys/mman.h>
#include "kselftest.h"
+#define msecs_to_usecs(msec) ((msec) * 1000LL)
+
static inline int _no_printf(const char *format, ...) { return 0; }
#ifdef DEBUG
diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
new file mode 100644
index 000000000000..2234c513b510
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/timer_test.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * timer test specific header
+ *
+ * Copyright (C) 2018, Google LLC
+ */
+
+#ifndef SELFTEST_KVM_TIMER_TEST_H
+#define SELFTEST_KVM_TIMER_TEST_H
+
+#include "kvm_util.h"
+
+#define NR_VCPUS_DEF 4
+#define NR_TEST_ITERS_DEF 5
+#define TIMER_TEST_PERIOD_MS_DEF 10
+#define TIMER_TEST_ERR_MARGIN_US 100
+#define TIMER_TEST_MIGRATION_FREQ_MS 2
+
+/* Timer test cmdline parameters */
+struct test_args {
+ int nr_vcpus;
+ int nr_iter;
+ int timer_period_ms;
+ int migration_freq_ms;
+ /* TODO: Change arm specific type to a common one */
+ struct kvm_arm_counter_offset offset;
+};
+
+/* Shared variables between host and guest */
+struct test_vcpu_shared_data {
+ int nr_iter;
+ int guest_stage;
+ uint64_t xcnt;
+};
+
+extern struct test_args test_args;
+extern struct kvm_vcpu *vcpus[];
+extern struct test_vcpu_shared_data vcpu_shared_data[];
+
+struct kvm_vm *test_vm_create(void);
+void test_vm_cleanup(struct kvm_vm *vm);
+
+#endif /* SELFTEST_KVM_TIMER_TEST_H */
--
2.34.1
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^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v4 02/11] KVM: arm64: selftests: Split arch_timer test code
2023-12-12 9:31 ` [PATCH v4 02/11] KVM: arm64: selftests: Split arch_timer test code Haibo Xu
@ 2023-12-14 6:41 ` Anup Patel
0 siblings, 0 replies; 28+ messages in thread
From: Anup Patel @ 2023-12-14 6:41 UTC (permalink / raw)
To: Marc Zyngier, Oliver Upton
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, James Morse,
Suzuki K Poulose, Zenghui Yu, Atish Patra, Guo Ren, Conor Dooley,
Mayuresh Chitale, Greentime Hu, Heiko Stuebner, Samuel Holland,
Minda Chen, Jisheng Zhang, Sean Christopherson, Peter Xu, Like Xu,
Vipin Sharma, Maciej Wieczor-Retman, Thomas Huth, Aaron Lewis,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
Hi Marc, Hi Oliver,
On Tue, Dec 12, 2023 at 2:49 PM Haibo Xu <haibo1.xu@intel.com> wrote:
>
> Split the arch-neutral test code out of aarch64/arch_timer.c
> and put them into a common arch_timer.c. This is a preparation
> to share timer test codes in riscv.
>
> Suggested-by: Andrew Jones <ajones@ventanamicro.com>
> Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Can you please review this patch ?
We want to take this entire series through KVM RISC-V tree.
Regards,
Anup
> ---
> tools/testing/selftests/kvm/Makefile | 3 +-
> .../selftests/kvm/aarch64/arch_timer.c | 275 +-----------------
> tools/testing/selftests/kvm/arch_timer.c | 249 ++++++++++++++++
> .../testing/selftests/kvm/include/test_util.h | 2 +
> .../selftests/kvm/include/timer_test.h | 43 +++
> 5 files changed, 302 insertions(+), 270 deletions(-)
> create mode 100644 tools/testing/selftests/kvm/arch_timer.c
> create mode 100644 tools/testing/selftests/kvm/include/timer_test.h
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 2200f06b740b..4838ea899bbb 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -151,7 +151,6 @@ TEST_GEN_PROGS_x86_64 += system_counter_offset_test
> TEST_GEN_PROGS_EXTENDED_x86_64 += x86_64/nx_huge_pages_test
>
> TEST_GEN_PROGS_aarch64 += aarch64/aarch32_id_regs
> -TEST_GEN_PROGS_aarch64 += aarch64/arch_timer
> TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions
> TEST_GEN_PROGS_aarch64 += aarch64/hypercalls
> TEST_GEN_PROGS_aarch64 += aarch64/page_fault_test
> @@ -163,6 +162,7 @@ TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
> TEST_GEN_PROGS_aarch64 += aarch64/vgic_irq
> TEST_GEN_PROGS_aarch64 += aarch64/vpmu_counter_access
> TEST_GEN_PROGS_aarch64 += access_tracking_perf_test
> +TEST_GEN_PROGS_aarch64 += arch_timer
> TEST_GEN_PROGS_aarch64 += demand_paging_test
> TEST_GEN_PROGS_aarch64 += dirty_log_test
> TEST_GEN_PROGS_aarch64 += dirty_log_perf_test
> @@ -201,6 +201,7 @@ TEST_GEN_PROGS_riscv += kvm_page_table_test
> TEST_GEN_PROGS_riscv += set_memory_region_test
> TEST_GEN_PROGS_riscv += kvm_binary_stats_test
>
> +SPLIT_TESTS += arch_timer
> SPLIT_TESTS += get-reg-list
>
> TEST_PROGS += $(TEST_PROGS_$(ARCH_DIR))
> diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
> index 274b8465b42a..6fb47ba07e5b 100644
> --- a/tools/testing/selftests/kvm/aarch64/arch_timer.c
> +++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
> @@ -1,64 +1,19 @@
> // SPDX-License-Identifier: GPL-2.0-only
> /*
> - * arch_timer.c - Tests the aarch64 timer IRQ functionality
> - *
> * The test validates both the virtual and physical timer IRQs using
> - * CVAL and TVAL registers. This consitutes the four stages in the test.
> - * The guest's main thread configures the timer interrupt for a stage
> - * and waits for it to fire, with a timeout equal to the timer period.
> - * It asserts that the timeout doesn't exceed the timer period.
> - *
> - * On the other hand, upon receipt of an interrupt, the guest's interrupt
> - * handler validates the interrupt by checking if the architectural state
> - * is in compliance with the specifications.
> - *
> - * The test provides command-line options to configure the timer's
> - * period (-p), number of vCPUs (-n), and iterations per stage (-i).
> - * To stress-test the timer stack even more, an option to migrate the
> - * vCPUs across pCPUs (-m), at a particular rate, is also provided.
> + * CVAL and TVAL registers.
> *
> * Copyright (c) 2021, Google LLC.
> */
> #define _GNU_SOURCE
>
> -#include <stdlib.h>
> -#include <pthread.h>
> -#include <linux/kvm.h>
> -#include <linux/sizes.h>
> -#include <linux/bitmap.h>
> -#include <sys/sysinfo.h>
> -
> -#include "kvm_util.h"
> -#include "processor.h"
> -#include "delay.h"
> #include "arch_timer.h"
> +#include "delay.h"
> #include "gic.h"
> +#include "processor.h"
> +#include "timer_test.h"
> #include "vgic.h"
>
> -#define NR_VCPUS_DEF 4
> -#define NR_TEST_ITERS_DEF 5
> -#define TIMER_TEST_PERIOD_MS_DEF 10
> -#define TIMER_TEST_ERR_MARGIN_US 100
> -#define TIMER_TEST_MIGRATION_FREQ_MS 2
> -
> -struct test_args {
> - int nr_vcpus;
> - int nr_iter;
> - int timer_period_ms;
> - int migration_freq_ms;
> - struct kvm_arm_counter_offset offset;
> -};
> -
> -static struct test_args test_args = {
> - .nr_vcpus = NR_VCPUS_DEF,
> - .nr_iter = NR_TEST_ITERS_DEF,
> - .timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
> - .migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
> - .offset = { .reserved = 1 },
> -};
> -
> -#define msecs_to_usecs(msec) ((msec) * 1000LL)
> -
> #define GICD_BASE_GPA 0x8000000ULL
> #define GICR_BASE_GPA 0x80A0000ULL
>
> @@ -70,22 +25,8 @@ enum guest_stage {
> GUEST_STAGE_MAX,
> };
>
> -/* Shared variables between host and guest */
> -struct test_vcpu_shared_data {
> - int nr_iter;
> - enum guest_stage guest_stage;
> - uint64_t xcnt;
> -};
> -
> -static struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
> -static pthread_t pt_vcpu_run[KVM_MAX_VCPUS];
> -static struct test_vcpu_shared_data vcpu_shared_data[KVM_MAX_VCPUS];
> -
> static int vtimer_irq, ptimer_irq;
>
> -static unsigned long *vcpu_done_map;
> -static pthread_mutex_t vcpu_done_map_lock;
> -
> static void
> guest_configure_timer_action(struct test_vcpu_shared_data *shared_data)
> {
> @@ -222,137 +163,6 @@ static void guest_code(void)
> GUEST_DONE();
> }
>
> -static void *test_vcpu_run(void *arg)
> -{
> - unsigned int vcpu_idx = (unsigned long)arg;
> - struct ucall uc;
> - struct kvm_vcpu *vcpu = vcpus[vcpu_idx];
> - struct kvm_vm *vm = vcpu->vm;
> - struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[vcpu_idx];
> -
> - vcpu_run(vcpu);
> -
> - /* Currently, any exit from guest is an indication of completion */
> - pthread_mutex_lock(&vcpu_done_map_lock);
> - __set_bit(vcpu_idx, vcpu_done_map);
> - pthread_mutex_unlock(&vcpu_done_map_lock);
> -
> - switch (get_ucall(vcpu, &uc)) {
> - case UCALL_SYNC:
> - case UCALL_DONE:
> - break;
> - case UCALL_ABORT:
> - sync_global_from_guest(vm, *shared_data);
> - fprintf(stderr, "Guest assert failed, vcpu %u; stage; %u; iter: %u\n",
> - vcpu_idx, shared_data->guest_stage, shared_data->nr_iter);
> - REPORT_GUEST_ASSERT(uc);
> - break;
> - default:
> - TEST_FAIL("Unexpected guest exit\n");
> - }
> -
> - return NULL;
> -}
> -
> -static uint32_t test_get_pcpu(void)
> -{
> - uint32_t pcpu;
> - unsigned int nproc_conf;
> - cpu_set_t online_cpuset;
> -
> - nproc_conf = get_nprocs_conf();
> - sched_getaffinity(0, sizeof(cpu_set_t), &online_cpuset);
> -
> - /* Randomly find an available pCPU to place a vCPU on */
> - do {
> - pcpu = rand() % nproc_conf;
> - } while (!CPU_ISSET(pcpu, &online_cpuset));
> -
> - return pcpu;
> -}
> -
> -static int test_migrate_vcpu(unsigned int vcpu_idx)
> -{
> - int ret;
> - cpu_set_t cpuset;
> - uint32_t new_pcpu = test_get_pcpu();
> -
> - CPU_ZERO(&cpuset);
> - CPU_SET(new_pcpu, &cpuset);
> -
> - pr_debug("Migrating vCPU: %u to pCPU: %u\n", vcpu_idx, new_pcpu);
> -
> - ret = pthread_setaffinity_np(pt_vcpu_run[vcpu_idx],
> - sizeof(cpuset), &cpuset);
> -
> - /* Allow the error where the vCPU thread is already finished */
> - TEST_ASSERT(ret == 0 || ret == ESRCH,
> - "Failed to migrate the vCPU:%u to pCPU: %u; ret: %d\n",
> - vcpu_idx, new_pcpu, ret);
> -
> - return ret;
> -}
> -
> -static void *test_vcpu_migration(void *arg)
> -{
> - unsigned int i, n_done;
> - bool vcpu_done;
> -
> - do {
> - usleep(msecs_to_usecs(test_args.migration_freq_ms));
> -
> - for (n_done = 0, i = 0; i < test_args.nr_vcpus; i++) {
> - pthread_mutex_lock(&vcpu_done_map_lock);
> - vcpu_done = test_bit(i, vcpu_done_map);
> - pthread_mutex_unlock(&vcpu_done_map_lock);
> -
> - if (vcpu_done) {
> - n_done++;
> - continue;
> - }
> -
> - test_migrate_vcpu(i);
> - }
> - } while (test_args.nr_vcpus != n_done);
> -
> - return NULL;
> -}
> -
> -static void test_run(struct kvm_vm *vm)
> -{
> - pthread_t pt_vcpu_migration;
> - unsigned int i;
> - int ret;
> -
> - pthread_mutex_init(&vcpu_done_map_lock, NULL);
> - vcpu_done_map = bitmap_zalloc(test_args.nr_vcpus);
> - TEST_ASSERT(vcpu_done_map, "Failed to allocate vcpu done bitmap\n");
> -
> - for (i = 0; i < (unsigned long)test_args.nr_vcpus; i++) {
> - ret = pthread_create(&pt_vcpu_run[i], NULL, test_vcpu_run,
> - (void *)(unsigned long)i);
> - TEST_ASSERT(!ret, "Failed to create vCPU-%d pthread\n", i);
> - }
> -
> - /* Spawn a thread to control the vCPU migrations */
> - if (test_args.migration_freq_ms) {
> - srand(time(NULL));
> -
> - ret = pthread_create(&pt_vcpu_migration, NULL,
> - test_vcpu_migration, NULL);
> - TEST_ASSERT(!ret, "Failed to create the migration pthread\n");
> - }
> -
> -
> - for (i = 0; i < test_args.nr_vcpus; i++)
> - pthread_join(pt_vcpu_run[i], NULL);
> -
> - if (test_args.migration_freq_ms)
> - pthread_join(pt_vcpu_migration, NULL);
> -
> - bitmap_free(vcpu_done_map);
> -}
> -
> static void test_init_timer_irq(struct kvm_vm *vm)
> {
> /* Timer initid should be same for all the vCPUs, so query only vCPU-0 */
> @@ -369,7 +179,7 @@ static void test_init_timer_irq(struct kvm_vm *vm)
>
> static int gic_fd;
>
> -static struct kvm_vm *test_vm_create(void)
> +struct kvm_vm *test_vm_create(void)
> {
> struct kvm_vm *vm;
> unsigned int i;
> @@ -400,81 +210,8 @@ static struct kvm_vm *test_vm_create(void)
> return vm;
> }
>
> -static void test_vm_cleanup(struct kvm_vm *vm)
> +void test_vm_cleanup(struct kvm_vm *vm)
> {
> close(gic_fd);
> kvm_vm_free(vm);
> }
> -
> -static void test_print_help(char *name)
> -{
> - pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
> - name);
> - pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
> - NR_VCPUS_DEF, KVM_MAX_VCPUS);
> - pr_info("\t-i: Number of iterations per stage (default: %u)\n",
> - NR_TEST_ITERS_DEF);
> - pr_info("\t-p: Periodicity (in ms) of the guest timer (default: %u)\n",
> - TIMER_TEST_PERIOD_MS_DEF);
> - pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
> - TIMER_TEST_MIGRATION_FREQ_MS);
> - pr_info("\t-o: Counter offset (in counter cycles, default: 0)\n");
> - pr_info("\t-h: print this help screen\n");
> -}
> -
> -static bool parse_args(int argc, char *argv[])
> -{
> - int opt;
> -
> - while ((opt = getopt(argc, argv, "hn:i:p:m:o:")) != -1) {
> - switch (opt) {
> - case 'n':
> - test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
> - if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
> - pr_info("Max allowed vCPUs: %u\n",
> - KVM_MAX_VCPUS);
> - goto err;
> - }
> - break;
> - case 'i':
> - test_args.nr_iter = atoi_positive("Number of iterations", optarg);
> - break;
> - case 'p':
> - test_args.timer_period_ms = atoi_positive("Periodicity", optarg);
> - break;
> - case 'm':
> - test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
> - break;
> - case 'o':
> - test_args.offset.counter_offset = strtol(optarg, NULL, 0);
> - test_args.offset.reserved = 0;
> - break;
> - case 'h':
> - default:
> - goto err;
> - }
> - }
> -
> - return true;
> -
> -err:
> - test_print_help(argv[0]);
> - return false;
> -}
> -
> -int main(int argc, char *argv[])
> -{
> - struct kvm_vm *vm;
> -
> - if (!parse_args(argc, argv))
> - exit(KSFT_SKIP);
> -
> - __TEST_REQUIRE(!test_args.migration_freq_ms || get_nprocs() >= 2,
> - "At least two physical CPUs needed for vCPU migration");
> -
> - vm = test_vm_create();
> - test_run(vm);
> - test_vm_cleanup(vm);
> -
> - return 0;
> -}
> diff --git a/tools/testing/selftests/kvm/arch_timer.c b/tools/testing/selftests/kvm/arch_timer.c
> new file mode 100644
> index 000000000000..6e442dbcfc8b
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/arch_timer.c
> @@ -0,0 +1,249 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * arch_timer.c - Tests the arch timer IRQ functionality
> + *
> + * The guest's main thread configures the timer interrupt and waits
> + * for it to fire, with a timeout equal to the timer period.
> + * It asserts that the timeout doesn't exceed the timer period plus
> + * an error margin of 100us.
> + *
> + * On the other hand, upon receipt of an interrupt, the guest's interrupt
> + * handler validates the interrupt by checking if the architectural state
> + * is in compliance with the specifications.
> + *
> + * The test provides command-line options to configure the timer's
> + * period (-p), number of vCPUs (-n), and iterations per stage (-i).
> + * To stress-test the timer stack even more, an option to migrate the
> + * vCPUs across pCPUs (-m), at a particular rate, is also provided.
> + *
> + * Copyright (c) 2021, Google LLC.
