[PATCH v5 07/13] KVM: selftests: Add pmu.h and lib/pmu.c for common PMU assets

Sean Christopherson
2023-10-24T00:27:19Z

From: Jinrong Liang <cloudliang@tencent.com>

By defining the PMU performance events and masks relevant for x86 in
the new pmu.h and pmu.c, it becomes easier to reference them, minimizing
potential errors in code that handles these values.

Clean up pmu_event_filter_test.c by including pmu.h and removing
unnecessary macros.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Jinrong Liang <cloudliang@tencent.com>
[sean: drop PSEUDO_ARCH_REFERENCE_CYCLES]
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
tools/testing/selftests/kvm/Makefile | 1 +
tools/testing/selftests/kvm/include/pmu.h | 84 +++++++++++++++++++
tools/testing/selftests/kvm/lib/pmu.c | 28 +++++++
.../kvm/x86_64/pmu_event_filter_test.c | 32 ++-----
4 files changed, 122 insertions(+), 23 deletions(-)
create mode 100644 tools/testing/selftests/kvm/include/pmu.h
create mode 100644 tools/testing/selftests/kvm/lib/pmu.c

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index fb01c3f8d3da..ed1c17cabc07 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -23,6 +23,7 @@ LIBKVM += lib/guest_modes.c
LIBKVM += lib/io.c
LIBKVM += lib/kvm_util.c
LIBKVM += lib/memstress.c
+LIBKVM += lib/pmu.c
LIBKVM += lib/guest_sprintf.c
LIBKVM += lib/rbtree.c
LIBKVM += lib/sparsebit.c
diff --git a/tools/testing/selftests/kvm/include/pmu.h b/tools/testing/selftests/kvm/include/pmu.h
new file mode 100644
index 000000000000..987602c62b51
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/pmu.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2023, Tencent, Inc.
+ */
+#ifndef SELFTEST_KVM_PMU_H
+#define SELFTEST_KVM_PMU_H
+
+#include <stdint.h>
+
+#define X86_PMC_IDX_MAX 64
+#define INTEL_PMC_MAX_GENERIC 32
+#define KVM_PMU_EVENT_FILTER_MAX_EVENTS 300
+
+#define GP_COUNTER_NR_OFS_BIT 8
+#define EVENT_LENGTH_OFS_BIT 24
+
+#define PMU_VERSION_MASK GENMASK_ULL(7, 0)
+#define EVENT_LENGTH_MASK GENMASK_ULL(31, EVENT_LENGTH_OFS_BIT)
+#define GP_COUNTER_NR_MASK GENMASK_ULL(15, GP_COUNTER_NR_OFS_BIT)
+#define FIXED_COUNTER_NR_MASK GENMASK_ULL(4, 0)
+
+#define ARCH_PERFMON_EVENTSEL_EVENT GENMASK_ULL(7, 0)
+#define ARCH_PERFMON_EVENTSEL_UMASK GENMASK_ULL(15, 8)
+#define ARCH_PERFMON_EVENTSEL_USR BIT_ULL(16)
+#define ARCH_PERFMON_EVENTSEL_OS BIT_ULL(17)
+#define ARCH_PERFMON_EVENTSEL_EDGE BIT_ULL(18)
+#define ARCH_PERFMON_EVENTSEL_PIN_CONTROL BIT_ULL(19)
+#define ARCH_PERFMON_EVENTSEL_INT BIT_ULL(20)
+#define ARCH_PERFMON_EVENTSEL_ANY BIT_ULL(21)
+#define ARCH_PERFMON_EVENTSEL_ENABLE BIT_ULL(22)
+#define ARCH_PERFMON_EVENTSEL_INV BIT_ULL(23)
+#define ARCH_PERFMON_EVENTSEL_CMASK GENMASK_ULL(31, 24)
+
+#define PMC_MAX_FIXED 16
