From fb0cb6a8211cfe00178614ae72a0b426bd1ff016 Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Fri, 29 May 2020 16:45:43 +0300 Subject: [PATCH] KVM: selftests: update hyperv_cpuid with SynDBG tests Update tests to reflect new CPUID capabilities with SYNDBG. Check that we get the right number of entries and that 0x40000000.EAX always returns the correct max leaf. Signed-off-by: Vitaly Kuznetsov Signed-off-by: Jon Doron Message-Id: <20200529134543.1127440-7-arilou@gmail.com> Signed-off-by: Paolo Bonzini --- .../selftests/kvm/x86_64/hyperv_cpuid.c | 101 ++++++++++-------- 1 file changed, 55 insertions(+), 46 deletions(-) diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c b/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c index 83323f3d7ca0..4a7967cca281 100644 --- a/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c +++ b/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c @@ -26,18 +26,18 @@ static void guest_code(void) { } -static int smt_possible(void) +static bool smt_possible(void) { char buf[16]; FILE *f; - bool res = 1; + bool res = true; f = fopen("/sys/devices/system/cpu/smt/control", "r"); if (f) { if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) { if (!strncmp(buf, "forceoff", 8) || !strncmp(buf, "notsupported", 12)) - res = 0; + res = false; } fclose(f); } @@ -46,29 +46,31 @@ static int smt_possible(void) } static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries, - int evmcs_enabled) + bool evmcs_enabled) { int i; + int nent = 9; + u32 test_val; - if (!evmcs_enabled) - TEST_ASSERT(hv_cpuid_entries->nent == 6, - "KVM_GET_SUPPORTED_HV_CPUID should return 6 entries" - " when Enlightened VMCS is disabled (returned %d)", - hv_cpuid_entries->nent); - else - TEST_ASSERT(hv_cpuid_entries->nent == 7, - "KVM_GET_SUPPORTED_HV_CPUID should return 7 entries" - " when Enlightened VMCS is enabled (returned %d)", - hv_cpuid_entries->nent); + if (evmcs_enabled) + nent += 1; /* 0x4000000A */ + + TEST_ASSERT(hv_cpuid_entries->nent == nent, + "KVM_GET_SUPPORTED_HV_CPUID should return %d entries" + " with evmcs=%d (returned %d)", + nent, evmcs_enabled, hv_cpuid_entries->nent); for (i = 0; i < hv_cpuid_entries->nent; i++) { struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; TEST_ASSERT((entry->function >= 0x40000000) && - (entry->function <= 0x4000000A), + (entry->function <= 0x40000082), "function %x is our of supported range", entry->function); + TEST_ASSERT(evmcs_enabled || (entry->function != 0x4000000A), + "0x4000000A leaf should not be reported"); + TEST_ASSERT(entry->index == 0, ".index field should be zero"); @@ -78,12 +80,23 @@ static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries, TEST_ASSERT(!entry->padding[0] && !entry->padding[1] && !entry->padding[2], "padding should be zero"); - if (entry->function == 0x40000004) { - int nononarchcs = !!(entry->eax & (1UL << 18)); + switch (entry->function) { + case 0x40000000: + test_val = 0x40000082; - TEST_ASSERT(nononarchcs == !smt_possible(), + TEST_ASSERT(entry->eax == test_val, + "Wrong max leaf report in 0x40000000.EAX: %x" + " (evmcs=%d)", + entry->eax, evmcs_enabled + ); + break; + case 0x40000004: + test_val = entry->eax & (1UL << 18); + + TEST_ASSERT(!!test_val == !smt_possible(), "NoNonArchitecturalCoreSharing bit" " doesn't reflect SMT setting"); + break; } /* @@ -133,8 +146,9 @@ struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(struct kvm_vm *vm) int main(int argc, char *argv[]) { struct kvm_vm *vm; - int rv; + int rv, stage; struct kvm_cpuid2 *hv_cpuid_entries; + bool evmcs_enabled; /* Tell stdout not to buffer its content */ setbuf(stdout, NULL); @@ -145,36 +159,31 @@ int main(int argc, char *argv[]) exit(KSFT_SKIP); } - /* Create VM */ - vm = vm_create_default(VCPU_ID, 0, guest_code); + for (stage = 0; stage < 3; stage++) { + evmcs_enabled = false; - test_hv_cpuid_e2big(vm); + vm = vm_create_default(VCPU_ID, 0, guest_code); + switch (stage) { + case 0: + test_hv_cpuid_e2big(vm); + continue; + case 1: + break; + case 2: + if (!kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) { + print_skip("Enlightened VMCS is unsupported"); + continue; + } + vcpu_enable_evmcs(vm, VCPU_ID); + evmcs_enabled = true; + break; + } - hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); - if (!hv_cpuid_entries) - return 1; - - test_hv_cpuid(hv_cpuid_entries, 0); - - free(hv_cpuid_entries); - - if (!kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) { - print_skip("Enlightened VMCS is unsupported"); - goto vm_free; + hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); + test_hv_cpuid(hv_cpuid_entries, evmcs_enabled); + free(hv_cpuid_entries); + kvm_vm_free(vm); } - vcpu_enable_evmcs(vm, VCPU_ID); - - hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); - if (!hv_cpuid_entries) - return 1; - - test_hv_cpuid(hv_cpuid_entries, 1); - - free(hv_cpuid_entries); - -vm_free: - kvm_vm_free(vm); - return 0; }