> + */
> +
> +#define _GNU_SOURCE
> +
> +#include <stdlib.h>
> +#include <pthread.h>
> +#include <linux/sizes.h>
> +#include <linux/bitmap.h>
> +#include <sys/sysinfo.h>
> +
> +#include "timer_test.h"
> +
> +struct test_args test_args = {
> + .nr_vcpus = NR_VCPUS_DEF,
> + .nr_iter = NR_TEST_ITERS_DEF,
> + .timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
> + .migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
> + .offset = { .reserved = 1 },
> +};
> +
> +struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
> +struct test_vcpu_shared_data vcpu_shared_data[KVM_MAX_VCPUS];
> +
> +static pthread_t pt_vcpu_run[KVM_MAX_VCPUS];
> +static unsigned long *vcpu_done_map;
> +static pthread_mutex_t vcpu_done_map_lock;
> +
> +static void *test_vcpu_run(void *arg)
> +{
> + unsigned int vcpu_idx = (unsigned long)arg;
> + struct ucall uc;
> + struct kvm_vcpu *vcpu = vcpus[vcpu_idx];
> + struct kvm_vm *vm = vcpu->vm;
> + struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[vcpu_idx];
> +
> + vcpu_run(vcpu);
> +
> + /* Currently, any exit from guest is an indication of completion */
> + pthread_mutex_lock(&vcpu_done_map_lock);
> + __set_bit(vcpu_idx, vcpu_done_map);
> + pthread_mutex_unlock(&vcpu_done_map_lock);
> +
> + switch (get_ucall(vcpu, &uc)) {
> + case UCALL_SYNC:
> + case UCALL_DONE:
> + break;
> + case UCALL_ABORT:
> + sync_global_from_guest(vm, *shared_data);
> + fprintf(stderr, "Guest assert failed, vcpu %u; stage; %u; iter: %u\n",
> + vcpu_idx, shared_data->guest_stage, shared_data->nr_iter);
> + REPORT_GUEST_ASSERT(uc);
> + break;
> + default:
> + TEST_FAIL("Unexpected guest exit\n");
> + }
> +
> + return NULL;
> +}
> +
> +static uint32_t test_get_pcpu(void)
> +{
> + uint32_t pcpu;
> + unsigned int nproc_conf;
> + cpu_set_t online_cpuset;
> +
> + nproc_conf = get_nprocs_conf();
> + sched_getaffinity(0, sizeof(cpu_set_t), &online_cpuset);
> +
> + /* Randomly find an available pCPU to place a vCPU on */
> + do {
> + pcpu = rand() % nproc_conf;
> + } while (!CPU_ISSET(pcpu, &online_cpuset));
> +
> + return pcpu;
> +}
> +
> +static int test_migrate_vcpu(unsigned int vcpu_idx)
> +{
> + int ret;
> + cpu_set_t cpuset;
> + uint32_t new_pcpu = test_get_pcpu();
> +
> + CPU_ZERO(&cpuset);
> + CPU_SET(new_pcpu, &cpuset);
> +
> + pr_debug("Migrating vCPU: %u to pCPU: %u\n", vcpu_idx, new_pcpu);
> +
> + ret = pthread_setaffinity_np(pt_vcpu_run[vcpu_idx],
> + sizeof(cpuset), &cpuset);
> +
> + /* Allow the error where the vCPU thread is already finished */
> + TEST_ASSERT(ret == 0 || ret == ESRCH,
> + "Failed to migrate the vCPU:%u to pCPU: %u; ret: %d\n",
> + vcpu_idx, new_pcpu, ret);
> +
> + return ret;
> +}
> +
> +static void *test_vcpu_migration(void *arg)
> +{
> + unsigned int i, n_done;
> + bool vcpu_done;
> +
> + do {
> + usleep(msecs_to_usecs(test_args.migration_freq_ms));
> +
> + for (n_done = 0, i = 0; i < test_args.nr_vcpus; i++) {
> + pthread_mutex_lock(&vcpu_done_map_lock);
> + vcpu_done = test_bit(i, vcpu_done_map);
> + pthread_mutex_unlock(&vcpu_done_map_lock);
> +
> + if (vcpu_done) {
> + n_done++;
> + continue;
> + }
> +
> + test_migrate_vcpu(i);
> + }
> + } while (test_args.nr_vcpus != n_done);
> +
> + return NULL;
> +}
> +
> +static void test_run(struct kvm_vm *vm)
> +{
> + pthread_t pt_vcpu_migration;
> + unsigned int i;
> + int ret;
> +
> + pthread_mutex_init(&vcpu_done_map_lock, NULL);
> + vcpu_done_map = bitmap_zalloc(test_args.nr_vcpus);
> + TEST_ASSERT(vcpu_done_map, "Failed to allocate vcpu done bitmap\n");
> +
> + for (i = 0; i < (unsigned long)test_args.nr_vcpus; i++) {
> + ret = pthread_create(&pt_vcpu_run[i], NULL, test_vcpu_run,
> + (void *)(unsigned long)i);
> + TEST_ASSERT(!ret, "Failed to create vCPU-%d pthread\n", i);
> + }
> +
> + /* Spawn a thread to control the vCPU migrations */
> + if (test_args.migration_freq_ms) {
> + srand(time(NULL));
> +
> + ret = pthread_create(&pt_vcpu_migration, NULL,
> + test_vcpu_migration, NULL);
> + TEST_ASSERT(!ret, "Failed to create the migration pthread\n");
> + }
> +
> +
> + for (i = 0; i < test_args.nr_vcpus; i++)
> + pthread_join(pt_vcpu_run[i], NULL);
> +
> + if (test_args.migration_freq_ms)
> + pthread_join(pt_vcpu_migration, NULL);
> +
> + bitmap_free(vcpu_done_map);
> +}
> +
> +static void test_print_help(char *name)
> +{
> + pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
> + name);
> + pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
> + NR_VCPUS_DEF, KVM_MAX_VCPUS);
> + pr_info("\t-i: Number of iterations per stage (default: %u)\n",
> + NR_TEST_ITERS_DEF);
> + pr_info("\t-p: Periodicity (in ms) of the guest timer (default: %u)\n",
> + TIMER_TEST_PERIOD_MS_DEF);
> + pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
> + TIMER_TEST_MIGRATION_FREQ_MS);
> + pr_info("\t-o: Counter offset (in counter cycles, default: 0)\n");
> + pr_info("\t-h: print this help screen\n");
> +}
> +
> +static bool parse_args(int argc, char *argv[])
> +{
> + int opt;
> +
> + while ((opt = getopt(argc, argv, "hn:i:p:m:o:")) != -1) {
> + switch (opt) {
> + case 'n':
> + test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
> + if (test_args.nr_vcpus > KVM_MAX_VCPUS) {
> + pr_info("Max allowed vCPUs: %u\n",
> + KVM_MAX_VCPUS);
> + goto err;
> + }
> + break;
> + case 'i':
> + test_args.nr_iter = atoi_positive("Number of iterations", optarg);
> + break;
> + case 'p':
> + test_args.timer_period_ms = atoi_positive("Periodicity", optarg);
> + break;
> + case 'm':
> + test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
> + break;
> + case 'o':
> + test_args.offset.counter_offset = strtol(optarg, NULL, 0);
> + test_args.offset.reserved = 0;
> + break;
> + case 'h':
> + default:
> + goto err;
> + }
> + }
> +
> + return true;
> +
> +err:
> + test_print_help(argv[0]);
> + return false;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + struct kvm_vm *vm;
> +
> + if (!parse_args(argc, argv))
> + exit(KSFT_SKIP);
> +
> + __TEST_REQUIRE(!test_args.migration_freq_ms || get_nprocs() >= 2,
> + "At least two physical CPUs needed for vCPU migration");
> +
> + vm = test_vm_create();
> + test_run(vm);
> + test_vm_cleanup(vm);
> +
> + return 0;
> +}
> diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
> index 8e5f413a593d..36387e7ee8b2 100644
> --- a/tools/testing/selftests/kvm/include/test_util.h
> +++ b/tools/testing/selftests/kvm/include/test_util.h
> @@ -20,6 +20,8 @@
> #include <sys/mman.h>
> #include "kselftest.h"
>
> +#define msecs_to_usecs(msec) ((msec) * 1000LL)
> +
> static inline int _no_printf(const char *format, ...) { return 0; }
>
> #ifdef DEBUG
> diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> new file mode 100644
> index 000000000000..2234c513b510
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/include/timer_test.h
> @@ -0,0 +1,43 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * timer test specific header
> + *
> + * Copyright (C) 2018, Google LLC
> + */
> +
> +#ifndef SELFTEST_KVM_TIMER_TEST_H
> +#define SELFTEST_KVM_TIMER_TEST_H
> +
> +#include "kvm_util.h"
> +
> +#define NR_VCPUS_DEF 4
> +#define NR_TEST_ITERS_DEF 5
> +#define TIMER_TEST_PERIOD_MS_DEF 10
> +#define TIMER_TEST_ERR_MARGIN_US 100
> +#define TIMER_TEST_MIGRATION_FREQ_MS 2
> +
> +/* Timer test cmdline parameters */
> +struct test_args {
> + int nr_vcpus;
> + int nr_iter;
> + int timer_period_ms;
> + int migration_freq_ms;
> + /* TODO: Change arm specific type to a common one */
> + struct kvm_arm_counter_offset offset;
> +};
> +
> +/* Shared variables between host and guest */
> +struct test_vcpu_shared_data {
> + int nr_iter;
> + int guest_stage;
> + uint64_t xcnt;
> +};
> +
> +extern struct test_args test_args;
> +extern struct kvm_vcpu *vcpus[];
> +extern struct test_vcpu_shared_data vcpu_shared_data[];
> +
> +struct kvm_vm *test_vm_create(void);
> +void test_vm_cleanup(struct kvm_vm *vm);
> +
> +#endif /* SELFTEST_KVM_TIMER_TEST_H */
> --
> 2.34.1
>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v4 03/11] KVM: selftests: Add CONFIG_64BIT definition for the build
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
2023-12-12 9:31 ` [PATCH v4 01/11] selftests/kvm: Fix issues with $(SPLIT_TESTS) Haibo Xu
2023-12-12 9:31 ` [PATCH v4 02/11] KVM: arm64: selftests: Split arch_timer test code Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-13 13:52 ` Andrew Jones
2023-12-12 9:31 ` [PATCH v4 04/11] tools: riscv: Add header file csr.h Haibo Xu
` (7 subsequent siblings)
10 siblings, 1 reply; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale,
Greentime Hu, wchen, Jisheng Zhang, Samuel Holland, Minda Chen,
Sean Christopherson, Like Xu, Peter Xu, Vipin Sharma, Thomas Huth,
Aaron Lewis, Maciej Wieczor-Retman, linux-kernel, linux-riscv,
kvm, linux-kselftest, linux-arm-kernel, kvmarm, kvm-riscv
Since only 64bit KVM selftests were supported on all architectures,
add the CONFIG_64BIT definition in kvm/Makefile to ensure only 64bit
definitions were available in the corresponding included files.
Suggested-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
---
tools/testing/selftests/kvm/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 4838ea899bbb..bb03e278a163 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -225,7 +225,7 @@ else
LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
endif
CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
- -Wno-gnu-variable-sized-type-not-at-end -MD\
+ -Wno-gnu-variable-sized-type-not-at-end -MD -DCONFIG_64BIT \
-fno-builtin-memcmp -fno-builtin-memcpy -fno-builtin-memset \
-fno-builtin-strnlen \
-fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \
--
2.34.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v4 03/11] KVM: selftests: Add CONFIG_64BIT definition for the build
2023-12-12 9:31 ` [PATCH v4 03/11] KVM: selftests: Add CONFIG_64BIT definition for the build Haibo Xu
@ 2023-12-13 13:52 ` Andrew Jones
0 siblings, 0 replies; 28+ messages in thread
From: Andrew Jones @ 2023-12-13 13:52 UTC (permalink / raw)
To: Haibo Xu
Cc: xiaobo55x, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale,
Greentime Hu, wchen, Jisheng Zhang, Samuel Holland, Minda Chen,
Sean Christopherson, Like Xu, Peter Xu, Vipin Sharma, Thomas Huth,
Aaron Lewis, Maciej Wieczor-Retman, linux-kernel, linux-riscv,
kvm, linux-kselftest, linux-arm-kernel, kvmarm, kvm-riscv
On Tue, Dec 12, 2023 at 05:31:12PM +0800, Haibo Xu wrote:
> Since only 64bit KVM selftests were supported on all architectures,
> add the CONFIG_64BIT definition in kvm/Makefile to ensure only 64bit
> definitions were available in the corresponding included files.
>
> Suggested-by: Andrew Jones <ajones@ventanamicro.com>
> Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
> ---
> tools/testing/selftests/kvm/Makefile | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 4838ea899bbb..bb03e278a163 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -225,7 +225,7 @@ else
> LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
> endif
> CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
> - -Wno-gnu-variable-sized-type-not-at-end -MD\
> + -Wno-gnu-variable-sized-type-not-at-end -MD -DCONFIG_64BIT \
> -fno-builtin-memcmp -fno-builtin-memcpy -fno-builtin-memset \
> -fno-builtin-strnlen \
> -fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \
> --
> 2.34.1
>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v4 04/11] tools: riscv: Add header file csr.h
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
` (2 preceding siblings ...)
2023-12-12 9:31 ` [PATCH v4 03/11] KVM: selftests: Add CONFIG_64BIT definition for the build Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-12 9:31 ` [PATCH v4 05/11] tools: riscv: Add header file vdso/processor.h Haibo Xu
` (6 subsequent siblings)
10 siblings, 0 replies; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale, wchen,
Daniel Henrique Barboza, Heiko Stuebner, Minda Chen,
Samuel Holland, Jisheng Zhang, Sean Christopherson, Like Xu,
Peter Xu, Vipin Sharma, Thomas Huth, Maciej Wieczor-Retman,
Aaron Lewis, linux-kernel, linux-riscv, kvm, linux-kselftest,
linux-arm-kernel, kvmarm, kvm-riscv
Borrow the csr definitions and operations from kernel's
arch/riscv/include/asm/csr.h to tools/ for riscv.
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
tools/arch/riscv/include/asm/csr.h | 521 +++++++++++++++++++++++++++++
1 file changed, 521 insertions(+)
create mode 100644 tools/arch/riscv/include/asm/csr.h
diff --git a/tools/arch/riscv/include/asm/csr.h b/tools/arch/riscv/include/asm/csr.h
new file mode 100644
index 000000000000..4e86c82aacbd
--- /dev/null
+++ b/tools/arch/riscv/include/asm/csr.h
@@ -0,0 +1,521 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2015 Regents of the University of California
+ */
+
+#ifndef _ASM_RISCV_CSR_H
+#define _ASM_RISCV_CSR_H
+
+#include <linux/bits.h>
+
+/* Status register flags */
+#define SR_SIE _AC(0x00000002, UL) /* Supervisor Interrupt Enable */
+#define SR_MIE _AC(0x00000008, UL) /* Machine Interrupt Enable */
+#define SR_SPIE _AC(0x00000020, UL) /* Previous Supervisor IE */
+#define SR_MPIE _AC(0x00000080, UL) /* Previous Machine IE */
+#define SR_SPP _AC(0x00000100, UL) /* Previously Supervisor */
+#define SR_MPP _AC(0x00001800, UL) /* Previously Machine */
+#define SR_SUM _AC(0x00040000, UL) /* Supervisor User Memory Access */
+
+#define SR_FS _AC(0x00006000, UL) /* Floating-point Status */
+#define SR_FS_OFF _AC(0x00000000, UL)
+#define SR_FS_INITIAL _AC(0x00002000, UL)
+#define SR_FS_CLEAN _AC(0x00004000, UL)
+#define SR_FS_DIRTY _AC(0x00006000, UL)
+
+#define SR_VS _AC(0x00000600, UL) /* Vector Status */
+#define SR_VS_OFF _AC(0x00000000, UL)
+#define SR_VS_INITIAL _AC(0x00000200, UL)
+#define SR_VS_CLEAN _AC(0x00000400, UL)
+#define SR_VS_DIRTY _AC(0x00000600, UL)
+
+#define SR_XS _AC(0x00018000, UL) /* Extension Status */
+#define SR_XS_OFF _AC(0x00000000, UL)
+#define SR_XS_INITIAL _AC(0x00008000, UL)
+#define SR_XS_CLEAN _AC(0x00010000, UL)
+#define SR_XS_DIRTY _AC(0x00018000, UL)
+
+#define SR_FS_VS (SR_FS | SR_VS) /* Vector and Floating-Point Unit */
