Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e738772e authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
Browse files

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: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent b2d8b167

tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c

+27 −0
Original line number Diff line number Diff line
@@ -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,