+#define PMC_IDX_FIXED 32
+
+/* RDPMC offset for Fixed PMCs */
+#define PMC_FIXED_RDPMC_BASE BIT_ULL(30)
+#define PMC_FIXED_RDPMC_METRICS BIT_ULL(29)
+
+#define FIXED_BITS_MASK 0xFULL
+#define FIXED_BITS_STRIDE 4
+#define FIXED_0_KERNEL BIT_ULL(0)
+#define FIXED_0_USER BIT_ULL(1)
+#define FIXED_0_ANYTHREAD BIT_ULL(2)
+#define FIXED_0_ENABLE_PMI BIT_ULL(3)
+
+#define fixed_bits_by_idx(_idx, _bits) \
+ ((_bits) << ((_idx) * FIXED_BITS_STRIDE))
+
+#define AMD64_NR_COUNTERS 4
+#define AMD64_NR_COUNTERS_CORE 6
+
+#define PMU_CAP_FW_WRITES BIT_ULL(13)
+#define PMU_CAP_LBR_FMT 0x3f
+
+enum intel_pmu_architectural_events {
+ /*
+ * The order of the architectural events matters as support for each
+ * event is enumerated via CPUID using the index of the event.
+ */
+ INTEL_ARCH_CPU_CYCLES,
+ INTEL_ARCH_INSTRUCTIONS_RETIRED,
+ INTEL_ARCH_REFERENCE_CYCLES,
+ INTEL_ARCH_LLC_REFERENCES,
+ INTEL_ARCH_LLC_MISSES,
+ INTEL_ARCH_BRANCHES_RETIRED,
+ INTEL_ARCH_BRANCHES_MISPREDICTED,
+ NR_INTEL_ARCH_EVENTS,
+};
+
+enum amd_pmu_k7_events {
+ AMD_ZEN_CORE_CYCLES,
+ AMD_ZEN_INSTRUCTIONS,
+ AMD_ZEN_BRANCHES,
+ AMD_ZEN_BRANCH_MISSES,
+ NR_AMD_ARCH_EVENTS,
+};
+
+extern const uint64_t intel_pmu_arch_events[];
+extern const uint64_t amd_pmu_arch_events[];
+extern const int intel_pmu_fixed_pmc_events[];
+
+#endif /* SELFTEST_KVM_PMU_H */
diff --git a/tools/testing/selftests/kvm/lib/pmu.c b/tools/testing/selftests/kvm/lib/pmu.c
new file mode 100644
index 000000000000..27a6c35f98a1
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/pmu.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023, Tencent, Inc.
+ */
+
+#include <stdint.h>
+
+#include "pmu.h"
+
+/* Definitions for Architectural Performance Events */
+#define ARCH_EVENT(select, umask) (((select) & 0xff) | ((umask) & 0xff) << 8)
+
+const uint64_t intel_pmu_arch_events[] = {
+ [INTEL_ARCH_CPU_CYCLES] = ARCH_EVENT(0x3c, 0x0),
+ [INTEL_ARCH_INSTRUCTIONS_RETIRED] = ARCH_EVENT(0xc0, 0x0),
+ [INTEL_ARCH_REFERENCE_CYCLES] = ARCH_EVENT(0x3c, 0x1),
+ [INTEL_ARCH_LLC_REFERENCES] = ARCH_EVENT(0x2e, 0x4f),
+ [INTEL_ARCH_LLC_MISSES] = ARCH_EVENT(0x2e, 0x41),
+ [INTEL_ARCH_BRANCHES_RETIRED] = ARCH_EVENT(0xc4, 0x0),
+ [INTEL_ARCH_BRANCHES_MISPREDICTED] = ARCH_EVENT(0xc5, 0x0),
+};
+
+const uint64_t amd_pmu_arch_events[] = {
+ [AMD_ZEN_CORE_CYCLES] = ARCH_EVENT(0x76, 0x00),
+ [AMD_ZEN_INSTRUCTIONS] = ARCH_EVENT(0xc0, 0x00),
+ [AMD_ZEN_BRANCHES] = ARCH_EVENT(0xc2, 0x00),
+ [AMD_ZEN_BRANCH_MISSES] = ARCH_EVENT(0xc3, 0x00),
+};
diff --git a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
index 283cc55597a4..b6e4f57a8651 100644
--- a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
+++ b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
@@ -11,31 +11,18 @@
*/