+
+#ifndef CONFIG_64BIT
+#define SR_SD _AC(0x80000000, UL) /* FS/VS/XS dirty */
+#else
+#define SR_SD _AC(0x8000000000000000, UL) /* FS/VS/XS dirty */
+#endif
+
+#ifdef CONFIG_64BIT
+#define SR_UXL _AC(0x300000000, UL) /* XLEN mask for U-mode */
+#define SR_UXL_32 _AC(0x100000000, UL) /* XLEN = 32 for U-mode */
+#define SR_UXL_64 _AC(0x200000000, UL) /* XLEN = 64 for U-mode */
+#endif
+
+/* SATP flags */
+#ifndef CONFIG_64BIT
+#define SATP_PPN _AC(0x003FFFFF, UL)
+#define SATP_MODE_32 _AC(0x80000000, UL)
+#define SATP_ASID_BITS 9
+#define SATP_ASID_SHIFT 22
+#define SATP_ASID_MASK _AC(0x1FF, UL)
+#else
+#define SATP_PPN _AC(0x00000FFFFFFFFFFF, UL)
+#define SATP_MODE_39 _AC(0x8000000000000000, UL)
+#define SATP_MODE_48 _AC(0x9000000000000000, UL)
+#define SATP_MODE_57 _AC(0xa000000000000000, UL)
+#define SATP_ASID_BITS 16
+#define SATP_ASID_SHIFT 44
+#define SATP_ASID_MASK _AC(0xFFFF, UL)
+#endif
+
+/* Exception cause high bit - is an interrupt if set */
+#define CAUSE_IRQ_FLAG (_AC(1, UL) << (__riscv_xlen - 1))
+
+/* Interrupt causes (minus the high bit) */
+#define IRQ_S_SOFT 1
+#define IRQ_VS_SOFT 2
+#define IRQ_M_SOFT 3
+#define IRQ_S_TIMER 5
+#define IRQ_VS_TIMER 6
+#define IRQ_M_TIMER 7
+#define IRQ_S_EXT 9
+#define IRQ_VS_EXT 10
+#define IRQ_M_EXT 11
+#define IRQ_S_GEXT 12
+#define IRQ_PMU_OVF 13
+#define IRQ_LOCAL_MAX (IRQ_PMU_OVF + 1)
+#define IRQ_LOCAL_MASK GENMASK((IRQ_LOCAL_MAX - 1), 0)
+
+/* Exception causes */
+#define EXC_INST_MISALIGNED 0
+#define EXC_INST_ACCESS 1
+#define EXC_INST_ILLEGAL 2
+#define EXC_BREAKPOINT 3
+#define EXC_LOAD_MISALIGNED 4
+#define EXC_LOAD_ACCESS 5
+#define EXC_STORE_MISALIGNED 6
+#define EXC_STORE_ACCESS 7
+#define EXC_SYSCALL 8
+#define EXC_HYPERVISOR_SYSCALL 9
+#define EXC_SUPERVISOR_SYSCALL 10
+#define EXC_INST_PAGE_FAULT 12
+#define EXC_LOAD_PAGE_FAULT 13
+#define EXC_STORE_PAGE_FAULT 15
+#define EXC_INST_GUEST_PAGE_FAULT 20
+#define EXC_LOAD_GUEST_PAGE_FAULT 21
+#define EXC_VIRTUAL_INST_FAULT 22
+#define EXC_STORE_GUEST_PAGE_FAULT 23
+
+/* PMP configuration */
+#define PMP_R 0x01
+#define PMP_W 0x02
+#define PMP_X 0x04
+#define PMP_A 0x18
+#define PMP_A_TOR 0x08
+#define PMP_A_NA4 0x10
+#define PMP_A_NAPOT 0x18
+#define PMP_L 0x80
+
+/* HSTATUS flags */
+#ifdef CONFIG_64BIT
+#define HSTATUS_VSXL _AC(0x300000000, UL)
+#define HSTATUS_VSXL_SHIFT 32
+#endif
+#define HSTATUS_VTSR _AC(0x00400000, UL)
+#define HSTATUS_VTW _AC(0x00200000, UL)
+#define HSTATUS_VTVM _AC(0x00100000, UL)
+#define HSTATUS_VGEIN _AC(0x0003f000, UL)
+#define HSTATUS_VGEIN_SHIFT 12
+#define HSTATUS_HU _AC(0x00000200, UL)
+#define HSTATUS_SPVP _AC(0x00000100, UL)
+#define HSTATUS_SPV _AC(0x00000080, UL)
+#define HSTATUS_GVA _AC(0x00000040, UL)
+#define HSTATUS_VSBE _AC(0x00000020, UL)
+
+/* HGATP flags */
+#define HGATP_MODE_OFF _AC(0, UL)
+#define HGATP_MODE_SV32X4 _AC(1, UL)
+#define HGATP_MODE_SV39X4 _AC(8, UL)
+#define HGATP_MODE_SV48X4 _AC(9, UL)
+#define HGATP_MODE_SV57X4 _AC(10, UL)
+
+#define HGATP32_MODE_SHIFT 31
+#define HGATP32_VMID_SHIFT 22
+#define HGATP32_VMID GENMASK(28, 22)
+#define HGATP32_PPN GENMASK(21, 0)
+
+#define HGATP64_MODE_SHIFT 60
+#define HGATP64_VMID_SHIFT 44
+#define HGATP64_VMID GENMASK(57, 44)
+#define HGATP64_PPN GENMASK(43, 0)
+
+#define HGATP_PAGE_SHIFT 12
+
+#ifdef CONFIG_64BIT
+#define HGATP_PPN HGATP64_PPN
+#define HGATP_VMID_SHIFT HGATP64_VMID_SHIFT
+#define HGATP_VMID HGATP64_VMID
+#define HGATP_MODE_SHIFT HGATP64_MODE_SHIFT
+#else
+#define HGATP_PPN HGATP32_PPN
+#define HGATP_VMID_SHIFT HGATP32_VMID_SHIFT
+#define HGATP_VMID HGATP32_VMID
+#define HGATP_MODE_SHIFT HGATP32_MODE_SHIFT
+#endif
+
+/* VSIP & HVIP relation */
+#define VSIP_TO_HVIP_SHIFT (IRQ_VS_SOFT - IRQ_S_SOFT)
+#define VSIP_VALID_MASK ((_AC(1, UL) << IRQ_S_SOFT) | \
+ (_AC(1, UL) << IRQ_S_TIMER) | \
+ (_AC(1, UL) << IRQ_S_EXT))
+
+/* AIA CSR bits */
+#define TOPI_IID_SHIFT 16
+#define TOPI_IID_MASK GENMASK(11, 0)
+#define TOPI_IPRIO_MASK GENMASK(7, 0)
+#define TOPI_IPRIO_BITS 8
+
+#define TOPEI_ID_SHIFT 16
+#define TOPEI_ID_MASK GENMASK(10, 0)
+#define TOPEI_PRIO_MASK GENMASK(10, 0)
+
+#define ISELECT_IPRIO0 0x30
+#define ISELECT_IPRIO15 0x3f
+#define ISELECT_MASK GENMASK(8, 0)
+
+#define HVICTL_VTI BIT(30)
+#define HVICTL_IID GENMASK(27, 16)
+#define HVICTL_IID_SHIFT 16
+#define HVICTL_DPR BIT(9)
+#define HVICTL_IPRIOM BIT(8)
+#define HVICTL_IPRIO GENMASK(7, 0)
+
+/* xENVCFG flags */
+#define ENVCFG_STCE (_AC(1, ULL) << 63)
+#define ENVCFG_PBMTE (_AC(1, ULL) << 62)
+#define ENVCFG_CBZE (_AC(1, UL) << 7)
+#define ENVCFG_CBCFE (_AC(1, UL) << 6)
+#define ENVCFG_CBIE_SHIFT 4
+#define ENVCFG_CBIE (_AC(0x3, UL) << ENVCFG_CBIE_SHIFT)
+#define ENVCFG_CBIE_ILL _AC(0x0, UL)
+#define ENVCFG_CBIE_FLUSH _AC(0x1, UL)
+#define ENVCFG_CBIE_INV _AC(0x3, UL)
+#define ENVCFG_FIOM _AC(0x1, UL)
+
+/* symbolic CSR names: */
+#define CSR_CYCLE 0xc00
+#define CSR_TIME 0xc01
+#define CSR_INSTRET 0xc02
+#define CSR_HPMCOUNTER3 0xc03
+#define CSR_HPMCOUNTER4 0xc04
+#define CSR_HPMCOUNTER5 0xc05
+#define CSR_HPMCOUNTER6 0xc06
+#define CSR_HPMCOUNTER7 0xc07
+#define CSR_HPMCOUNTER8 0xc08
+#define CSR_HPMCOUNTER9 0xc09
+#define CSR_HPMCOUNTER10 0xc0a
+#define CSR_HPMCOUNTER11 0xc0b
+#define CSR_HPMCOUNTER12 0xc0c
+#define CSR_HPMCOUNTER13 0xc0d
+#define CSR_HPMCOUNTER14 0xc0e
+#define CSR_HPMCOUNTER15 0xc0f
+#define CSR_HPMCOUNTER16 0xc10
+#define CSR_HPMCOUNTER17 0xc11
+#define CSR_HPMCOUNTER18 0xc12
+#define CSR_HPMCOUNTER19 0xc13
+#define CSR_HPMCOUNTER20 0xc14
+#define CSR_HPMCOUNTER21 0xc15
+#define CSR_HPMCOUNTER22 0xc16
+#define CSR_HPMCOUNTER23 0xc17
+#define CSR_HPMCOUNTER24 0xc18
+#define CSR_HPMCOUNTER25 0xc19
+#define CSR_HPMCOUNTER26 0xc1a
+#define CSR_HPMCOUNTER27 0xc1b
+#define CSR_HPMCOUNTER28 0xc1c
+#define CSR_HPMCOUNTER29 0xc1d
+#define CSR_HPMCOUNTER30 0xc1e
+#define CSR_HPMCOUNTER31 0xc1f
+#define CSR_CYCLEH 0xc80
+#define CSR_TIMEH 0xc81
+#define CSR_INSTRETH 0xc82
+#define CSR_HPMCOUNTER3H 0xc83
+#define CSR_HPMCOUNTER4H 0xc84
+#define CSR_HPMCOUNTER5H 0xc85
+#define CSR_HPMCOUNTER6H 0xc86
+#define CSR_HPMCOUNTER7H 0xc87
+#define CSR_HPMCOUNTER8H 0xc88
+#define CSR_HPMCOUNTER9H 0xc89
+#define CSR_HPMCOUNTER10H 0xc8a
+#define CSR_HPMCOUNTER11H 0xc8b
+#define CSR_HPMCOUNTER12H 0xc8c
+#define CSR_HPMCOUNTER13H 0xc8d
+#define CSR_HPMCOUNTER14H 0xc8e
+#define CSR_HPMCOUNTER15H 0xc8f
+#define CSR_HPMCOUNTER16H 0xc90
+#define CSR_HPMCOUNTER17H 0xc91
+#define CSR_HPMCOUNTER18H 0xc92
+#define CSR_HPMCOUNTER19H 0xc93
+#define CSR_HPMCOUNTER20H 0xc94
+#define CSR_HPMCOUNTER21H 0xc95
+#define CSR_HPMCOUNTER22H 0xc96
+#define CSR_HPMCOUNTER23H 0xc97
+#define CSR_HPMCOUNTER24H 0xc98
+#define CSR_HPMCOUNTER25H 0xc99
+#define CSR_HPMCOUNTER26H 0xc9a
+#define CSR_HPMCOUNTER27H 0xc9b
+#define CSR_HPMCOUNTER28H 0xc9c
+#define CSR_HPMCOUNTER29H 0xc9d
+#define CSR_HPMCOUNTER30H 0xc9e
+#define CSR_HPMCOUNTER31H 0xc9f
+
+#define CSR_SSCOUNTOVF 0xda0
+
+#define CSR_SSTATUS 0x100
+#define CSR_SIE 0x104
+#define CSR_STVEC 0x105
+#define CSR_SCOUNTEREN 0x106
+#define CSR_SSCRATCH 0x140
+#define CSR_SEPC 0x141
+#define CSR_SCAUSE 0x142
+#define CSR_STVAL 0x143
+#define CSR_SIP 0x144
+#define CSR_SATP 0x180
+
+#define CSR_STIMECMP 0x14D
+#define CSR_STIMECMPH 0x15D
+
+/* Supervisor-Level Window to Indirectly Accessed Registers (AIA) */
+#define CSR_SISELECT 0x150
+#define CSR_SIREG 0x151
+
+/* Supervisor-Level Interrupts (AIA) */
+#define CSR_STOPEI 0x15c
+#define CSR_STOPI 0xdb0
+
+/* Supervisor-Level High-Half CSRs (AIA) */
+#define CSR_SIEH 0x114
+#define CSR_SIPH 0x154
+
+#define CSR_VSSTATUS 0x200
+#define CSR_VSIE 0x204
+#define CSR_VSTVEC 0x205
+#define CSR_VSSCRATCH 0x240
+#define CSR_VSEPC 0x241
+#define CSR_VSCAUSE 0x242
+#define CSR_VSTVAL 0x243
+#define CSR_VSIP 0x244
+#define CSR_VSATP 0x280
+#define CSR_VSTIMECMP 0x24D
+#define CSR_VSTIMECMPH 0x25D
+
+#define CSR_HSTATUS 0x600
+#define CSR_HEDELEG 0x602
+#define CSR_HIDELEG 0x603
+#define CSR_HIE 0x604
+#define CSR_HTIMEDELTA 0x605
+#define CSR_HCOUNTEREN 0x606
+#define CSR_HGEIE 0x607
+#define CSR_HENVCFG 0x60a
+#define CSR_HTIMEDELTAH 0x615
+#define CSR_HENVCFGH 0x61a
+#define CSR_HTVAL 0x643
+#define CSR_HIP 0x644
+#define CSR_HVIP 0x645
+#define CSR_HTINST 0x64a
+#define CSR_HGATP 0x680
+#define CSR_HGEIP 0xe12
+
+/* Virtual Interrupts and Interrupt Priorities (H-extension with AIA) */
+#define CSR_HVIEN 0x608
+#define CSR_HVICTL 0x609
+#define CSR_HVIPRIO1 0x646
+#define CSR_HVIPRIO2 0x647
+
+/* VS-Level Window to Indirectly Accessed Registers (H-extension with AIA) */
+#define CSR_VSISELECT 0x250
+#define CSR_VSIREG 0x251
+
+/* VS-Level Interrupts (H-extension with AIA) */
+#define CSR_VSTOPEI 0x25c
+#define CSR_VSTOPI 0xeb0
+
+/* Hypervisor and VS-Level High-Half CSRs (H-extension with AIA) */
+#define CSR_HIDELEGH 0x613
+#define CSR_HVIENH 0x618
+#define CSR_HVIPH 0x655
+#define CSR_HVIPRIO1H 0x656
+#define CSR_HVIPRIO2H 0x657
+#define CSR_VSIEH 0x214
+#define CSR_VSIPH 0x254
+
+#define CSR_MSTATUS 0x300
+#define CSR_MISA 0x301
+#define CSR_MIDELEG 0x303
+#define CSR_MIE 0x304
+#define CSR_MTVEC 0x305
+#define CSR_MENVCFG 0x30a
+#define CSR_MENVCFGH 0x31a
+#define CSR_MSCRATCH 0x340
+#define CSR_MEPC 0x341
+#define CSR_MCAUSE 0x342
+#define CSR_MTVAL 0x343
+#define CSR_MIP 0x344
+#define CSR_PMPCFG0 0x3a0
+#define CSR_PMPADDR0 0x3b0
+#define CSR_MVENDORID 0xf11
+#define CSR_MARCHID 0xf12
+#define CSR_MIMPID 0xf13
+#define CSR_MHARTID 0xf14
+
+/* Machine-Level Window to Indirectly Accessed Registers (AIA) */
+#define CSR_MISELECT 0x350
+#define CSR_MIREG 0x351
+
+/* Machine-Level Interrupts (AIA) */
+#define CSR_MTOPEI 0x35c
+#define CSR_MTOPI 0xfb0
+
+/* Virtual Interrupts for Supervisor Level (AIA) */
+#define CSR_MVIEN 0x308
+#define CSR_MVIP 0x309
+
+/* Machine-Level High-Half CSRs (AIA) */
+#define CSR_MIDELEGH 0x313
+#define CSR_MIEH 0x314
+#define CSR_MVIENH 0x318
+#define CSR_MVIPH 0x319
+#define CSR_MIPH 0x354
+
+#define CSR_VSTART 0x8
+#define CSR_VCSR 0xf
+#define CSR_VL 0xc20
+#define CSR_VTYPE 0xc21
+#define CSR_VLENB 0xc22
+
+#ifdef CONFIG_RISCV_M_MODE
+# define CSR_STATUS CSR_MSTATUS
+# define CSR_IE CSR_MIE
+# define CSR_TVEC CSR_MTVEC
+# define CSR_SCRATCH CSR_MSCRATCH
+# define CSR_EPC CSR_MEPC
+# define CSR_CAUSE CSR_MCAUSE
+# define CSR_TVAL CSR_MTVAL
+# define CSR_IP CSR_MIP
+
+# define CSR_IEH CSR_MIEH
+# define CSR_ISELECT CSR_MISELECT
+# define CSR_IREG CSR_MIREG
+# define CSR_IPH CSR_MIPH
+# define CSR_TOPEI CSR_MTOPEI
+# define CSR_TOPI CSR_MTOPI
+
+# define SR_IE SR_MIE
+# define SR_PIE SR_MPIE
+# define SR_PP SR_MPP
+
+# define RV_IRQ_SOFT IRQ_M_SOFT
+# define RV_IRQ_TIMER IRQ_M_TIMER
+# define RV_IRQ_EXT IRQ_M_EXT
+#else /* CONFIG_RISCV_M_MODE */
+# define CSR_STATUS CSR_SSTATUS
+# define CSR_IE CSR_SIE
+# define CSR_TVEC CSR_STVEC
+# define CSR_SCRATCH CSR_SSCRATCH
+# define CSR_EPC CSR_SEPC
+# define CSR_CAUSE CSR_SCAUSE
+# define CSR_TVAL CSR_STVAL
+# define CSR_IP CSR_SIP
+
+# define CSR_IEH CSR_SIEH
+# define CSR_ISELECT CSR_SISELECT
+# define CSR_IREG CSR_SIREG
+# define CSR_IPH CSR_SIPH
+# define CSR_TOPEI CSR_STOPEI
+# define CSR_TOPI CSR_STOPI
+
+# define SR_IE SR_SIE
+# define SR_PIE SR_SPIE
+# define SR_PP SR_SPP
+
+# define RV_IRQ_SOFT IRQ_S_SOFT
+# define RV_IRQ_TIMER IRQ_S_TIMER
+# define RV_IRQ_EXT IRQ_S_EXT
+# define RV_IRQ_PMU IRQ_PMU_OVF
+# define SIP_LCOFIP (_AC(0x1, UL) << IRQ_PMU_OVF)
+
+#endif /* !CONFIG_RISCV_M_MODE */
+
+/* IE/IP (Supervisor/Machine Interrupt Enable/Pending) flags */
+#define IE_SIE (_AC(0x1, UL) << RV_IRQ_SOFT)
+#define IE_TIE (_AC(0x1, UL) << RV_IRQ_TIMER)
+#define IE_EIE (_AC(0x1, UL) << RV_IRQ_EXT)
+
+#ifdef __ASSEMBLY__
+#define __ASM_STR(x) x
+#else
+#define __ASM_STR(x) #x
+#endif
+
+#ifndef __ASSEMBLY__
+
+#define csr_swap(csr, val) \
+({ \
+ unsigned long __v = (unsigned long)(val); \
+ __asm__ __volatile__ ("csrrw %0, " __ASM_STR(csr) ", %1"\
+ : "=r" (__v) : "rK" (__v) \
+ : "memory"); \
+ __v; \
+})
+
+#define csr_read(csr) \
+({ \
+ register unsigned long __v; \
+ __asm__ __volatile__ ("csrr %0, " __ASM_STR(csr) \
+ : "=r" (__v) : \
+ : "memory"); \
+ __v; \
+})
+
+#define csr_write(csr, val) \
+({ \
+ unsigned long __v = (unsigned long)(val); \
+ __asm__ __volatile__ ("csrw " __ASM_STR(csr) ", %0" \
+ : : "rK" (__v) \
+ : "memory"); \
+})
+
+#define csr_read_set(csr, val) \
+({ \
+ unsigned long __v = (unsigned long)(val); \
+ __asm__ __volatile__ ("csrrs %0, " __ASM_STR(csr) ", %1"\
+ : "=r" (__v) : "rK" (__v) \
+ : "memory"); \
+ __v; \
+})
+
+#define csr_set(csr, val) \
+({ \
+ unsigned long __v = (unsigned long)(val); \
+ __asm__ __volatile__ ("csrs " __ASM_STR(csr) ", %0" \
+ : : "rK" (__v) \
+ : "memory"); \
+})
+
+#define csr_read_clear(csr, val) \
+({ \
+ unsigned long __v = (unsigned long)(val); \
+ __asm__ __volatile__ ("csrrc %0, " __ASM_STR(csr) ", %1"\
+ : "=r" (__v) : "rK" (__v) \
+ : "memory"); \
+ __v; \
+})
+
+#define csr_clear(csr, val) \
+({ \
+ unsigned long __v = (unsigned long)(val); \
+ __asm__ __volatile__ ("csrc " __ASM_STR(csr) ", %0" \
+ : : "rK" (__v) \
+ : "memory"); \
+})
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_RISCV_CSR_H */
--
2.34.1
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^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v4 05/11] tools: riscv: Add header file vdso/processor.h
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
` (3 preceding siblings ...)
2023-12-12 9:31 ` [PATCH v4 04/11] tools: riscv: Add header file csr.h Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-13 14:02 ` Andrew Jones
2023-12-12 9:31 ` [PATCH v4 06/11] KVM: riscv: selftests: Switch to use macro from csr.h Haibo Xu
` (5 subsequent siblings)
10 siblings, 1 reply; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale,
Daniel Henrique Barboza, Jisheng Zhang, Samuel Holland,
Minda Chen, Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Thomas Huth, Aaron Lewis, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
Borrow the cpu_relax() definitions from kernel's
arch/riscv/include/asm/vdso/processor.h to tools/ for riscv.
