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KVM: selftests: update hyperv_cpuid with SynDBG tests

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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 <vkuznets@redhat.com>
Signed-off-by: Jon Doron <arilou@gmail.com>
Message-Id: <20200529134543.1127440-7-arilou@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2020-05-29 16:45:43 +03:00 committed by Paolo Bonzini
parent b187038b5e
commit fb0cb6a821
1 changed files with 55 additions and 46 deletions
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101
tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c
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@ -26,18 +26,18 @@ static void guest_code(void)
{ {
} }
static int smt_possible(void) static bool smt_possible(void)
{ {
char buf[16]; char buf[16];
FILE *f; FILE *f;
bool res = 1; bool res = true;
f = fopen("/sys/devices/system/cpu/smt/control", "r"); f = fopen("/sys/devices/system/cpu/smt/control", "r");
if (f) { if (f) {
if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) { if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) {
if (!strncmp(buf, "forceoff", 8) || if (!strncmp(buf, "forceoff", 8) ||
!strncmp(buf, "notsupported", 12)) !strncmp(buf, "notsupported", 12))
res = 0; res = false;
} }
fclose(f); fclose(f);
} }
@ -46,29 +46,31 @@ static int smt_possible(void)
} }
static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries, static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries,
int evmcs_enabled) bool evmcs_enabled)
{ {
int i; int i;
int nent = 9;
u32 test_val;
if (!evmcs_enabled) if (evmcs_enabled)
TEST_ASSERT(hv_cpuid_entries->nent == 6, nent += 1; /* 0x4000000A */
"KVM_GET_SUPPORTED_HV_CPUID should return 6 entries"
" when Enlightened VMCS is disabled (returned %d)", TEST_ASSERT(hv_cpuid_entries->nent == nent,
hv_cpuid_entries->nent); "KVM_GET_SUPPORTED_HV_CPUID should return %d entries"
else " with evmcs=%d (returned %d)",
TEST_ASSERT(hv_cpuid_entries->nent == 7, nent, evmcs_enabled, hv_cpuid_entries->nent);
"KVM_GET_SUPPORTED_HV_CPUID should return 7 entries"
" when Enlightened VMCS is enabled (returned %d)",
hv_cpuid_entries->nent);
for (i = 0; i < hv_cpuid_entries->nent; i++) { for (i = 0; i < hv_cpuid_entries->nent; i++) {
struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i];
TEST_ASSERT((entry->function >= 0x40000000) && TEST_ASSERT((entry->function >= 0x40000000) &&
(entry->function <= 0x4000000A), (entry->function <= 0x40000082),
"function %x is our of supported range", "function %x is our of supported range",
entry->function); entry->function);
TEST_ASSERT(evmcs_enabled || (entry->function != 0x4000000A),
"0x4000000A leaf should not be reported");
TEST_ASSERT(entry->index == 0, TEST_ASSERT(entry->index == 0,
".index field should be zero"); ".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] && TEST_ASSERT(!entry->padding[0] && !entry->padding[1] &&
!entry->padding[2], "padding should be zero"); !entry->padding[2], "padding should be zero");
if (entry->function == 0x40000004) { switch (entry->function) {
int nononarchcs = !!(entry->eax & (1UL << 18)); 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" "NoNonArchitecturalCoreSharing bit"
" doesn't reflect SMT setting"); " 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[]) int main(int argc, char *argv[])
{ {
struct kvm_vm *vm; struct kvm_vm *vm;
int rv; int rv, stage;
struct kvm_cpuid2 *hv_cpuid_entries; struct kvm_cpuid2 *hv_cpuid_entries;
bool evmcs_enabled;
/* Tell stdout not to buffer its content */ /* Tell stdout not to buffer its content */
setbuf(stdout, NULL); setbuf(stdout, NULL);
@ -145,36 +159,31 @@ int main(int argc, char *argv[])
exit(KSFT_SKIP); exit(KSFT_SKIP);
} }
/* Create VM */ for (stage = 0; stage < 3; stage++) {
vm = vm_create_default(VCPU_ID, 0, guest_code); 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); hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm);
if (!hv_cpuid_entries) test_hv_cpuid(hv_cpuid_entries, evmcs_enabled);
return 1; free(hv_cpuid_entries);
kvm_vm_free(vm);
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;
} }
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; return 0;
} }