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authorVitaly Kuznetsov <vkuznets@redhat.com>2019-09-16 18:22:58 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2019-09-24 13:37:31 +0200
commite738772e29214019f506372dd1162723b7a4d507 (patch)
treec6f4c9053d1b947985530f9779f49e7e2308dad1 /tools/testing
parentb2d8b167e15bb5ec2691d1119c025630a247f649 (diff)
downloadlinux-e738772e29214019f506372dd1162723b7a4d507.tar.bz2
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>
Diffstat (limited to 'tools/testing')
-rw-r--r--tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c b/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c
index ee59831fbc98..443a2b54645b 100644
--- a/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c
@@ -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,