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
---
tools/arch/riscv/include/asm/vdso/processor.h | 32 +++++++++++++++++++
1 file changed, 32 insertions(+)
create mode 100644 tools/arch/riscv/include/asm/vdso/processor.h
diff --git a/tools/arch/riscv/include/asm/vdso/processor.h b/tools/arch/riscv/include/asm/vdso/processor.h
new file mode 100644
index 000000000000..662aca039848
--- /dev/null
+++ b/tools/arch/riscv/include/asm/vdso/processor.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_VDSO_PROCESSOR_H
+#define __ASM_VDSO_PROCESSOR_H
+
+#ifndef __ASSEMBLY__
+
+#include <asm-generic/barrier.h>
+
+static inline void cpu_relax(void)
+{
+#ifdef __riscv_muldiv
+ int dummy;
+ /* In lieu of a halt instruction, induce a long-latency stall. */
+ __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
+#endif
+
+#ifdef CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE
+ /*
+ * Reduce instruction retirement.
+ * This assumes the PC changes.
+ */
+ __asm__ __volatile__ ("pause");
+#else
+ /* Encoding of the pause instruction */
+ __asm__ __volatile__ (".4byte 0x100000F");
+#endif
+ barrier();
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_VDSO_PROCESSOR_H */
--
2.34.1
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^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v4 05/11] tools: riscv: Add header file vdso/processor.h
2023-12-12 9:31 ` [PATCH v4 05/11] tools: riscv: Add header file vdso/processor.h Haibo Xu
@ 2023-12-13 14:02 ` Andrew Jones
0 siblings, 0 replies; 28+ messages in thread
From: Andrew Jones @ 2023-12-13 14:02 UTC (permalink / raw)
To: Haibo Xu
Cc: xiaobo55x, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale,
Daniel Henrique Barboza, Jisheng Zhang, Samuel Holland,
Minda Chen, Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Thomas Huth, Aaron Lewis, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
On Tue, Dec 12, 2023 at 05:31:14PM +0800, Haibo Xu wrote:
> Borrow the cpu_relax() definitions from kernel's
> arch/riscv/include/asm/vdso/processor.h to tools/ for riscv.
>
> Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
> ---
> tools/arch/riscv/include/asm/vdso/processor.h | 32 +++++++++++++++++++
> 1 file changed, 32 insertions(+)
> create mode 100644 tools/arch/riscv/include/asm/vdso/processor.h
>
> diff --git a/tools/arch/riscv/include/asm/vdso/processor.h b/tools/arch/riscv/include/asm/vdso/processor.h
> new file mode 100644
> index 000000000000..662aca039848
> --- /dev/null
> +++ b/tools/arch/riscv/include/asm/vdso/processor.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +#ifndef __ASM_VDSO_PROCESSOR_H
> +#define __ASM_VDSO_PROCESSOR_H
> +
> +#ifndef __ASSEMBLY__
> +
> +#include <asm-generic/barrier.h>
> +
> +static inline void cpu_relax(void)
> +{
> +#ifdef __riscv_muldiv
> + int dummy;
> + /* In lieu of a halt instruction, induce a long-latency stall. */
> + __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
> +#endif
> +
> +#ifdef CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE
> + /*
> + * Reduce instruction retirement.
> + * This assumes the PC changes.
> + */
> + __asm__ __volatile__ ("pause");
> +#else
> + /* Encoding of the pause instruction */
> + __asm__ __volatile__ (".4byte 0x100000F");
> +#endif
> + barrier();
> +}
> +
> +#endif /* __ASSEMBLY__ */
> +
> +#endif /* __ASM_VDSO_PROCESSOR_H */
> --
> 2.34.1
>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v4 06/11] KVM: riscv: selftests: Switch to use macro from csr.h
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
` (4 preceding siblings ...)
2023-12-12 9:31 ` [PATCH v4 05/11] tools: riscv: Add header file vdso/processor.h Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-12 9:31 ` [PATCH v4 07/11] KVM: riscv: selftests: Add exception handling support Haibo Xu
` (4 subsequent siblings)
10 siblings, 0 replies; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Mayuresh Chitale, Daniel Henrique Barboza,
wchen, Conor Dooley, Minda Chen, Heiko Stuebner, Jisheng Zhang,
Samuel Holland, Sean Christopherson, Like Xu, Peter Xu,
Vipin Sharma, Aaron Lewis, Maciej Wieczor-Retman, Thomas Huth,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
tools/testing/selftests/kvm/include/riscv/processor.h | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/riscv/processor.h b/tools/testing/selftests/kvm/include/riscv/processor.h
index 5b62a3d2aa9b..6f9e1e5e466d 100644
--- a/tools/testing/selftests/kvm/include/riscv/processor.h
+++ b/tools/testing/selftests/kvm/include/riscv/processor.h
@@ -7,8 +7,9 @@
#ifndef SELFTEST_KVM_PROCESSOR_H
#define SELFTEST_KVM_PROCESSOR_H
-#include "kvm_util.h"
#include <linux/stringify.h>
+#include <asm/csr.h>
+#include "kvm_util.h"
static inline uint64_t __kvm_reg_id(uint64_t type, uint64_t idx,
uint64_t size)
@@ -95,13 +96,6 @@ static inline uint64_t __kvm_reg_id(uint64_t type, uint64_t idx,
#define PGTBL_PAGE_SIZE PGTBL_L0_BLOCK_SIZE
#define PGTBL_PAGE_SIZE_SHIFT PGTBL_L0_BLOCK_SHIFT
-#define SATP_PPN _AC(0x00000FFFFFFFFFFF, UL)
-#define SATP_MODE_39 _AC(0x8000000000000000, UL)
-#define SATP_MODE_48 _AC(0x9000000000000000, UL)
-#define SATP_ASID_BITS 16
-#define SATP_ASID_SHIFT 44
-#define SATP_ASID_MASK _AC(0xFFFF, UL)
-
#define SBI_EXT_EXPERIMENTAL_START 0x08000000
#define SBI_EXT_EXPERIMENTAL_END 0x08FFFFFF
--
2.34.1
_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v4 07/11] KVM: riscv: selftests: Add exception handling support
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
` (5 preceding siblings ...)
2023-12-12 9:31 ` [PATCH v4 06/11] KVM: riscv: selftests: Switch to use macro from csr.h Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-12 9:31 ` [PATCH v4 08/11] KVM: riscv: selftests: Add guest helper to get vcpu id Haibo Xu
` (3 subsequent siblings)
10 siblings, 0 replies; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale,
Daniel Henrique Barboza, wchen, Samuel Holland, Minda Chen,
Jisheng Zhang, Sean Christopherson, Like Xu, Peter Xu,
Vipin Sharma, Thomas Huth, Maciej Wieczor-Retman, Aaron Lewis,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
Add the infrastructure for guest exception handling in riscv selftests.
Customized handlers can be enabled by vm_install_exception_handler(vector)
or vm_install_interrupt_handler().
The code is inspired from that of x86/arm64.
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
tools/testing/selftests/kvm/Makefile | 1 +
.../selftests/kvm/include/riscv/processor.h | 43 ++++++++
.../selftests/kvm/lib/riscv/handlers.S | 101 ++++++++++++++++++
.../selftests/kvm/lib/riscv/processor.c | 69 ++++++++++++
4 files changed, 214 insertions(+)
create mode 100644 tools/testing/selftests/kvm/lib/riscv/handlers.S
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index bb03e278a163..671224c4b9e0 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -63,6 +63,7 @@ LIBKVM_s390x += lib/s390x/diag318_test_handler.c
LIBKVM_s390x += lib/s390x/processor.c
LIBKVM_s390x += lib/s390x/ucall.c
+LIBKVM_riscv += lib/riscv/handlers.S
LIBKVM_riscv += lib/riscv/processor.c
LIBKVM_riscv += lib/riscv/ucall.c
diff --git a/tools/testing/selftests/kvm/include/riscv/processor.h b/tools/testing/selftests/kvm/include/riscv/processor.h
index 6f9e1e5e466d..b68b1b731a34 100644
--- a/tools/testing/selftests/kvm/include/riscv/processor.h
+++ b/tools/testing/selftests/kvm/include/riscv/processor.h
@@ -42,6 +42,49 @@ static inline uint64_t __kvm_reg_id(uint64_t type, uint64_t idx,
#define RISCV_ISA_EXT_REG(idx) __kvm_reg_id(KVM_REG_RISCV_ISA_EXT, \
idx, KVM_REG_SIZE_ULONG)
+struct ex_regs {
+ unsigned long ra;
+ unsigned long sp;
+ unsigned long gp;
+ unsigned long tp;
+ unsigned long t0;
+ unsigned long t1;
+ unsigned long t2;
+ unsigned long s0;
+ unsigned long s1;
+ unsigned long a0;
+ unsigned long a1;
+ unsigned long a2;
+ unsigned long a3;
+ unsigned long a4;
+ unsigned long a5;
+ unsigned long a6;
+ unsigned long a7;
+ unsigned long s2;
+ unsigned long s3;
+ unsigned long s4;
+ unsigned long s5;
+ unsigned long s6;
+ unsigned long s7;
+ unsigned long s8;
+ unsigned long s9;
+ unsigned long s10;
+ unsigned long s11;
+ unsigned long t3;
+ unsigned long t4;
+ unsigned long t5;
+ unsigned long t6;
+ unsigned long epc;
+ unsigned long status;
+ unsigned long cause;
+};
+
+#define NR_VECTORS 2
+#define NR_EXCEPTIONS 32
+#define EC_MASK (NR_EXCEPTIONS - 1)
+
+void vm_install_interrupt_handler(struct kvm_vm *vm, exception_handler_fn handler);
+
/* L3 index Bit[47:39] */
#define PGTBL_L3_INDEX_MASK 0x0000FF8000000000ULL
#define PGTBL_L3_INDEX_SHIFT 39
diff --git a/tools/testing/selftests/kvm/lib/riscv/handlers.S b/tools/testing/selftests/kvm/lib/riscv/handlers.S
new file mode 100644
index 000000000000..aa0abd3f35bb
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/riscv/handlers.S
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2023 Intel Corporation
+ */
+
+#ifndef __ASSEMBLY__
+#define __ASSEMBLY__
+#endif
+
+#include <asm/csr.h>
+
+.macro save_context
+ addi sp, sp, (-8*34)
+ sd x1, 0(sp)
+ sd x2, 8(sp)
+ sd x3, 16(sp)
+ sd x4, 24(sp)
+ sd x5, 32(sp)
+ sd x6, 40(sp)
+ sd x7, 48(sp)
+ sd x8, 56(sp)
+ sd x9, 64(sp)
+ sd x10, 72(sp)
+ sd x11, 80(sp)
+ sd x12, 88(sp)
+ sd x13, 96(sp)
+ sd x14, 104(sp)
+ sd x15, 112(sp)
+ sd x16, 120(sp)
+ sd x17, 128(sp)
+ sd x18, 136(sp)
+ sd x19, 144(sp)
+ sd x20, 152(sp)
+ sd x21, 160(sp)
+ sd x22, 168(sp)
+ sd x23, 176(sp)
+ sd x24, 184(sp)
+ sd x25, 192(sp)
+ sd x26, 200(sp)
+ sd x27, 208(sp)
+ sd x28, 216(sp)
+ sd x29, 224(sp)
+ sd x30, 232(sp)
+ sd x31, 240(sp)
+ csrr s0, CSR_SEPC
+ csrr s1, CSR_SSTATUS
+ csrr s2, CSR_SCAUSE
+ sd s0, 248(sp)
+ sd s1, 256(sp)
+ sd s2, 264(sp)
+.endm
+
+.macro restore_context
+ ld s2, 264(sp)
+ ld s1, 256(sp)
+ ld s0, 248(sp)
+ csrw CSR_SCAUSE, s2
+ csrw CSR_SSTATUS, s1
+ csrw CSR_SEPC, s0
+ ld x31, 240(sp)
+ ld x30, 232(sp)
+ ld x29, 224(sp)
+ ld x28, 216(sp)
+ ld x27, 208(sp)
+ ld x26, 200(sp)
+ ld x25, 192(sp)
+ ld x24, 184(sp)
+ ld x23, 176(sp)
+ ld x22, 168(sp)
+ ld x21, 160(sp)
+ ld x20, 152(sp)
+ ld x19, 144(sp)
+ ld x18, 136(sp)
+ ld x17, 128(sp)
+ ld x16, 120(sp)
+ ld x15, 112(sp)
+ ld x14, 104(sp)
+ ld x13, 96(sp)
+ ld x12, 88(sp)
+ ld x11, 80(sp)
+ ld x10, 72(sp)
+ ld x9, 64(sp)
+ ld x8, 56(sp)
+ ld x7, 48(sp)
+ ld x6, 40(sp)
+ ld x5, 32(sp)
+ ld x4, 24(sp)
+ ld x3, 16(sp)
+ ld x2, 8(sp)
+ ld x1, 0(sp)
+ addi sp, sp, (8*34)
+.endm
+
+.balign 4
+.global exception_vectors
+exception_vectors:
+ save_context
+ move a0, sp
+ call route_exception
+ restore_context
+ sret
diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
index d146ca71e0c0..efd9ac4b0198 100644
--- a/tools/testing/selftests/kvm/lib/riscv/processor.c
+++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
@@ -13,6 +13,8 @@
#define DEFAULT_RISCV_GUEST_STACK_VADDR_MIN 0xac0000
+static vm_vaddr_t exception_handlers;
+
static uint64_t page_align(struct kvm_vm *vm, uint64_t v)
{
return (v + vm->page_size) & ~(vm->page_size - 1);
@@ -364,6 +366,73 @@ void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
va_end(ap);
}
+void kvm_exit_unexpected_exception(int vector, int ec)
+{
+ ucall(UCALL_UNHANDLED, 2, vector, ec);
+}
+
void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
{
+ struct ucall uc;
+
+ if (get_ucall(vcpu, &uc) == UCALL_UNHANDLED) {
+ TEST_FAIL("Unexpected exception (vector:0x%lx, ec:0x%lx)",
+ uc.args[0], uc.args[1]);
+ }
+}
+
+struct handlers {
+ exception_handler_fn exception_handlers[NR_VECTORS][NR_EXCEPTIONS];
+};
+
+void route_exception(struct ex_regs *regs)
+{
+ struct handlers *handlers = (struct handlers *)exception_handlers;
+ int vector = 0, ec;
+
+ ec = regs->cause & ~CAUSE_IRQ_FLAG;
+ if (ec >= NR_EXCEPTIONS)
+ goto unexpected_exception;
+
+ /* Use the same handler for all the interrupts */
+ if (regs->cause & CAUSE_IRQ_FLAG) {
+ vector = 1;
+ ec = 0;
+ }
+
+ if (handlers && handlers->exception_handlers[vector][ec])
+ return handlers->exception_handlers[vector][ec](regs);
+
+unexpected_exception:
+ return kvm_exit_unexpected_exception(vector, ec);
+}
+
+void vcpu_init_vector_tables(struct kvm_vcpu *vcpu)
+{
+ extern char exception_vectors;
+
+ vcpu_set_reg(vcpu, RISCV_CSR_REG(stvec), (unsigned long)&exception_vectors);
+}
+
+void vm_init_vector_tables(struct kvm_vm *vm)
+{
+ vm->handlers = __vm_vaddr_alloc(vm, sizeof(struct handlers),
+ vm->page_size, MEM_REGION_DATA);
+
+ *(vm_vaddr_t *)addr_gva2hva(vm, (vm_vaddr_t)(&exception_handlers)) = vm->handlers;
+}
+
+void vm_install_exception_handler(struct kvm_vm *vm, int vector, exception_handler_fn handler)
+{
+ struct handlers *handlers = addr_gva2hva(vm, vm->handlers);
+
+ assert(vector < NR_EXCEPTIONS);
+ handlers->exception_handlers[0][vector] = handler;
+}
+
+void vm_install_interrupt_handler(struct kvm_vm *vm, exception_handler_fn handler)
+{
+ struct handlers *handlers = addr_gva2hva(vm, vm->handlers);
+
+ handlers->exception_handlers[1][0] = handler;
}
--
2.34.1
_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v4 08/11] KVM: riscv: selftests: Add guest helper to get vcpu id
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
` (6 preceding siblings ...)
2023-12-12 9:31 ` [PATCH v4 07/11] KVM: riscv: selftests: Add exception handling support Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-13 14:08 ` Andrew Jones
2023-12-12 9:31 ` [PATCH v4 09/11] KVM: riscv: selftests: Change vcpu_has_ext to a common function Haibo Xu
` (2 subsequent siblings)
10 siblings, 1 reply; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale,
Greentime Hu, wchen, Jisheng Zhang, Minda Chen, Samuel Holland,
Sean Christopherson, Like Xu, Peter Xu, Vipin Sharma, Aaron Lewis,
Thomas Huth, Maciej Wieczor-Retman, linux-kernel, linux-riscv,
kvm, linux-kselftest, linux-arm-kernel, kvmarm, kvm-riscv
Add guest_get_vcpuid() helper to simplify accessing to per-cpu
private data. The sscratch CSR was used to store the vcpu id.
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
tools/testing/selftests/kvm/include/aarch64/processor.h | 4 ----
tools/testing/selftests/kvm/include/kvm_util_base.h | 9 +++++++++
tools/testing/selftests/kvm/lib/riscv/processor.c | 8 ++++++++
3 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index c42d683102c7..16ae0ac01879 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -226,8 +226,4 @@ void smccc_smc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
uint64_t arg6, struct arm_smccc_res *res);
-
-
-uint32_t guest_get_vcpuid(void);
-
#endif /* SELFTEST_KVM_PROCESSOR_H */
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index a18db6a7b3cf..666438113d22 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -932,4 +932,13 @@ void kvm_selftest_arch_init(void);
void kvm_arch_vm_post_create(struct kvm_vm *vm);
+void vm_init_vector_tables(struct kvm_vm *vm);
+void vcpu_init_vector_tables(struct kvm_vcpu *vcpu);
+
+struct ex_regs;
+typedef void(*exception_handler_fn)(struct ex_regs *);
+void vm_install_exception_handler(struct kvm_vm *vm, int vector, exception_handler_fn handler);
+
+uint32_t guest_get_vcpuid(void);
+
#endif /* SELFTEST_KVM_UTIL_BASE_H */
diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
index efd9ac4b0198..39a1e9902dec 100644
--- a/tools/testing/selftests/kvm/lib/riscv/processor.c
+++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
@@ -316,6 +316,9 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.sp), stack_vaddr + stack_size);
vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.pc), (unsigned long)guest_code);
+ /* Setup sscratch for guest_get_vcpuid() */
+ vcpu_set_reg(vcpu, RISCV_CSR_REG(sscratch), vcpu_id);
+
/* Setup default exception vector of guest */
vcpu_set_reg(vcpu, RISCV_CSR_REG(stvec), (unsigned long)guest_unexp_trap);
@@ -436,3 +439,8 @@ void vm_install_interrupt_handler(struct kvm_vm *vm, exception_handler_fn handle
handlers->exception_handlers[1][0] = handler;
}
+
+uint32_t guest_get_vcpuid(void)
+{
+ return csr_read(CSR_SSCRATCH);
+}
--
2.34.1
_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v4 08/11] KVM: riscv: selftests: Add guest helper to get vcpu id
2023-12-12 9:31 ` [PATCH v4 08/11] KVM: riscv: selftests: Add guest helper to get vcpu id Haibo Xu
@ 2023-12-13 14:08 ` Andrew Jones
2023-12-19 2:28 ` Haibo Xu
0 siblings, 1 reply; 28+ messages in thread
From: Andrew Jones @ 2023-12-13 14:08 UTC (permalink / raw)
To: Haibo Xu
Cc: xiaobo55x, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Conor Dooley, Mayuresh Chitale,
Greentime Hu, wchen, Jisheng Zhang, Minda Chen, Samuel Holland,
Sean Christopherson, Like Xu, Peter Xu, Vipin Sharma, Aaron Lewis,
Thomas Huth, Maciej Wieczor-Retman, linux-kernel, linux-riscv,
kvm, linux-kselftest, linux-arm-kernel, kvmarm, kvm-riscv
On Tue, Dec 12, 2023 at 05:31:17PM +0800, Haibo Xu wrote:
> Add guest_get_vcpuid() helper to simplify accessing to per-cpu
> private data. The sscratch CSR was used to store the vcpu id.
