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KVM: selftests: hyperv_cpuid: add check for NoNonArchitecturalCoreSharing bit 

The bit is supposed to be '1' when SMT is not supported or forcefully
disabled and '0' otherwise.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2019-09-16 18:22:58 +02:00 committed by Paolo Bonzini
parent b2d8b167e1
commit e738772e29
1 changed files with 27 additions and 0 deletions
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27
tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c
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@ -26,6 +26,25 @@ static void guest_code(void)
{
}
static int smt_possible(void)
{
char buf[16];
FILE *f;
bool res = 1;
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;
}
fclose(f);
}
return res;
}
static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries,
int evmcs_enabled)
{
@ -59,6 +78,14 @@ 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));
TEST_ASSERT(nononarchcs == !smt_possible(),
"NoNonArchitecturalCoreSharing bit"
" doesn't reflect SMT setting");
}
/*
* If needed for debug:
* fprintf(stdout,