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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>
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@ -26,6 +26,25 @@ static void guest_code(void)
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{
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}
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static int smt_possible(void)
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{
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char buf[16];
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FILE *f;
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bool res = 1;
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f = fopen("/sys/devices/system/cpu/smt/control", "r");
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if (f) {
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if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) {
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if (!strncmp(buf, "forceoff", 8) ||
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!strncmp(buf, "notsupported", 12))
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res = 0;
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}
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fclose(f);
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}
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return res;
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}
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static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries,
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int evmcs_enabled)
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{
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@ -59,6 +78,14 @@ static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries,
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TEST_ASSERT(!entry->padding[0] && !entry->padding[1] &&
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!entry->padding[2], "padding should be zero");
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if (entry->function == 0x40000004) {
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int nononarchcs = !!(entry->eax & (1UL << 18));
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TEST_ASSERT(nononarchcs == !smt_possible(),
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"NoNonArchitecturalCoreSharing bit"
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" doesn't reflect SMT setting");
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}
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/*
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* If needed for debug:
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* fprintf(stdout,
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