>
> Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
> ---
> tools/testing/selftests/kvm/include/aarch64/processor.h | 4 ----
> tools/testing/selftests/kvm/include/kvm_util_base.h | 9 +++++++++
> tools/testing/selftests/kvm/lib/riscv/processor.c | 8 ++++++++
> 3 files changed, 17 insertions(+), 4 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
> index c42d683102c7..16ae0ac01879 100644
> --- a/tools/testing/selftests/kvm/include/aarch64/processor.h
> +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
> @@ -226,8 +226,4 @@ void smccc_smc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
> uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
> uint64_t arg6, struct arm_smccc_res *res);
>
> -
> -
> -uint32_t guest_get_vcpuid(void);
> -
> #endif /* SELFTEST_KVM_PROCESSOR_H */
> diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> index a18db6a7b3cf..666438113d22 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> @@ -932,4 +932,13 @@ void kvm_selftest_arch_init(void);
>
> void kvm_arch_vm_post_create(struct kvm_vm *vm);
>
> +void vm_init_vector_tables(struct kvm_vm *vm);
> +void vcpu_init_vector_tables(struct kvm_vcpu *vcpu);
> +
> +struct ex_regs;
> +typedef void(*exception_handler_fn)(struct ex_regs *);
> +void vm_install_exception_handler(struct kvm_vm *vm, int vector, exception_handler_fn handler);
I think something happend on rebase since the above should be in a
different patch (and were for v3). I suggest checking your previous
and current version branches with git-range-diff after rebasing in
order to catch stuff like this.
Thanks,
drew
> +
> +uint32_t guest_get_vcpuid(void);
> +
> #endif /* SELFTEST_KVM_UTIL_BASE_H */
> diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
> index efd9ac4b0198..39a1e9902dec 100644
> --- a/tools/testing/selftests/kvm/lib/riscv/processor.c
> +++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
> @@ -316,6 +316,9 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
> vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.sp), stack_vaddr + stack_size);
> vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.pc), (unsigned long)guest_code);
>
> + /* Setup sscratch for guest_get_vcpuid() */
> + vcpu_set_reg(vcpu, RISCV_CSR_REG(sscratch), vcpu_id);
> +
> /* Setup default exception vector of guest */
> vcpu_set_reg(vcpu, RISCV_CSR_REG(stvec), (unsigned long)guest_unexp_trap);
>
> @@ -436,3 +439,8 @@ void vm_install_interrupt_handler(struct kvm_vm *vm, exception_handler_fn handle
>
> handlers->exception_handlers[1][0] = handler;
> }
> +
> +uint32_t guest_get_vcpuid(void)
> +{
> + return csr_read(CSR_SSCRATCH);
> +}
> --
> 2.34.1
>
_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v4 08/11] KVM: riscv: selftests: Add guest helper to get vcpu id
2023-12-13 14:08 ` Andrew Jones
@ 2023-12-19 2:28 ` Haibo Xu
0 siblings, 0 replies; 28+ messages in thread
From: Haibo Xu @ 2023-12-19 2:28 UTC (permalink / raw)
To: Andrew Jones
Cc: Haibo Xu, Paul Walmsley, Palmer Dabbelt, Albert Ou, Paolo Bonzini,
Shuah Khan, Marc Zyngier, Oliver Upton, James Morse,
Suzuki K Poulose, Zenghui Yu, Anup Patel, Atish Patra, Guo Ren,
Conor Dooley, Mayuresh Chitale, Greentime Hu, wchen,
Jisheng Zhang, Minda Chen, Samuel Holland, Sean Christopherson,
Like Xu, Peter Xu, Vipin Sharma, Aaron Lewis, Thomas Huth,
Maciej Wieczor-Retman, linux-kernel, linux-riscv, kvm,
linux-kselftest, linux-arm-kernel, kvmarm, kvm-riscv
On Wed, Dec 13, 2023 at 10:08 PM Andrew Jones <ajones@ventanamicro.com> wrote:
>
> On Tue, Dec 12, 2023 at 05:31:17PM +0800, Haibo Xu wrote:
> > Add guest_get_vcpuid() helper to simplify accessing to per-cpu
> > private data. The sscratch CSR was used to store the vcpu id.
> >
> > Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
> > Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
> > ---
> > tools/testing/selftests/kvm/include/aarch64/processor.h | 4 ----
> > tools/testing/selftests/kvm/include/kvm_util_base.h | 9 +++++++++
> > tools/testing/selftests/kvm/lib/riscv/processor.c | 8 ++++++++
> > 3 files changed, 17 insertions(+), 4 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
> > index c42d683102c7..16ae0ac01879 100644
> > --- a/tools/testing/selftests/kvm/include/aarch64/processor.h
> > +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
> > @@ -226,8 +226,4 @@ void smccc_smc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
> > uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
> > uint64_t arg6, struct arm_smccc_res *res);
> >
> > -
> > -
> > -uint32_t guest_get_vcpuid(void);
> > -
> > #endif /* SELFTEST_KVM_PROCESSOR_H */
> > diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> > index a18db6a7b3cf..666438113d22 100644
> > --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> > +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> > @@ -932,4 +932,13 @@ void kvm_selftest_arch_init(void);
> >
> > void kvm_arch_vm_post_create(struct kvm_vm *vm);
> >
> > +void vm_init_vector_tables(struct kvm_vm *vm);
> > +void vcpu_init_vector_tables(struct kvm_vcpu *vcpu);
> > +
> > +struct ex_regs;
> > +typedef void(*exception_handler_fn)(struct ex_regs *);
> > +void vm_install_exception_handler(struct kvm_vm *vm, int vector, exception_handler_fn handler);
>
> I think something happend on rebase since the above should be in a
> different patch (and were for v3). I suggest checking your previous
> and current version branches with git-range-diff after rebasing in
> order to catch stuff like this.
>
> Thanks,
> drew
>
Thanks for pointing it out. Will fix it in v5.
> > +
> > +uint32_t guest_get_vcpuid(void);
> > +
> > #endif /* SELFTEST_KVM_UTIL_BASE_H */
> > diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
> > index efd9ac4b0198..39a1e9902dec 100644
> > --- a/tools/testing/selftests/kvm/lib/riscv/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
> > @@ -316,6 +316,9 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
> > vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.sp), stack_vaddr + stack_size);
> > vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.pc), (unsigned long)guest_code);
> >
> > + /* Setup sscratch for guest_get_vcpuid() */
> > + vcpu_set_reg(vcpu, RISCV_CSR_REG(sscratch), vcpu_id);
> > +
> > /* Setup default exception vector of guest */
> > vcpu_set_reg(vcpu, RISCV_CSR_REG(stvec), (unsigned long)guest_unexp_trap);
> >
> > @@ -436,3 +439,8 @@ void vm_install_interrupt_handler(struct kvm_vm *vm, exception_handler_fn handle
> >
> > handlers->exception_handlers[1][0] = handler;
> > }
> > +
> > +uint32_t guest_get_vcpuid(void)
> > +{
> > + return csr_read(CSR_SSCRATCH);
> > +}
> > --
> > 2.34.1
> >
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v4 09/11] KVM: riscv: selftests: Change vcpu_has_ext to a common function
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
` (7 preceding siblings ...)
2023-12-12 9:31 ` [PATCH v4 08/11] KVM: riscv: selftests: Add guest helper to get vcpu id Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-12 9:31 ` [PATCH v4 10/11] KVM: riscv: selftests: Add sstc timer test Haibo Xu
2023-12-12 9:31 ` [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch " Haibo Xu
10 siblings, 0 replies; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Mayuresh Chitale, Greentime Hu,
Conor Dooley, Heiko Stuebner, Minda Chen, Samuel Holland,
Jisheng Zhang, Sean Christopherson, Peter Xu, Like Xu,
Vipin Sharma, Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
Move vcpu_has_ext to the processor.c and rename it to __vcpu_has_ext
so that other test cases can use it for vCPU extension check.
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
tools/testing/selftests/kvm/include/riscv/processor.h | 2 ++
tools/testing/selftests/kvm/lib/riscv/processor.c | 10 ++++++++++
tools/testing/selftests/kvm/riscv/get-reg-list.c | 11 +----------
3 files changed, 13 insertions(+), 10 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/riscv/processor.h b/tools/testing/selftests/kvm/include/riscv/processor.h
index b68b1b731a34..bd27e1c67579 100644
--- a/tools/testing/selftests/kvm/include/riscv/processor.h
+++ b/tools/testing/selftests/kvm/include/riscv/processor.h
@@ -42,6 +42,8 @@ static inline uint64_t __kvm_reg_id(uint64_t type, uint64_t idx,
#define RISCV_ISA_EXT_REG(idx) __kvm_reg_id(KVM_REG_RISCV_ISA_EXT, \
idx, KVM_REG_SIZE_ULONG)
+bool __vcpu_has_ext(struct kvm_vcpu *vcpu, int ext);
+
struct ex_regs {
unsigned long ra;
unsigned long sp;
diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
index 39a1e9902dec..dad73ce18164 100644
--- a/tools/testing/selftests/kvm/lib/riscv/processor.c
+++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
@@ -15,6 +15,16 @@
static vm_vaddr_t exception_handlers;
+bool __vcpu_has_ext(struct kvm_vcpu *vcpu, int ext)
+{
+ unsigned long value = 0;
+ int ret;
+
+ ret = __vcpu_get_reg(vcpu, RISCV_ISA_EXT_REG(ext), &value);
+
+ return !ret && !!value;
+}
+
static uint64_t page_align(struct kvm_vm *vm, uint64_t v)
{
return (v + vm->page_size) & ~(vm->page_size - 1);
diff --git a/tools/testing/selftests/kvm/riscv/get-reg-list.c b/tools/testing/selftests/kvm/riscv/get-reg-list.c
index 6bedaea95395..5da230e86728 100644
--- a/tools/testing/selftests/kvm/riscv/get-reg-list.c
+++ b/tools/testing/selftests/kvm/riscv/get-reg-list.c
@@ -75,15 +75,6 @@ bool check_reject_set(int err)
return err == EINVAL;
}
-static inline bool vcpu_has_ext(struct kvm_vcpu *vcpu, int ext)
-{
- int ret;
- unsigned long value;
-
- ret = __vcpu_get_reg(vcpu, RISCV_ISA_EXT_REG(ext), &value);
- return (ret) ? false : !!value;
-}
-
void finalize_vcpu(struct kvm_vcpu *vcpu, struct vcpu_reg_list *c)
{
unsigned long isa_ext_state[KVM_RISCV_ISA_EXT_MAX] = { 0 };
@@ -111,7 +102,7 @@ void finalize_vcpu(struct kvm_vcpu *vcpu, struct vcpu_reg_list *c)
__vcpu_set_reg(vcpu, RISCV_ISA_EXT_REG(s->feature), 1);
/* Double check whether the desired extension was enabled */
- __TEST_REQUIRE(vcpu_has_ext(vcpu, s->feature),
+ __TEST_REQUIRE(__vcpu_has_ext(vcpu, s->feature),
"%s not available, skipping tests\n", s->name);
}
}
--
2.34.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v4 10/11] KVM: riscv: selftests: Add sstc timer test
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
` (8 preceding siblings ...)
2023-12-12 9:31 ` [PATCH v4 09/11] KVM: riscv: selftests: Change vcpu_has_ext to a common function Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-13 14:18 ` Andrew Jones
2023-12-12 9:31 ` [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch " Haibo Xu
10 siblings, 1 reply; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Mayuresh Chitale, Greentime Hu,
Daniel Henrique Barboza, Conor Dooley, Jisheng Zhang, Minda Chen,
Samuel Holland, Sean Christopherson, Peter Xu, Like Xu,
Vipin Sharma, Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
Add a KVM selftests to validate the Sstc timer functionality.
The test was ported from arm64 arch timer test.
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
---
tools/testing/selftests/kvm/Makefile | 1 +
.../selftests/kvm/aarch64/arch_timer.c | 12 +-
tools/testing/selftests/kvm/arch_timer.c | 10 +-
.../selftests/kvm/include/riscv/arch_timer.h | 71 ++++++++++++
.../selftests/kvm/include/riscv/processor.h | 10 ++
.../selftests/kvm/include/timer_test.h | 5 +-
.../testing/selftests/kvm/riscv/arch_timer.c | 107 ++++++++++++++++++
7 files changed, 206 insertions(+), 10 deletions(-)
create mode 100644 tools/testing/selftests/kvm/include/riscv/arch_timer.h
create mode 100644 tools/testing/selftests/kvm/riscv/arch_timer.c
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 671224c4b9e0..eb8071aba80a 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -193,6 +193,7 @@ TEST_GEN_PROGS_s390x += rseq_test
TEST_GEN_PROGS_s390x += set_memory_region_test
TEST_GEN_PROGS_s390x += kvm_binary_stats_test
+TEST_GEN_PROGS_riscv += arch_timer
TEST_GEN_PROGS_riscv += demand_paging_test
TEST_GEN_PROGS_riscv += dirty_log_test
TEST_GEN_PROGS_riscv += guest_print_test
diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
index 6fb47ba07e5b..4b421d421c3f 100644
--- a/tools/testing/selftests/kvm/aarch64/arch_timer.c
+++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
@@ -190,10 +190,14 @@ struct kvm_vm *test_vm_create(void)
vm_init_descriptor_tables(vm);
vm_install_exception_handler(vm, VECTOR_IRQ_CURRENT, guest_irq_handler);
- if (!test_args.offset.reserved) {
- if (kvm_has_cap(KVM_CAP_COUNTER_OFFSET))
- vm_ioctl(vm, KVM_ARM_SET_COUNTER_OFFSET, &test_args.offset);
- else
+ if (!test_args.reserved) {
+ if (kvm_has_cap(KVM_CAP_COUNTER_OFFSET)) {
+ struct kvm_arm_counter_offset offset = {
+ .counter_offset = test_args.counter_offset,
+ .reserved = 0,
+ };
+ vm_ioctl(vm, KVM_ARM_SET_COUNTER_OFFSET, &offset);
+ } else
TEST_FAIL("no support for global offset\n");
}
diff --git a/tools/testing/selftests/kvm/arch_timer.c b/tools/testing/selftests/kvm/arch_timer.c
index 6e442dbcfc8b..60963fce16f2 100644
--- a/tools/testing/selftests/kvm/arch_timer.c
+++ b/tools/testing/selftests/kvm/arch_timer.c
@@ -34,7 +34,7 @@ struct test_args test_args = {
.nr_iter = NR_TEST_ITERS_DEF,
.timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
.migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
- .offset = { .reserved = 1 },
+ .reserved = 1,
};
struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
@@ -73,6 +73,8 @@ static void *test_vcpu_run(void *arg)
TEST_FAIL("Unexpected guest exit\n");
}
+ pr_info("PASS(vCPU-%d).\n", vcpu_idx);
+
return NULL;
}
@@ -187,7 +189,7 @@ static void test_print_help(char *name)
TIMER_TEST_PERIOD_MS_DEF);
pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
TIMER_TEST_MIGRATION_FREQ_MS);
- pr_info("\t-o: Counter offset (in counter cycles, default: 0)\n");
+ pr_info("\t-o: Counter offset (in counter cycles, default: 0) [aarch64-only]\n");
pr_info("\t-h: print this help screen\n");
}
@@ -215,8 +217,8 @@ static bool parse_args(int argc, char *argv[])
test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
break;
case 'o':
- test_args.offset.counter_offset = strtol(optarg, NULL, 0);
- test_args.offset.reserved = 0;
+ test_args.counter_offset = strtol(optarg, NULL, 0);
+ test_args.reserved = 0;
break;
case 'h':
default:
diff --git a/tools/testing/selftests/kvm/include/riscv/arch_timer.h b/tools/testing/selftests/kvm/include/riscv/arch_timer.h
new file mode 100644
index 000000000000..23d4a0e0e1cd
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/riscv/arch_timer.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * RISC-V Arch Timer(sstc) specific interface
+ *
+ * Copyright (c) 2023 Intel Corporation
+ */
+
+#ifndef SELFTEST_KVM_ARCH_TIMER_H
+#define SELFTEST_KVM_ARCH_TIMER_H
+
+#include <asm/csr.h>
+#include <asm/vdso/processor.h>
+
+static unsigned long timer_freq;
+
+#define msec_to_cycles(msec) \
+ ((timer_freq) * (uint64_t)(msec) / 1000)
+
+#define usec_to_cycles(usec) \
+ ((timer_freq) * (uint64_t)(usec) / 1000000)
+
+#define cycles_to_usec(cycles) \
+ ((uint64_t)(cycles) * 1000000 / (timer_freq))
+
+static inline uint64_t timer_get_cycles(void)
+{
+ return csr_read(CSR_TIME);
+}
+
+static inline void timer_set_cmp(uint64_t cval)
+{
+ csr_write(CSR_STIMECMP, cval);
+}
+
+static inline uint64_t timer_get_cmp(void)
+{
+ return csr_read(CSR_STIMECMP);
+}
+
+static inline void timer_irq_enable(void)
+{
+ csr_set(CSR_SIE, IE_TIE);
+}
+
+static inline void timer_irq_disable(void)
+{
+ csr_clear(CSR_SIE, IE_TIE);
+}
+
+static inline void timer_set_next_cmp_ms(uint32_t msec)
+{
+ uint64_t now_ct = timer_get_cycles();
+ uint64_t next_ct = now_ct + msec_to_cycles(msec);
+
+ timer_set_cmp(next_ct);
+}
+
+static inline void __delay(uint64_t cycles)
+{
+ uint64_t start = timer_get_cycles();
+
+ while ((timer_get_cycles() - start) < cycles)
+ cpu_relax();
+}
+
+static inline void udelay(unsigned long usec)
+{
+ __delay(usec_to_cycles(usec));
+}
+
+#endif /* SELFTEST_KVM_ARCH_TIMER_H */
diff --git a/tools/testing/selftests/kvm/include/riscv/processor.h b/tools/testing/selftests/kvm/include/riscv/processor.h
index bd27e1c67579..3e7f6b369a5e 100644
--- a/tools/testing/selftests/kvm/include/riscv/processor.h
+++ b/tools/testing/selftests/kvm/include/riscv/processor.h
@@ -158,4 +158,14 @@ struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
unsigned long arg3, unsigned long arg4,
unsigned long arg5);
+static inline void local_irq_enable(void)
+{
+ csr_set(CSR_SSTATUS, SR_SIE);
+}
+
+static inline void local_irq_disable(void)
+{
+ csr_clear(CSR_SSTATUS, SR_SIE);
+}
+
#endif /* SELFTEST_KVM_PROCESSOR_H */
diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
index 2234c513b510..968257b893a7 100644
--- a/tools/testing/selftests/kvm/include/timer_test.h
+++ b/tools/testing/selftests/kvm/include/timer_test.h
@@ -22,8 +22,9 @@ struct test_args {
int nr_iter;
int timer_period_ms;
int migration_freq_ms;
- /* TODO: Change arm specific type to a common one */
- struct kvm_arm_counter_offset offset;
+ /* Members of struct kvm_arm_counter_offset */
+ uint64_t counter_offset;
+ uint64_t reserved;
};
/* Shared variables between host and guest */
diff --git a/tools/testing/selftests/kvm/riscv/arch_timer.c b/tools/testing/selftests/kvm/riscv/arch_timer.c
new file mode 100644
index 000000000000..13bf184d1ff5
--- /dev/null
+++ b/tools/testing/selftests/kvm/riscv/arch_timer.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch_timer.c - Tests the riscv64 sstc timer IRQ functionality
+ *
+ * The test validates the sstc timer IRQs using vstimecmp registers.