#define _GNU_SOURCE /* for program_invocation_short_name */
-#include "test_util.h"
+
#include "kvm_util.h"
+#include "pmu.h"
#include "processor.h"
-
-/*
- * In lieu of copying perf_event.h into tools...
- */
-#define ARCH_PERFMON_EVENTSEL_OS (1ULL << 17)
-#define ARCH_PERFMON_EVENTSEL_ENABLE (1ULL << 22)
-
-/* End of stuff taken from perf_event.h. */
-
-/* Oddly, this isn't in perf_event.h. */
-#define ARCH_PERFMON_BRANCHES_RETIRED 5
+#include "test_util.h"

#define NUM_BRANCHES 42
-#define INTEL_PMC_IDX_FIXED 32
-
-/* Matches KVM_PMU_EVENT_FILTER_MAX_EVENTS in pmu.c */
-#define MAX_FILTER_EVENTS 300
#define MAX_TEST_EVENTS 10

#define PMU_EVENT_FILTER_INVALID_ACTION (KVM_PMU_EVENT_DENY + 1)
#define PMU_EVENT_FILTER_INVALID_FLAGS (KVM_PMU_EVENT_FLAGS_VALID_MASK << 1)
-#define PMU_EVENT_FILTER_INVALID_NEVENTS (MAX_FILTER_EVENTS + 1)
+#define PMU_EVENT_FILTER_INVALID_NEVENTS (KVM_PMU_EVENT_FILTER_MAX_EVENTS + 1)

/*
* This is how the event selector and unit mask are stored in an AMD
@@ -63,7 +50,6 @@

#define AMD_ZEN_BR_RETIRED EVENT(0xc2, 0)

-
/*
* "Retired instructions", from Processor Programming Reference
* (PPR) for AMD Family 17h Model 01h, Revision B1 Processors,
@@ -84,7 +70,7 @@ struct __kvm_pmu_event_filter {
__u32 fixed_counter_bitmap;
__u32 flags;
__u32 pad[4];
- __u64 events[MAX_FILTER_EVENTS];
+ __u64 events[KVM_PMU_EVENT_FILTER_MAX_EVENTS];
};

/*
@@ -729,14 +715,14 @@ static void add_dummy_events(uint64_t *events, int nevents)

static void test_masked_events(struct kvm_vcpu *vcpu)
{
- int nevents = MAX_FILTER_EVENTS - MAX_TEST_EVENTS;
- uint64_t events[MAX_FILTER_EVENTS];
+ int nevents = KVM_PMU_EVENT_FILTER_MAX_EVENTS - MAX_TEST_EVENTS;
+ uint64_t events[KVM_PMU_EVENT_FILTER_MAX_EVENTS];

/* Run the test cases against a sparse PMU event filter. */
run_masked_events_tests(vcpu, events, 0);

/* Run the test cases against a dense PMU event filter. */
- add_dummy_events(events, MAX_FILTER_EVENTS);
+ add_dummy_events(events, KVM_PMU_EVENT_FILTER_MAX_EVENTS);
run_masked_events_tests(vcpu, events, nevents);
}

@@ -818,7 +804,7 @@ static void intel_run_fixed_counter_guest_code(uint8_t fixed_ctr_idx)
/* Only OS_EN bit is enabled for fixed counter[idx]. */
wrmsr(MSR_CORE_PERF_FIXED_CTR_CTRL, BIT_ULL(4 * fixed_ctr_idx));
wrmsr(MSR_CORE_PERF_GLOBAL_CTRL,
- BIT_ULL(INTEL_PMC_IDX_FIXED + fixed_ctr_idx));
+ BIT_ULL(PMC_IDX_FIXED + fixed_ctr_idx));
__asm__ __volatile__("loop ." : "+c"((int){NUM_BRANCHES}));
wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, 0);

--
2.42.0.758.gaed0368e0e-goog