KVM: selftests: Run clocksource dependent tests with hyperv_clocksource_tsc_page too

KVM's 'gtod_is_based_on_tsc()' recognizes two clocksources: 'tsc' and
'hyperv_clocksource_tsc_page' and enables kvmclock in 'masterclock'
mode when either is in use. Transform 'sys_clocksource_is_tsc()' into
'sys_clocksource_is_based_on_tsc()' to support the later. This affects
two tests: kvm_clock_test and vmx_nested_tsc_scaling_test, both seem
to work well when system clocksource is 'hyperv_clocksource_tsc_page'.

Signed-off-by: Vitaly Kuznetsov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

Author: vittyvk

tools/testing/selftests/kvm/include/x86_64/processor.h

@@ -1271,6 +1271,6 @@ void virt_map_level(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
 #define PFERR_GUEST_PAGE_MASK	BIT_ULL(PFERR_GUEST_PAGE_BIT)
 #define PFERR_IMPLICIT_ACCESS	BIT_ULL(PFERR_IMPLICIT_ACCESS_BIT)
 
-bool sys_clocksource_is_tsc(void);
+bool sys_clocksource_is_based_on_tsc(void);
 
 #endif /* SELFTEST_KVM_PROCESSOR_H */

tools/testing/selftests/kvm/lib/x86_64/processor.c

@@ -1300,10 +1300,11 @@ void kvm_selftest_arch_init(void)
 	host_cpu_is_amd = this_cpu_is_amd();
 }
 
-bool sys_clocksource_is_tsc(void)
+bool sys_clocksource_is_based_on_tsc(void)
 {
 	char *clk_name = sys_get_cur_clocksource();
-	bool ret = !strcmp(clk_name, "tsc\n");
+	bool ret = !strcmp(clk_name, "tsc\n") ||
+		   !strcmp(clk_name, "hyperv_clocksource_tsc_page\n");
 
 	free(clk_name);
 

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

@@ -143,7 +143,7 @@ int main(void)
 	flags = kvm_check_cap(KVM_CAP_ADJUST_CLOCK);
 	TEST_REQUIRE(flags & KVM_CLOCK_REALTIME);
 
-	TEST_REQUIRE(sys_clocksource_is_tsc());
+	TEST_REQUIRE(sys_clocksource_is_based_on_tsc());
 
 	vm = vm_create_with_one_vcpu(&vcpu, guest_main);
 

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

@@ -131,7 +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(sys_clocksource_is_tsc());
+	TEST_REQUIRE(sys_clocksource_is_based_on_tsc());
 
 	/*
 	 * We set L1's scale factor to be a random number from 2 to 10.