+ * It's ported from the aarch64 arch_timer test.
+ *
+ * Copyright (c) 2023, Intel Corporation.
+ */
+
+#define _GNU_SOURCE
+
+#include "arch_timer.h"
+#include "kvm_util.h"
+#include "processor.h"
+#include "timer_test.h"
+
+static int timer_irq = IRQ_S_TIMER;
+
+static void guest_irq_handler(struct ex_regs *regs)
+{
+ uint64_t xcnt, xcnt_diff_us, cmp;
+ unsigned int intid = regs->cause & ~CAUSE_IRQ_FLAG;
+ uint32_t cpu = guest_get_vcpuid();
+ struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+ timer_irq_disable();
+
+ xcnt = timer_get_cycles();
+ cmp = timer_get_cmp();
+ xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt);
+
+ /* Make sure we are dealing with the correct timer IRQ */
+ GUEST_ASSERT_EQ(intid, timer_irq);
+
+ __GUEST_ASSERT(xcnt >= cmp,
+ "xcnt = 0x%llx, cmp = 0x%llx, xcnt_diff_us = 0x%llx",
+ xcnt, cmp, xcnt_diff_us);
+
+ WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1);
+}
+
+static void guest_run(struct test_vcpu_shared_data *shared_data)
+{
+ uint32_t irq_iter, config_iter;
+
+ shared_data->nr_iter = 0;
+ shared_data->guest_stage = 0;
+
+ for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
+ /* Setup the next interrupt */
+ timer_set_next_cmp_ms(test_args.timer_period_ms);
+ shared_data->xcnt = timer_get_cycles();
+ timer_irq_enable();
+
+ /* Setup a timeout for the interrupt to arrive */
+ udelay(msecs_to_usecs(test_args.timer_period_ms) +
+ TIMER_TEST_ERR_MARGIN_US);
+
+ irq_iter = READ_ONCE(shared_data->nr_iter);
+ GUEST_ASSERT_EQ(config_iter + 1, irq_iter);
+ }
+}
+
+static void guest_code(void)
+{
+ uint32_t cpu = guest_get_vcpuid();
+ struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
+
+ timer_irq_disable();
+ local_irq_enable();
+
+ guest_run(shared_data);
+
+ GUEST_DONE();
+}
+
+struct kvm_vm *test_vm_create(void)
+{
+ struct kvm_vm *vm;
+ int nr_vcpus = test_args.nr_vcpus;
+
+ vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus);
+ __TEST_REQUIRE(__vcpu_has_ext(vcpus[0], KVM_RISCV_ISA_EXT_SSTC),
+ "SSTC not available, skipping test\n");
+
+ vm_init_vector_tables(vm);
+ vm_install_interrupt_handler(vm, guest_irq_handler);
+
+ for (int i = 0; i < nr_vcpus; i++)
+ vcpu_init_vector_tables(vcpus[i]);
+
+ /* Initialize guest timer frequency. */
+ vcpu_get_reg(vcpus[0], RISCV_TIMER_REG(frequency), &timer_freq);
+ sync_global_to_guest(vm, timer_freq);
+ pr_debug("timer_freq: %lu\n", timer_freq);
+
+ /* Make all the test's cmdline args visible to the guest */
+ sync_global_to_guest(vm, test_args);
+
+ return vm;
+}
+
+void test_vm_cleanup(struct kvm_vm *vm)
+{
+ kvm_vm_free(vm);
+}
--
2.34.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v4 10/11] KVM: riscv: selftests: Add sstc timer test
2023-12-12 9:31 ` [PATCH v4 10/11] KVM: riscv: selftests: Add sstc timer test Haibo Xu
@ 2023-12-13 14:18 ` Andrew Jones
0 siblings, 0 replies; 28+ messages in thread
From: Andrew Jones @ 2023-12-13 14:18 UTC (permalink / raw)
To: Haibo Xu
Cc: xiaobo55x, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Mayuresh Chitale, Greentime Hu,
Daniel Henrique Barboza, Conor Dooley, Jisheng Zhang, Minda Chen,
Samuel Holland, Sean Christopherson, Peter Xu, Like Xu,
Vipin Sharma, Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
On Tue, Dec 12, 2023 at 05:31:19PM +0800, Haibo Xu wrote:
> Add a KVM selftests to validate the Sstc timer functionality.
> The test was ported from arm64 arch timer test.
>
> Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
> ---
> tools/testing/selftests/kvm/Makefile | 1 +
> .../selftests/kvm/aarch64/arch_timer.c | 12 +-
> tools/testing/selftests/kvm/arch_timer.c | 10 +-
> .../selftests/kvm/include/riscv/arch_timer.h | 71 ++++++++++++
> .../selftests/kvm/include/riscv/processor.h | 10 ++
> .../selftests/kvm/include/timer_test.h | 5 +-
> .../testing/selftests/kvm/riscv/arch_timer.c | 107 ++++++++++++++++++
> 7 files changed, 206 insertions(+), 10 deletions(-)
> create mode 100644 tools/testing/selftests/kvm/include/riscv/arch_timer.h
> create mode 100644 tools/testing/selftests/kvm/riscv/arch_timer.c
>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-12 9:31 [PATCH v4 00/11] RISCV: Add kvm Sstc timer selftests Haibo Xu
` (9 preceding siblings ...)
2023-12-12 9:31 ` [PATCH v4 10/11] KVM: riscv: selftests: Add sstc timer test Haibo Xu
@ 2023-12-12 9:31 ` Haibo Xu
2023-12-13 14:27 ` Andrew Jones
` (2 more replies)
10 siblings, 3 replies; 28+ messages in thread
From: Haibo Xu @ 2023-12-12 9:31 UTC (permalink / raw)
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Mayuresh Chitale, Greentime Hu, wchen,
Conor Dooley, Heiko Stuebner, Minda Chen, Samuel Holland,
Jisheng Zhang, Sean Christopherson, Peter Xu, Like Xu,
Vipin Sharma, Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
There are intermittent failures occured when stressing the
arch-timer test in a Qemu VM:
Guest assert failed, vcpu 0; stage; 4; iter: 3
==== Test Assertion Failure ====
aarch64/arch_timer.c:196: config_iter + 1 == irq_iter
pid=4048 tid=4049 errno=4 - Interrupted system call
1 0x000000000040253b: test_vcpu_run at arch_timer.c:248
2 0x0000ffffb60dd5c7: ?? ??:0
3 0x0000ffffb6145d1b: ?? ??:0
0x3 != 0x2 (config_iter + 1 != irq_iter)e
Further test and debug show that the timeout for an interrupt
to arrive do have random high fluctuation, espectially when
testing in an virtual environment.
To alleviate this issue, just expose the timeout value as user
configurable and print some hint message to increase the value
when hitting the failure..
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
---
.../selftests/kvm/aarch64/arch_timer.c | 8 +++++--
tools/testing/selftests/kvm/arch_timer.c | 22 +++++++++++++------
.../selftests/kvm/include/timer_test.h | 1 +
.../testing/selftests/kvm/riscv/arch_timer.c | 8 +++++--
4 files changed, 28 insertions(+), 11 deletions(-)
diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
index 4b421d421c3f..139eecbf77e7 100644
--- a/tools/testing/selftests/kvm/aarch64/arch_timer.c
+++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
@@ -131,10 +131,14 @@ static void guest_run_stage(struct test_vcpu_shared_data *shared_data,
/* Setup a timeout for the interrupt to arrive */
udelay(msecs_to_usecs(test_args.timer_period_ms) +
- TIMER_TEST_ERR_MARGIN_US);
+ test_args.timer_err_margin_us);
irq_iter = READ_ONCE(shared_data->nr_iter);
- GUEST_ASSERT_EQ(config_iter + 1, irq_iter);
+ __GUEST_ASSERT(config_iter + 1 == irq_iter,
+ "config_iter + 1 = 0x%lx, irq_iter = 0x%lx.\n"
+ " Guest timer interrupt was not trigged within the specified\n"
+ " interval, try to increase the error margin by [-e] option.\n",
+ config_iter + 1, irq_iter);
}
}
diff --git a/tools/testing/selftests/kvm/arch_timer.c b/tools/testing/selftests/kvm/arch_timer.c
index 60963fce16f2..5050022fd345 100644
--- a/tools/testing/selftests/kvm/arch_timer.c
+++ b/tools/testing/selftests/kvm/arch_timer.c
@@ -5,16 +5,17 @@
* The guest's main thread configures the timer interrupt and waits
* for it to fire, with a timeout equal to the timer period.
* It asserts that the timeout doesn't exceed the timer period plus
- * an error margin of 100us.
+ * an user configurable error margin(default to 100us).
*
* On the other hand, upon receipt of an interrupt, the guest's interrupt
* handler validates the interrupt by checking if the architectural state
* is in compliance with the specifications.
*
* The test provides command-line options to configure the timer's
- * period (-p), number of vCPUs (-n), and iterations per stage (-i).
- * To stress-test the timer stack even more, an option to migrate the
- * vCPUs across pCPUs (-m), at a particular rate, is also provided.
+ * period (-p), number of vCPUs (-n), iterations per stage (-i), and timer
+ * interrupt arrival error margin (-e). To stress-test the timer stack even
+ * more, an option to migrate the vCPUs across pCPUs (-m), at a particular
+ * rate, is also provided.
*
* Copyright (c) 2021, Google LLC.
*/
@@ -34,6 +35,7 @@ struct test_args test_args = {
.nr_iter = NR_TEST_ITERS_DEF,
.timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
.migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
+ .timer_err_margin_us = TIMER_TEST_ERR_MARGIN_US,
.reserved = 1,
};
@@ -179,8 +181,9 @@ static void test_run(struct kvm_vm *vm)
static void test_print_help(char *name)
{
- pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
- name);
+ pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n"
+ "\t\t [-m migration_freq_ms] [-o counter_offset]\n"
+ "\t\t [-e timer_err_margin_us]\n", name);
pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
NR_VCPUS_DEF, KVM_MAX_VCPUS);
pr_info("\t-i: Number of iterations per stage (default: %u)\n",
@@ -190,6 +193,8 @@ static void test_print_help(char *name)
pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
TIMER_TEST_MIGRATION_FREQ_MS);
pr_info("\t-o: Counter offset (in counter cycles, default: 0) [aarch64-only]\n");
+ pr_info("\t-e: Interrupt arrival error margin(in us) of the guest timer (default: %u)\n",
+ TIMER_TEST_ERR_MARGIN_US);
pr_info("\t-h: print this help screen\n");
}
@@ -197,7 +202,7 @@ static bool parse_args(int argc, char *argv[])
{
int opt;
- while ((opt = getopt(argc, argv, "hn:i:p:m:o:")) != -1) {
+ while ((opt = getopt(argc, argv, "hn:i:p:m:o:e:")) != -1) {
switch (opt) {
case 'n':
test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
@@ -216,6 +221,9 @@ static bool parse_args(int argc, char *argv[])
case 'm':
test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
break;
+ case 'e':
+ test_args.timer_err_margin_us = atoi_non_negative("Error Margin", optarg);
+ break;
case 'o':
test_args.counter_offset = strtol(optarg, NULL, 0);
test_args.reserved = 0;
diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
index 968257b893a7..b1d405e7157d 100644
--- a/tools/testing/selftests/kvm/include/timer_test.h
+++ b/tools/testing/selftests/kvm/include/timer_test.h
@@ -22,6 +22,7 @@ struct test_args {
int nr_iter;
int timer_period_ms;
int migration_freq_ms;
+ int timer_err_margin_us;
/* Members of struct kvm_arm_counter_offset */
uint64_t counter_offset;
uint64_t reserved;
diff --git a/tools/testing/selftests/kvm/riscv/arch_timer.c b/tools/testing/selftests/kvm/riscv/arch_timer.c
index 13bf184d1ff5..45a139dc7ce3 100644
--- a/tools/testing/selftests/kvm/riscv/arch_timer.c
+++ b/tools/testing/selftests/kvm/riscv/arch_timer.c
@@ -55,10 +55,14 @@ static void guest_run(struct test_vcpu_shared_data *shared_data)
/* Setup a timeout for the interrupt to arrive */
udelay(msecs_to_usecs(test_args.timer_period_ms) +
- TIMER_TEST_ERR_MARGIN_US);
+ test_args.timer_err_margin_us);
irq_iter = READ_ONCE(shared_data->nr_iter);
- GUEST_ASSERT_EQ(config_iter + 1, irq_iter);
+ __GUEST_ASSERT(config_iter + 1 == irq_iter,
+ "config_iter + 1 = 0x%lx, irq_iter = 0x%lx.\n"
+ " Guest timer interrupt was not trigged within the specified\n"
+ " interval, try to increase the error margin by [-e] option.\n",
+ config_iter + 1, irq_iter);
}
}
--
2.34.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-12 9:31 ` [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch " Haibo Xu
@ 2023-12-13 14:27 ` Andrew Jones
2023-12-14 6:44 ` Anup Patel
2023-12-19 18:22 ` Marc Zyngier
2 siblings, 0 replies; 28+ messages in thread
From: Andrew Jones @ 2023-12-13 14:27 UTC (permalink / raw)
To: Haibo Xu
Cc: xiaobo55x, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Marc Zyngier, Oliver Upton,
James Morse, Suzuki K Poulose, Zenghui Yu, Anup Patel,
Atish Patra, Guo Ren, Mayuresh Chitale, Greentime Hu, wchen,
Conor Dooley, Heiko Stuebner, Minda Chen, Samuel Holland,
Jisheng Zhang, Sean Christopherson, Peter Xu, Like Xu,
Vipin Sharma, Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth,
linux-kernel, linux-riscv, kvm, linux-kselftest, linux-arm-kernel,
kvmarm, kvm-riscv
On Tue, Dec 12, 2023 at 05:31:20PM +0800, Haibo Xu wrote:
> There are intermittent failures occured when stressing the
> arch-timer test in a Qemu VM:
>
> Guest assert failed, vcpu 0; stage; 4; iter: 3
> ==== Test Assertion Failure ====
> aarch64/arch_timer.c:196: config_iter + 1 == irq_iter
> pid=4048 tid=4049 errno=4 - Interrupted system call
> 1 0x000000000040253b: test_vcpu_run at arch_timer.c:248
> 2 0x0000ffffb60dd5c7: ?? ??:0
> 3 0x0000ffffb6145d1b: ?? ??:0
> 0x3 != 0x2 (config_iter + 1 != irq_iter)e
>
> Further test and debug show that the timeout for an interrupt
> to arrive do have random high fluctuation, espectially when
> testing in an virtual environment.
>
> To alleviate this issue, just expose the timeout value as user
> configurable and print some hint message to increase the value
> when hitting the failure..
>
> Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
> ---
> .../selftests/kvm/aarch64/arch_timer.c | 8 +++++--
> tools/testing/selftests/kvm/arch_timer.c | 22 +++++++++++++------
> .../selftests/kvm/include/timer_test.h | 1 +
> .../testing/selftests/kvm/riscv/arch_timer.c | 8 +++++--
> 4 files changed, 28 insertions(+), 11 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
> index 4b421d421c3f..139eecbf77e7 100644
> --- a/tools/testing/selftests/kvm/aarch64/arch_timer.c
> +++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
> @@ -131,10 +131,14 @@ static void guest_run_stage(struct test_vcpu_shared_data *shared_data,
>
> /* Setup a timeout for the interrupt to arrive */
> udelay(msecs_to_usecs(test_args.timer_period_ms) +
> - TIMER_TEST_ERR_MARGIN_US);
> + test_args.timer_err_margin_us);
>
> irq_iter = READ_ONCE(shared_data->nr_iter);
> - GUEST_ASSERT_EQ(config_iter + 1, irq_iter);
> + __GUEST_ASSERT(config_iter + 1 == irq_iter,
> + "config_iter + 1 = 0x%lx, irq_iter = 0x%lx.\n"
> + " Guest timer interrupt was not trigged within the specified\n"
> + " interval, try to increase the error margin by [-e] option.\n",
> + config_iter + 1, irq_iter);
> }
> }
>
> diff --git a/tools/testing/selftests/kvm/arch_timer.c b/tools/testing/selftests/kvm/arch_timer.c
> index 60963fce16f2..5050022fd345 100644
> --- a/tools/testing/selftests/kvm/arch_timer.c
> +++ b/tools/testing/selftests/kvm/arch_timer.c
> @@ -5,16 +5,17 @@
> * The guest's main thread configures the timer interrupt and waits
> * for it to fire, with a timeout equal to the timer period.
> * It asserts that the timeout doesn't exceed the timer period plus
> - * an error margin of 100us.
> + * an user configurable error margin(default to 100us).
> *
> * On the other hand, upon receipt of an interrupt, the guest's interrupt
> * handler validates the interrupt by checking if the architectural state
> * is in compliance with the specifications.
> *
> * The test provides command-line options to configure the timer's
> - * period (-p), number of vCPUs (-n), and iterations per stage (-i).
> - * To stress-test the timer stack even more, an option to migrate the
> - * vCPUs across pCPUs (-m), at a particular rate, is also provided.
> + * period (-p), number of vCPUs (-n), iterations per stage (-i), and timer
> + * interrupt arrival error margin (-e). To stress-test the timer stack even
> + * more, an option to migrate the vCPUs across pCPUs (-m), at a particular
> + * rate, is also provided.
> *
> * Copyright (c) 2021, Google LLC.
