Commit 410cb01e authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Sean Christopherson
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KVM: selftests: Use generic sys_clocksource_is_tsc() in vmx_nested_tsc_scaling_test 



Despite its name, system_has_stable_tsc() just checks that system
clocksource is 'tsc'; this can now be done with generic
sys_clocksource_is_tsc().

No functional change intended.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20240109141121.1619463-3-vkuznets@redhat.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent e440c5f2

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

+1 −18
Original line number Diff line number Diff line
@@ -116,23 +116,6 @@ static void l1_guest_code(struct vmx_pages *vmx_pages) 
	GUEST_DONE();

}



static bool system_has_stable_tsc(void)

{

	bool tsc_is_stable;

	FILE *fp;

	char buf[4];



	fp = fopen("/sys/devices/system/clocksource/clocksource0/current_clocksource", "r");

	if (fp == NULL)

		return false;



	tsc_is_stable = fgets(buf, sizeof(buf), fp) &&

			!strncmp(buf, "tsc", sizeof(buf));



	fclose(fp);

	return tsc_is_stable;

}



int main(int argc, char *argv[])

{

	struct kvm_vcpu *vcpu;
@@ -148,7 +131,7 @@ int main(int argc, char *argv[]) 


	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));

	TEST_REQUIRE(kvm_has_cap(KVM_CAP_TSC_CONTROL));

	TEST_REQUIRE(system_has_stable_tsc());

	TEST_REQUIRE(sys_clocksource_is_tsc());



	/*

	 * We set L1's scale factor to be a random number from 2 to 10.