[V3 11/11] KVM: selftests: Add simple sev vm testing

Peter Gonda
2022-08-10T15:21:52Z

A very simple of booting SEV guests that checks related CPUID bits. This
is a stripped down version of "[PATCH v2 08/13] KVM: selftests: add SEV
boot tests" from Michael but much simpler.

Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Peter Gonda <pgonda@google.com>
---
tools/testing/selftests/kvm/.gitignore | 1 +
tools/testing/selftests/kvm/Makefile | 1 +
.../selftests/kvm/include/x86_64/sev.h | 3 +
tools/testing/selftests/kvm/lib/x86_64/sev.c | 2 -
.../selftests/kvm/x86_64/sev_all_boot_test.c | 131 ++++++++++++++++++
5 files changed, 136 insertions(+), 2 deletions(-)
create mode 100644 tools/testing/selftests/kvm/x86_64/sev_all_boot_test.c

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index d625a3f83780..ca57969a0923 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -33,6 +33,7 @@
/x86_64/pmu_event_filter_test
/x86_64/set_boot_cpu_id
/x86_64/set_sregs_test
+/x86_64/sev_all_boot_test
/x86_64/sev_migrate_tests
/x86_64/smm_test
/x86_64/state_test
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index b247c4b595af..73b083f93b46 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -122,6 +122,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/tsc_msrs_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_pmu_caps_test
TEST_GEN_PROGS_x86_64 += x86_64/xen_shinfo_test
TEST_GEN_PROGS_x86_64 += x86_64/xen_vmcall_test
+TEST_GEN_PROGS_x86_64 += x86_64/sev_all_boot_test
TEST_GEN_PROGS_x86_64 += x86_64/sev_migrate_tests
TEST_GEN_PROGS_x86_64 += x86_64/amx_test
TEST_GEN_PROGS_x86_64 += x86_64/max_vcpuid_cap_test
diff --git a/tools/testing/selftests/kvm/include/x86_64/sev.h b/tools/testing/selftests/kvm/include/x86_64/sev.h
index 2f7f7c741b12..b6552ea1c716 100644
--- a/tools/testing/selftests/kvm/include/x86_64/sev.h
+++ b/tools/testing/selftests/kvm/include/x86_64/sev.h
@@ -22,6 +22,9 @@
#define SEV_POLICY_NO_DBG (1UL << 0)
#define SEV_POLICY_ES (1UL << 2)

+#define CPUID_MEM_ENC_LEAF 0x8000001f
+#define CPUID_EBX_CBIT_MASK 0x3f
+
enum {
SEV_GSTATE_UNINIT = 0,
SEV_GSTATE_LUPDATE,
diff --git a/tools/testing/selftests/kvm/lib/x86_64/sev.c b/tools/testing/selftests/kvm/lib/x86_64/sev.c
index 3abcf50c0b5d..8f9f55c685a7 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/sev.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/sev.c
@@ -13,8 +13,6 @@
#include "sev.h"

#define PAGE_SHIFT 12
-#define CPUID_MEM_ENC_LEAF 0x8000001f
-#define CPUID_EBX_CBIT_MASK 0x3f

struct sev_vm {
struct kvm_vm *vm;
diff --git a/tools/testing/selftests/kvm/x86_64/sev_all_boot_test.c b/tools/testing/selftests/kvm/x86_64/sev_all_boot_test.c
new file mode 100644
index 000000000000..b319d18bdb60
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/sev_all_boot_test.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Basic SEV boot tests.
+ *
+ * Copyright (C) 2021 Advanced Micro Devices
+ */
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include "test_util.h"
+
+#include "kvm_util.h"
+#include "processor.h"
+#include "svm_util.h"
+#include "linux/psp-sev.h"
+#include "sev.h"
+
+#define VCPU_ID 2
+#define PAGE_STRIDE 32
+
+#define SHARED_PAGES 8192
+#define SHARED_VADDR_MIN 0x1000000
+
+#define PRIVATE_PAGES 2048
+#define PRIVATE_VADDR_MIN (SHARED_VADDR_MIN + SHARED_PAGES * PAGE_SIZE)
+
+#define TOTAL_PAGES (512 + SHARED_PAGES + PRIVATE_PAGES)
+
+#define NR_SYNCS 1
+
+static void guest_run_loop(struct kvm_vcpu *vcpu)
+{
+ struct ucall uc;
+ int i;
+
+ for (i = 0; i <= NR_SYNCS; ++i) {
+ vcpu_run(vcpu);
+ switch (get_ucall(vcpu, &uc)) {
+ case UCALL_SYNC:
+ continue;
+ case UCALL_DONE:
+ return;
+ case UCALL_ABORT:
+ TEST_ASSERT(false, "%s at %s:%ld\n\tvalues: %#lx, %#lx",
+ (const char *)uc.args[0], __FILE__,
+ uc.args[1], uc.args[2], uc.args[3]);
+ default:
+ TEST_ASSERT(
+ false, "Unexpected exit: %s",
+ exit_reason_str(vcpu->run->exit_reason));
+ }
+ }
+}
+
+static void __attribute__((__flatten__)) guest_sev_code(void)
+{
+ uint32_t eax, ebx, ecx, edx;
+ uint64_t sev_status;
+
+ GUEST_SYNC(1);
+
+ cpuid(CPUID_MEM_ENC_LEAF, &eax, &ebx, &ecx, &edx);
+ GUEST_ASSERT(eax & (1 << 1));
+
+ sev_status = rdmsr(MSR_AMD64_SEV);
+ GUEST_ASSERT((sev_status & 0x1) == 1);
+
+ GUEST_DONE();
+}
+
+static struct sev_vm *setup_test_common(void *guest_code, uint64_t policy,
+ struct kvm_vcpu **vcpu)
+{
+ uint8_t measurement[512];
+ struct sev_vm *sev;
+ struct kvm_vm *vm;
+ int i;
+
+ sev = sev_vm_create(policy, TOTAL_PAGES);
+ if (!sev)
+ return NULL;
+ vm = sev_get_vm(sev);
+
+ /* Set up VCPU and initial guest kernel. */
+ *vcpu = vm_vcpu_add(vm, VCPU_ID, guest_code);
+ kvm_vm_elf_load(vm, program_invocation_name);
+
+ /* Allocations/setup done. Encrypt initial guest payload. */
+ sev_vm_launch(sev);
+
+ /* Dump the initial measurement. A test to actually verify it would be nice. */
+ sev_vm_launch_measure(sev, measurement);
+ pr_info("guest measurement: ");
+ for (i = 0; i < 32; ++i)
+ pr_info("%02x", measurement[i]);
+ pr_info("\n");
+
+ sev_vm_launch_finish(sev);
+
+ return sev;
+}
+
+static void test_sev(void *guest_code, uint64_t policy)
+{
+ struct sev_vm *sev;
+ struct kvm_vcpu *vcpu;
+
+ sev = setup_test_common(guest_code, policy, &vcpu);
+ if (!sev)
+ return;
+
+ /* Guest is ready to run. Do the tests. */
+ guest_run_loop(vcpu);
+
+ pr_info("guest ran successfully\n");
+
+ sev_vm_free(sev);
+}
+
+int main(int argc, char *argv[])
+{
+ /* SEV tests */
+ test_sev(guest_sev_code, SEV_POLICY_NO_DBG);
+ test_sev(guest_sev_code, 0);
+
+ return 0;
+}
--
2.37.1.559.g78731f0fdb-goog