> */
> @@ -34,6 +35,7 @@ struct test_args test_args = {
> .nr_iter = NR_TEST_ITERS_DEF,
> .timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
> .migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
> + .timer_err_margin_us = TIMER_TEST_ERR_MARGIN_US,
> .reserved = 1,
> };
>
> @@ -179,8 +181,9 @@ static void test_run(struct kvm_vm *vm)
>
> static void test_print_help(char *name)
> {
> - pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
> - name);
> + pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n"
> + "\t\t [-m migration_freq_ms] [-o counter_offset]\n"
> + "\t\t [-e timer_err_margin_us]\n", name);
> pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
> NR_VCPUS_DEF, KVM_MAX_VCPUS);
> pr_info("\t-i: Number of iterations per stage (default: %u)\n",
> @@ -190,6 +193,8 @@ static void test_print_help(char *name)
> pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
> TIMER_TEST_MIGRATION_FREQ_MS);
> pr_info("\t-o: Counter offset (in counter cycles, default: 0) [aarch64-only]\n");
> + pr_info("\t-e: Interrupt arrival error margin(in us) of the guest timer (default: %u)\n",
^ need space here
> + TIMER_TEST_ERR_MARGIN_US);
> pr_info("\t-h: print this help screen\n");
> }
>
> @@ -197,7 +202,7 @@ static bool parse_args(int argc, char *argv[])
> {
> int opt;
>
> - while ((opt = getopt(argc, argv, "hn:i:p:m:o:")) != -1) {
> + while ((opt = getopt(argc, argv, "hn:i:p:m:o:e:")) != -1) {
> switch (opt) {
> case 'n':
> test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
> @@ -216,6 +221,9 @@ static bool parse_args(int argc, char *argv[])
> case 'm':
> test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
> break;
> + case 'e':
> + test_args.timer_err_margin_us = atoi_non_negative("Error Margin", optarg);
> + break;
> case 'o':
> test_args.counter_offset = strtol(optarg, NULL, 0);
> test_args.reserved = 0;
> diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> index 968257b893a7..b1d405e7157d 100644
> --- a/tools/testing/selftests/kvm/include/timer_test.h
> +++ b/tools/testing/selftests/kvm/include/timer_test.h
> @@ -22,6 +22,7 @@ struct test_args {
> int nr_iter;
> int timer_period_ms;
> int migration_freq_ms;
> + int timer_err_margin_us;
> /* Members of struct kvm_arm_counter_offset */
> uint64_t counter_offset;
> uint64_t reserved;
> diff --git a/tools/testing/selftests/kvm/riscv/arch_timer.c b/tools/testing/selftests/kvm/riscv/arch_timer.c
> index 13bf184d1ff5..45a139dc7ce3 100644
> --- a/tools/testing/selftests/kvm/riscv/arch_timer.c
> +++ b/tools/testing/selftests/kvm/riscv/arch_timer.c
> @@ -55,10 +55,14 @@ static void guest_run(struct test_vcpu_shared_data *shared_data)
>
> /* Setup a timeout for the interrupt to arrive */
> udelay(msecs_to_usecs(test_args.timer_period_ms) +
> - TIMER_TEST_ERR_MARGIN_US);
> + test_args.timer_err_margin_us);
>
> irq_iter = READ_ONCE(shared_data->nr_iter);
> - GUEST_ASSERT_EQ(config_iter + 1, irq_iter);
> + __GUEST_ASSERT(config_iter + 1 == irq_iter,
> + "config_iter + 1 = 0x%lx, irq_iter = 0x%lx.\n"
> + " Guest timer interrupt was not trigged within the specified\n"
> + " interval, try to increase the error margin by [-e] option.\n",
> + config_iter + 1, irq_iter);
> }
> }
>
> --
> 2.34.1
>
I probably would have started the series with this patch since you said
you could reproduce the problem on aarch64. Starting the series with
this patch would allow just this patch to get picked up to fix aarch64,
if that's necessary, and also avoids touching a couple places twice
with the code split for riscv.
But anyway, other than the missing space in the help text,
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Thanks,
drew
_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-12 9:31 ` [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch " Haibo Xu
2023-12-13 14:27 ` Andrew Jones
@ 2023-12-14 6:44 ` Anup Patel
2023-12-19 18:22 ` Marc Zyngier
2 siblings, 0 replies; 28+ messages in thread
From: Anup Patel @ 2023-12-14 6:44 UTC (permalink / raw)
To: Marc Zyngier, Oliver Upton
Cc: xiaobo55x, haibo1.xu, ajones, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Paolo Bonzini, Shuah Khan, James Morse,
Suzuki K Poulose, Zenghui Yu, Atish Patra, Guo Ren,
Mayuresh Chitale, Greentime Hu, wchen, Conor Dooley,
Heiko Stuebner, Minda Chen, Samuel Holland, Jisheng Zhang,
Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
Hi Marc, Hi Oliver,
On Tue, Dec 12, 2023 at 2:52 PM Haibo Xu <haibo1.xu@intel.com> wrote:
>
> There are intermittent failures occured when stressing the
> arch-timer test in a Qemu VM:
>
> Guest assert failed, vcpu 0; stage; 4; iter: 3
> ==== Test Assertion Failure ====
> aarch64/arch_timer.c:196: config_iter + 1 == irq_iter
> pid=4048 tid=4049 errno=4 - Interrupted system call
> 1 0x000000000040253b: test_vcpu_run at arch_timer.c:248
> 2 0x0000ffffb60dd5c7: ?? ??:0
> 3 0x0000ffffb6145d1b: ?? ??:0
> 0x3 != 0x2 (config_iter + 1 != irq_iter)e
>
> Further test and debug show that the timeout for an interrupt
> to arrive do have random high fluctuation, espectially when
> testing in an virtual environment.
>
> To alleviate this issue, just expose the timeout value as user
> configurable and print some hint message to increase the value
> when hitting the failure..
>
> Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Can you please review this patch ?
We want to take this entire series through the KVM RISC-V tree.
Regards,
Anup
> ---
> .../selftests/kvm/aarch64/arch_timer.c | 8 +++++--
> tools/testing/selftests/kvm/arch_timer.c | 22 +++++++++++++------
> .../selftests/kvm/include/timer_test.h | 1 +
> .../testing/selftests/kvm/riscv/arch_timer.c | 8 +++++--
> 4 files changed, 28 insertions(+), 11 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c
> index 4b421d421c3f..139eecbf77e7 100644
> --- a/tools/testing/selftests/kvm/aarch64/arch_timer.c
> +++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c
> @@ -131,10 +131,14 @@ static void guest_run_stage(struct test_vcpu_shared_data *shared_data,
>
> /* Setup a timeout for the interrupt to arrive */
> udelay(msecs_to_usecs(test_args.timer_period_ms) +
> - TIMER_TEST_ERR_MARGIN_US);
> + test_args.timer_err_margin_us);
>
> irq_iter = READ_ONCE(shared_data->nr_iter);
> - GUEST_ASSERT_EQ(config_iter + 1, irq_iter);
> + __GUEST_ASSERT(config_iter + 1 == irq_iter,
> + "config_iter + 1 = 0x%lx, irq_iter = 0x%lx.\n"
> + " Guest timer interrupt was not trigged within the specified\n"
> + " interval, try to increase the error margin by [-e] option.\n",
> + config_iter + 1, irq_iter);
> }
> }
>
> diff --git a/tools/testing/selftests/kvm/arch_timer.c b/tools/testing/selftests/kvm/arch_timer.c
> index 60963fce16f2..5050022fd345 100644
> --- a/tools/testing/selftests/kvm/arch_timer.c
> +++ b/tools/testing/selftests/kvm/arch_timer.c
> @@ -5,16 +5,17 @@
> * The guest's main thread configures the timer interrupt and waits
> * for it to fire, with a timeout equal to the timer period.
> * It asserts that the timeout doesn't exceed the timer period plus
> - * an error margin of 100us.
> + * an user configurable error margin(default to 100us).
> *
> * On the other hand, upon receipt of an interrupt, the guest's interrupt
> * handler validates the interrupt by checking if the architectural state
> * is in compliance with the specifications.
> *
> * The test provides command-line options to configure the timer's
> - * period (-p), number of vCPUs (-n), and iterations per stage (-i).
> - * To stress-test the timer stack even more, an option to migrate the
> - * vCPUs across pCPUs (-m), at a particular rate, is also provided.
> + * period (-p), number of vCPUs (-n), iterations per stage (-i), and timer
> + * interrupt arrival error margin (-e). To stress-test the timer stack even
> + * more, an option to migrate the vCPUs across pCPUs (-m), at a particular
> + * rate, is also provided.
> *
> * Copyright (c) 2021, Google LLC.
> */
> @@ -34,6 +35,7 @@ struct test_args test_args = {
> .nr_iter = NR_TEST_ITERS_DEF,
> .timer_period_ms = TIMER_TEST_PERIOD_MS_DEF,
> .migration_freq_ms = TIMER_TEST_MIGRATION_FREQ_MS,
> + .timer_err_margin_us = TIMER_TEST_ERR_MARGIN_US,
> .reserved = 1,
> };
>
> @@ -179,8 +181,9 @@ static void test_run(struct kvm_vm *vm)
>
> static void test_print_help(char *name)
> {
> - pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n",
> - name);
> + pr_info("Usage: %s [-h] [-n nr_vcpus] [-i iterations] [-p timer_period_ms]\n"
> + "\t\t [-m migration_freq_ms] [-o counter_offset]\n"
> + "\t\t [-e timer_err_margin_us]\n", name);
> pr_info("\t-n: Number of vCPUs to configure (default: %u; max: %u)\n",
> NR_VCPUS_DEF, KVM_MAX_VCPUS);
> pr_info("\t-i: Number of iterations per stage (default: %u)\n",
> @@ -190,6 +193,8 @@ static void test_print_help(char *name)
> pr_info("\t-m: Frequency (in ms) of vCPUs to migrate to different pCPU. 0 to turn off (default: %u)\n",
> TIMER_TEST_MIGRATION_FREQ_MS);
> pr_info("\t-o: Counter offset (in counter cycles, default: 0) [aarch64-only]\n");
> + pr_info("\t-e: Interrupt arrival error margin(in us) of the guest timer (default: %u)\n",
> + TIMER_TEST_ERR_MARGIN_US);
> pr_info("\t-h: print this help screen\n");
> }
>
> @@ -197,7 +202,7 @@ static bool parse_args(int argc, char *argv[])
> {
> int opt;
>
> - while ((opt = getopt(argc, argv, "hn:i:p:m:o:")) != -1) {
> + while ((opt = getopt(argc, argv, "hn:i:p:m:o:e:")) != -1) {
> switch (opt) {
> case 'n':
> test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg);
> @@ -216,6 +221,9 @@ static bool parse_args(int argc, char *argv[])
> case 'm':
> test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
> break;
> + case 'e':
> + test_args.timer_err_margin_us = atoi_non_negative("Error Margin", optarg);
> + break;
> case 'o':
> test_args.counter_offset = strtol(optarg, NULL, 0);
> test_args.reserved = 0;
> diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> index 968257b893a7..b1d405e7157d 100644
> --- a/tools/testing/selftests/kvm/include/timer_test.h
> +++ b/tools/testing/selftests/kvm/include/timer_test.h
> @@ -22,6 +22,7 @@ struct test_args {
> int nr_iter;
> int timer_period_ms;
> int migration_freq_ms;
> + int timer_err_margin_us;
> /* Members of struct kvm_arm_counter_offset */
> uint64_t counter_offset;
> uint64_t reserved;
> diff --git a/tools/testing/selftests/kvm/riscv/arch_timer.c b/tools/testing/selftests/kvm/riscv/arch_timer.c
> index 13bf184d1ff5..45a139dc7ce3 100644
> --- a/tools/testing/selftests/kvm/riscv/arch_timer.c
> +++ b/tools/testing/selftests/kvm/riscv/arch_timer.c
> @@ -55,10 +55,14 @@ static void guest_run(struct test_vcpu_shared_data *shared_data)
>
> /* Setup a timeout for the interrupt to arrive */
> udelay(msecs_to_usecs(test_args.timer_period_ms) +
> - TIMER_TEST_ERR_MARGIN_US);
> + test_args.timer_err_margin_us);
>
> irq_iter = READ_ONCE(shared_data->nr_iter);
> - GUEST_ASSERT_EQ(config_iter + 1, irq_iter);
> + __GUEST_ASSERT(config_iter + 1 == irq_iter,
> + "config_iter + 1 = 0x%lx, irq_iter = 0x%lx.\n"
> + " Guest timer interrupt was not trigged within the specified\n"
> + " interval, try to increase the error margin by [-e] option.\n",
> + config_iter + 1, irq_iter);
> }
> }
>
> --
> 2.34.1
>
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-12 9:31 ` [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch " Haibo Xu
2023-12-13 14:27 ` Andrew Jones
2023-12-14 6:44 ` Anup Patel
@ 2023-12-19 18:22 ` Marc Zyngier
2023-12-20 6:50 ` Haibo Xu
2 siblings, 1 reply; 28+ messages in thread
From: Marc Zyngier @ 2023-12-19 18:22 UTC (permalink / raw)
To: Haibo Xu
Cc: xiaobo55x, ajones, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Oliver Upton, James Morse,
Suzuki K Poulose, Zenghui Yu, Anup Patel, Atish Patra, Guo Ren,
Mayuresh Chitale, Greentime Hu, wchen, Conor Dooley,
Heiko Stuebner, Minda Chen, Samuel Holland, Jisheng Zhang,
Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
On Tue, 12 Dec 2023 09:31:20 +0000,
Haibo Xu <haibo1.xu@intel.com> wrote:
> > @@ -216,6 +221,9 @@ static bool parse_args(int argc, char *argv[])
> case 'm':
> test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
> break;
> + case 'e':
> + test_args.timer_err_margin_us = atoi_non_negative("Error Margin", optarg);
> + break;
So your error margin is always unsigned...
> case 'o':
> test_args.counter_offset = strtol(optarg, NULL, 0);
> test_args.reserved = 0;
> diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> index 968257b893a7..b1d405e7157d 100644
> --- a/tools/testing/selftests/kvm/include/timer_test.h
> +++ b/tools/testing/selftests/kvm/include/timer_test.h
> @@ -22,6 +22,7 @@ struct test_args {
> int nr_iter;
> int timer_period_ms;
> int migration_freq_ms;
> + int timer_err_margin_us;
... except that you are storing it as a signed value. Some consistency
wouldn't hurt, really, and would avoid issues when passing large
values.
M.
--
Without deviation from the norm, progress is not possible.
_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-19 18:22 ` Marc Zyngier
@ 2023-12-20 6:50 ` Haibo Xu
2023-12-20 9:00 ` Marc Zyngier
0 siblings, 1 reply; 28+ messages in thread
From: Haibo Xu @ 2023-12-20 6:50 UTC (permalink / raw)
To: Marc Zyngier
Cc: Haibo Xu, ajones, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Oliver Upton, James Morse,
Suzuki K Poulose, Zenghui Yu, Anup Patel, Atish Patra, Guo Ren,
Mayuresh Chitale, Greentime Hu, wchen, Conor Dooley,
Heiko Stuebner, Minda Chen, Samuel Holland, Jisheng Zhang,
Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
On Wed, Dec 20, 2023 at 2:22 AM Marc Zyngier <maz@kernel.org> wrote:
>
> On Tue, 12 Dec 2023 09:31:20 +0000,
> Haibo Xu <haibo1.xu@intel.com> wrote:
> > > @@ -216,6 +221,9 @@ static bool parse_args(int argc, char *argv[])
> > case 'm':
> > test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
> > break;
> > + case 'e':
> > + test_args.timer_err_margin_us = atoi_non_negative("Error Margin", optarg);
> > + break;
>
> So your error margin is always unsigned...
>
The error margin was supposed to be a non-negative [0, INT_MAX].
(May be need to define a Max for the input, instead of INT_MAX)
> > case 'o':
> > test_args.counter_offset = strtol(optarg, NULL, 0);
> > test_args.reserved = 0;
> > diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> > index 968257b893a7..b1d405e7157d 100644
> > --- a/tools/testing/selftests/kvm/include/timer_test.h
> > +++ b/tools/testing/selftests/kvm/include/timer_test.h
> > @@ -22,6 +22,7 @@ struct test_args {
> > int nr_iter;
> > int timer_period_ms;
> > int migration_freq_ms;
> > + int timer_err_margin_us;
>
> ... except that you are storing it as a signed value. Some consistency
> wouldn't hurt, really, and would avoid issues when passing large
> values.
>
Yes, it's more proper to use an unsigned int for the non-negative error margin.
Storing as signed here is just to keep the type consistent with that
of timer_period_ms
since there will be '+' operation in other places.
tools/testing/selftests/kvm/aarch64/arch_timer.c
/* Setup a timeout for the interrupt to arrive */
udelay(msecs_to_usecs(test_args.timer_period_ms) +
test_args.timer_err_margin_us);
Thanks,
Haibo
> M.
>
> --
> Without deviation from the norm, progress is not possible.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-20 6:50 ` Haibo Xu
@ 2023-12-20 9:00 ` Marc Zyngier
2023-12-20 13:51 ` Haibo Xu
0 siblings, 1 reply; 28+ messages in thread
From: Marc Zyngier @ 2023-12-20 9:00 UTC (permalink / raw)
To: Haibo Xu
Cc: Haibo Xu, ajones, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Oliver Upton, James Morse,
Suzuki K Poulose, Zenghui Yu, Anup Patel, Atish Patra, Guo Ren,
Mayuresh Chitale, Greentime Hu, wchen, Conor Dooley,
Heiko Stuebner, Minda Chen, Samuel Holland, Jisheng Zhang,
Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
On 2023-12-20 06:50, Haibo Xu wrote:
> On Wed, Dec 20, 2023 at 2:22 AM Marc Zyngier <maz@kernel.org> wrote:
>>
>> On Tue, 12 Dec 2023 09:31:20 +0000,
>> Haibo Xu <haibo1.xu@intel.com> wrote:
>> > > @@ -216,6 +221,9 @@ static bool parse_args(int argc, char *argv[])
>> > case 'm':
>> > test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
>> > break;
>> > + case 'e':
>> > + test_args.timer_err_margin_us = atoi_non_negative("Error Margin", optarg);
>> > + break;
>>
>> So your error margin is always unsigned...
>>
>
> The error margin was supposed to be a non-negative [0, INT_MAX].
> (May be need to define a Max for the input, instead of INT_MAX)
>
>> > case 'o':
>> > test_args.counter_offset = strtol(optarg, NULL, 0);
>> > test_args.reserved = 0;
>> > diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
>> > index 968257b893a7..b1d405e7157d 100644
>> > --- a/tools/testing/selftests/kvm/include/timer_test.h
>> > +++ b/tools/testing/selftests/kvm/include/timer_test.h
>> > @@ -22,6 +22,7 @@ struct test_args {
>> > int nr_iter;
>> > int timer_period_ms;
>> > int migration_freq_ms;
>> > + int timer_err_margin_us;
>>
>> ... except that you are storing it as a signed value. Some consistency
>> wouldn't hurt, really, and would avoid issues when passing large
>> values.
>>
>
> Yes, it's more proper to use an unsigned int for the non-negative error
> margin.
> Storing as signed here is just to keep the type consistent with that
> of timer_period_ms
> since there will be '+' operation in other places.
>
> tools/testing/selftests/kvm/aarch64/arch_timer.c
> /* Setup a timeout for the interrupt to arrive */
> udelay(msecs_to_usecs(test_args.timer_period_ms) +
> test_args.timer_err_margin_us);
But that's exactly why using a signed quantity is wrong.
What does it mean to have a huge *negative* margin?
I don't see how you can justify this.
M.
--
Jazz is not dead. It just smells funny...
_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-20 9:00 ` Marc Zyngier
@ 2023-12-20 13:51 ` Haibo Xu
2023-12-20 13:58 ` Marc Zyngier
0 siblings, 1 reply; 28+ messages in thread
From: Haibo Xu @ 2023-12-20 13:51 UTC (permalink / raw)
To: Marc Zyngier
Cc: Haibo Xu, ajones, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Oliver Upton, James Morse,
Suzuki K Poulose, Zenghui Yu, Anup Patel, Atish Patra, Guo Ren,
Mayuresh Chitale, Greentime Hu, wchen, Conor Dooley,
Heiko Stuebner, Minda Chen, Samuel Holland, Jisheng Zhang,
Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
On Wed, Dec 20, 2023 at 5:00 PM Marc Zyngier <maz@kernel.org> wrote:
>
> On 2023-12-20 06:50, Haibo Xu wrote:
> > On Wed, Dec 20, 2023 at 2:22 AM Marc Zyngier <maz@kernel.org> wrote:
> >>
> >> On Tue, 12 Dec 2023 09:31:20 +0000,
> >> Haibo Xu <haibo1.xu@intel.com> wrote:
> >> > > @@ -216,6 +221,9 @@ static bool parse_args(int argc, char *argv[])
> >> > case 'm':
> >> > test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg);
> >> > break;
> >> > + case 'e':
> >> > + test_args.timer_err_margin_us = atoi_non_negative("Error Margin", optarg);
> >> > + break;
> >>
> >> So your error margin is always unsigned...
> >>
> >
> > The error margin was supposed to be a non-negative [0, INT_MAX].
> > (May be need to define a Max for the input, instead of INT_MAX)
> >
> >> > case 'o':
> >> > test_args.counter_offset = strtol(optarg, NULL, 0);
> >> > test_args.reserved = 0;
> >> > diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> >> > index 968257b893a7..b1d405e7157d 100644
> >> > --- a/tools/testing/selftests/kvm/include/timer_test.h
> >> > +++ b/tools/testing/selftests/kvm/include/timer_test.h
> >> > @@ -22,6 +22,7 @@ struct test_args {
> >> > int nr_iter;
> >> > int timer_period_ms;
> >> > int migration_freq_ms;
> >> > + int timer_err_margin_us;
> >>
> >> ... except that you are storing it as a signed value. Some consistency
> >> wouldn't hurt, really, and would avoid issues when passing large
> >> values.
> >>
> >
> > Yes, it's more proper to use an unsigned int for the non-negative error
> > margin.
> > Storing as signed here is just to keep the type consistent with that
> > of timer_period_ms
> > since there will be '+' operation in other places.
> >
> > tools/testing/selftests/kvm/aarch64/arch_timer.c
> > /* Setup a timeout for the interrupt to arrive */
> > udelay(msecs_to_usecs(test_args.timer_period_ms) +
> > test_args.timer_err_margin_us);
>
> But that's exactly why using a signed quantity is wrong.
> What does it mean to have a huge *negative* margin?
>
Hi Marc,
I agree that negative values are meaningless for the margin.
If I understand correctly, the negative margin should be filtered by
assertion in atoi_non_negative().
Thanks,
Haibo
> I don't see how you can justify this.
>
> M.
> --
> Jazz is not dead. It just smells funny...
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-20 13:51 ` Haibo Xu
@ 2023-12-20 13:58 ` Marc Zyngier
2023-12-21 2:58 ` Haibo Xu
0 siblings, 1 reply; 28+ messages in thread
From: Marc Zyngier @ 2023-12-20 13:58 UTC (permalink / raw)
To: Haibo Xu
Cc: Haibo Xu, ajones, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Oliver Upton, James Morse,
Suzuki K Poulose, Zenghui Yu, Anup Patel, Atish Patra, Guo Ren,
Mayuresh Chitale, Greentime Hu, wchen, Conor Dooley,
Heiko Stuebner, Minda Chen, Samuel Holland, Jisheng Zhang,
Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
On Wed, 20 Dec 2023 13:51:24 +0000,
Haibo Xu <xiaobo55x@gmail.com> wrote:
>
> On Wed, Dec 20, 2023 at 5:00 PM Marc Zyngier <maz@kernel.org> wrote:
> >
> > On 2023-12-20 06:50, Haibo Xu wrote:
> > > On Wed, Dec 20, 2023 at 2:22 AM Marc Zyngier <maz@kernel.org> wrote:
> > >>
> > >> On Tue, 12 Dec 2023 09:31:20 +0000,
> > >> Haibo Xu <haibo1.xu@intel.com> wrote:
> > >> > diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> > >> > index 968257b893a7..b1d405e7157d 100644
> > >> > --- a/tools/testing/selftests/kvm/include/timer_test.h
> > >> > +++ b/tools/testing/selftests/kvm/include/timer_test.h
> > >> > @@ -22,6 +22,7 @@ struct test_args {
> > >> > int nr_iter;
> > >> > int timer_period_ms;
> > >> > int migration_freq_ms;
> > >> > + int timer_err_margin_us;
> > >>
> > >> ... except that you are storing it as a signed value. Some consistency
> > >> wouldn't hurt, really, and would avoid issues when passing large
> > >> values.
> > >>
> > >
> > > Yes, it's more proper to use an unsigned int for the non-negative error
> > > margin.
> > > Storing as signed here is just to keep the type consistent with that
> > > of timer_period_ms
> > > since there will be '+' operation in other places.
> > >
> > > tools/testing/selftests/kvm/aarch64/arch_timer.c
> > > /* Setup a timeout for the interrupt to arrive */
> > > udelay(msecs_to_usecs(test_args.timer_period_ms) +
> > > test_args.timer_err_margin_us);
> >
> > But that's exactly why using a signed quantity is wrong.
> > What does it mean to have a huge *negative* margin?
> >
>
> Hi Marc,
>
> I agree that negative values are meaningless for the margin.
> If I understand correctly, the negative margin should be filtered by
> assertion in atoi_non_negative().
No. Please.
atoi_non_negative() returns a uint32_t, which is what it should do.
The bug is squarely in the use of an 'int' to store such value, and it
is the *storage* that turns a positive value into a negative one.
M.
--
Without deviation from the norm, progress is not possible.
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-20 13:58 ` Marc Zyngier
@ 2023-12-21 2:58 ` Haibo Xu
2023-12-21 9:25 ` Marc Zyngier
2024-01-04 11:09 ` Andrew Jones
0 siblings, 2 replies; 28+ messages in thread
From: Haibo Xu @ 2023-12-21 2:58 UTC (permalink / raw)
To: Marc Zyngier
Cc: Haibo Xu, ajones, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Oliver Upton, James Morse,
Suzuki K Poulose, Zenghui Yu, Anup Patel, Atish Patra, Guo Ren,
Mayuresh Chitale, Greentime Hu, wchen, Conor Dooley,
Heiko Stuebner, Minda Chen, Samuel Holland, Jisheng Zhang,
Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
On Wed, Dec 20, 2023 at 9:58 PM Marc Zyngier <maz@kernel.org> wrote:
>
> On Wed, 20 Dec 2023 13:51:24 +0000,
> Haibo Xu <xiaobo55x@gmail.com> wrote:
> >
> > On Wed, Dec 20, 2023 at 5:00 PM Marc Zyngier <maz@kernel.org> wrote:
> > >
> > > On 2023-12-20 06:50, Haibo Xu wrote:
> > > > On Wed, Dec 20, 2023 at 2:22 AM Marc Zyngier <maz@kernel.org> wrote:
> > > >>
> > > >> On Tue, 12 Dec 2023 09:31:20 +0000,
> > > >> Haibo Xu <haibo1.xu@intel.com> wrote:
> > > >> > diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> > > >> > index 968257b893a7..b1d405e7157d 100644
> > > >> > --- a/tools/testing/selftests/kvm/include/timer_test.h
> > > >> > +++ b/tools/testing/selftests/kvm/include/timer_test.h
> > > >> > @@ -22,6 +22,7 @@ struct test_args {
> > > >> > int nr_iter;
> > > >> > int timer_period_ms;
> > > >> > int migration_freq_ms;
> > > >> > + int timer_err_margin_us;
> > > >>
> > > >> ... except that you are storing it as a signed value. Some consistency
> > > >> wouldn't hurt, really, and would avoid issues when passing large
> > > >> values.
> > > >>
> > > >
> > > > Yes, it's more proper to use an unsigned int for the non-negative error
> > > > margin.
> > > > Storing as signed here is just to keep the type consistent with that
> > > > of timer_period_ms
> > > > since there will be '+' operation in other places.
> > > >
> > > > tools/testing/selftests/kvm/aarch64/arch_timer.c
> > > > /* Setup a timeout for the interrupt to arrive */
> > > > udelay(msecs_to_usecs(test_args.timer_period_ms) +
> > > > test_args.timer_err_margin_us);
> > >
> > > But that's exactly why using a signed quantity is wrong.
> > > What does it mean to have a huge *negative* margin?
> > >
> >
> > Hi Marc,
> >
> > I agree that negative values are meaningless for the margin.
> > If I understand correctly, the negative margin should be filtered by
> > assertion in atoi_non_negative().
>
> No. Please.
>
> atoi_non_negative() returns a uint32_t, which is what it should do.
> The bug is squarely in the use of an 'int' to store such value, and it
> is the *storage* that turns a positive value into a negative one.
>
Thanks for the detailed info!
May I understand that your concern is mainly for a platform with 64bit int type,
which may trigger the positive to negative convert?
If so, I think we may need to do a clean up for the test code since
several other
places have the same issue.
Regards,
Haibo
> M.
>
> --
> Without deviation from the norm, progress is not possible.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-21 2:58 ` Haibo Xu
@ 2023-12-21 9:25 ` Marc Zyngier
2024-01-04 11:09 ` Andrew Jones
1 sibling, 0 replies; 28+ messages in thread
From: Marc Zyngier @ 2023-12-21 9:25 UTC (permalink / raw)
To: Haibo Xu
Cc: Haibo Xu, ajones, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Oliver Upton, James Morse,
Suzuki K Poulose, Zenghui Yu, Anup Patel, Atish Patra, Guo Ren,
Mayuresh Chitale, Greentime Hu, wchen, Conor Dooley,
Heiko Stuebner, Minda Chen, Samuel Holland, Jisheng Zhang,
Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
On Thu, 21 Dec 2023 02:58:40 +0000,
Haibo Xu <xiaobo55x@gmail.com> wrote:
>
> On Wed, Dec 20, 2023 at 9:58 PM Marc Zyngier <maz@kernel.org> wrote:
> >
> > On Wed, 20 Dec 2023 13:51:24 +0000,
> > Haibo Xu <xiaobo55x@gmail.com> wrote:
> > >
> > > On Wed, Dec 20, 2023 at 5:00 PM Marc Zyngier <maz@kernel.org> wrote:
> > > >
> > > > On 2023-12-20 06:50, Haibo Xu wrote:
> > > > > On Wed, Dec 20, 2023 at 2:22 AM Marc Zyngier <maz@kernel.org> wrote:
> > > > >>
> > > > >> On Tue, 12 Dec 2023 09:31:20 +0000,
> > > > >> Haibo Xu <haibo1.xu@intel.com> wrote:
> > > > >> > diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> > > > >> > index 968257b893a7..b1d405e7157d 100644
> > > > >> > --- a/tools/testing/selftests/kvm/include/timer_test.h
> > > > >> > +++ b/tools/testing/selftests/kvm/include/timer_test.h
> > > > >> > @@ -22,6 +22,7 @@ struct test_args {
> > > > >> > int nr_iter;
> > > > >> > int timer_period_ms;
> > > > >> > int migration_freq_ms;
> > > > >> > + int timer_err_margin_us;
> > > > >>
> > > > >> ... except that you are storing it as a signed value. Some consistency
> > > > >> wouldn't hurt, really, and would avoid issues when passing large
> > > > >> values.
> > > > >>
> > > > >
> > > > > Yes, it's more proper to use an unsigned int for the non-negative error
> > > > > margin.
> > > > > Storing as signed here is just to keep the type consistent with that
> > > > > of timer_period_ms
> > > > > since there will be '+' operation in other places.
> > > > >
> > > > > tools/testing/selftests/kvm/aarch64/arch_timer.c
> > > > > /* Setup a timeout for the interrupt to arrive */
> > > > > udelay(msecs_to_usecs(test_args.timer_period_ms) +
> > > > > test_args.timer_err_margin_us);
> > > >
> > > > But that's exactly why using a signed quantity is wrong.
> > > > What does it mean to have a huge *negative* margin?
> > > >
> > >
> > > Hi Marc,
> > >
> > > I agree that negative values are meaningless for the margin.
> > > If I understand correctly, the negative margin should be filtered by
> > > assertion in atoi_non_negative().
> >
> > No. Please.
> >
> > atoi_non_negative() returns a uint32_t, which is what it should do.
> > The bug is squarely in the use of an 'int' to store such value, and it
> > is the *storage* that turns a positive value into a negative one.
> >
>
> Thanks for the detailed info!
>
> May I understand that your concern is mainly for a platform with
> 64bit int type, which may trigger the positive to negative convert?
No. It specifically applies to architectures with a 32bit int type,
which is... *EVERYTHING*. Here's a basic example:
<quote>
#include <stdio.h>
int main(int argc, char *argv[])
{
int x = 1U << 31;
printf("%d (%d)\n", x, sizeof(x));
return 0;
}
</quote>
which returns "-2147483648 (4)" on any platform.
This really is basic C, and I am very worried that you don't see the
issue. I strongly suggest that you go and read about the C type system
before touching this code.
M.
--
Without deviation from the norm, progress is not possible.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: Re: [PATCH v4 11/11] KVM: selftests: Enable tunning of err_margin_us in arch timer test
2023-12-21 2:58 ` Haibo Xu
2023-12-21 9:25 ` Marc Zyngier
@ 2024-01-04 11:09 ` Andrew Jones
1 sibling, 0 replies; 28+ messages in thread
From: Andrew Jones @ 2024-01-04 11:09 UTC (permalink / raw)
To: Haibo Xu
Cc: Marc Zyngier, Haibo Xu, Paul Walmsley, Palmer Dabbelt, Albert Ou,
Paolo Bonzini, Shuah Khan, Oliver Upton, James Morse,
Suzuki K Poulose, Zenghui Yu, Anup Patel, Atish Patra, Guo Ren,
Mayuresh Chitale, Greentime Hu, wchen, Conor Dooley,
Heiko Stuebner, Minda Chen, Samuel Holland, Jisheng Zhang,
Sean Christopherson, Peter Xu, Like Xu, Vipin Sharma,
Maciej Wieczor-Retman, Aaron Lewis, Thomas Huth, linux-kernel,
linux-riscv, kvm, linux-kselftest, linux-arm-kernel, kvmarm,
kvm-riscv
On Thu, Dec 21, 2023 at 10:58:40AM +0800, Haibo Xu wrote:
> On Wed, Dec 20, 2023 at 9:58 PM Marc Zyngier <maz@kernel.org> wrote:
> >
> > On Wed, 20 Dec 2023 13:51:24 +0000,
> > Haibo Xu <xiaobo55x@gmail.com> wrote:
> > >
> > > On Wed, Dec 20, 2023 at 5:00 PM Marc Zyngier <maz@kernel.org> wrote:
> > > >
> > > > On 2023-12-20 06:50, Haibo Xu wrote:
> > > > > On Wed, Dec 20, 2023 at 2:22 AM Marc Zyngier <maz@kernel.org> wrote:
> > > > >>
> > > > >> On Tue, 12 Dec 2023 09:31:20 +0000,
> > > > >> Haibo Xu <haibo1.xu@intel.com> wrote:
> > > > >> > diff --git a/tools/testing/selftests/kvm/include/timer_test.h b/tools/testing/selftests/kvm/include/timer_test.h
> > > > >> > index 968257b893a7..b1d405e7157d 100644
> > > > >> > --- a/tools/testing/selftests/kvm/include/timer_test.h
> > > > >> > +++ b/tools/testing/selftests/kvm/include/timer_test.h
> > > > >> > @@ -22,6 +22,7 @@ struct test_args {
> > > > >> > int nr_iter;
> > > > >> > int timer_period_ms;
> > > > >> > int migration_freq_ms;
> > > > >> > + int timer_err_margin_us;
> > > > >>
> > > > >> ... except that you are storing it as a signed value. Some consistency
> > > > >> wouldn't hurt, really, and would avoid issues when passing large
> > > > >> values.
> > > > >>
> > > > >
> > > > > Yes, it's more proper to use an unsigned int for the non-negative error
> > > > > margin.
> > > > > Storing as signed here is just to keep the type consistent with that
> > > > > of timer_period_ms
> > > > > since there will be '+' operation in other places.
> > > > >
> > > > > tools/testing/selftests/kvm/aarch64/arch_timer.c
> > > > > /* Setup a timeout for the interrupt to arrive */
> > > > > udelay(msecs_to_usecs(test_args.timer_period_ms) +
> > > > > test_args.timer_err_margin_us);
> > > >
> > > > But that's exactly why using a signed quantity is wrong.
> > > > What does it mean to have a huge *negative* margin?
> > > >
> > >
> > > Hi Marc,
> > >
> > > I agree that negative values are meaningless for the margin.
> > > If I understand correctly, the negative margin should be filtered by
> > > assertion in atoi_non_negative().
> >
> > No. Please.
> >
> > atoi_non_negative() returns a uint32_t, which is what it should do.
> > The bug is squarely in the use of an 'int' to store such value, and it
> > is the *storage* that turns a positive value into a negative one.
> >
>
> Thanks for the detailed info!
>
> May I understand that your concern is mainly for a platform with 64bit int type,
> which may trigger the positive to negative convert?
>
> If so, I think we may need to do a clean up for the test code since
> several other
> places have the same issue.
Yes, I think we should do that cleanup. While there are probably several
offenders scattered throughout kvm selftests, we can keep the scope of
this series focused on arch_timer.c. Let's audit all uses of signed types
and convert them to unsigned as necessary with some separate patch(es)
before splitting the test, so both aarch64 and riscv get the cleanups.
Thanks,
drew
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^ permalink raw reply [flat|nested] 28+ messages in thread