Messages in this thread Patch in this message | | | Date | Wed, 5 Apr 2023 17:17:24 -0700 | Subject | [PATCH] KVM: selftests: Refactor stable TSC check to use TEST_REQUIRE() | From | Sean Christopherson <> |
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Refactor the nested TSC scaling test's check on a stable system TSC to use TEST_REQUIRE() to do the heavy lifting when the system doesn't have a stable TSC. Using a helper+TEST_REQUIRE() eliminates the need for gotos and a custom message.
Cc: Hao Ge <gehao@kylinos.cn> Cc: Vipin Sharma <vipinsh@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com> --- .../kvm/x86_64/vmx_nested_tsc_scaling_test.c | 22 ++++++------------- 1 file changed, 7 insertions(+), 15 deletions(-)
diff --git a/tools/testing/selftests/kvm/x86_64/vmx_nested_tsc_scaling_test.c b/tools/testing/selftests/kvm/x86_64/vmx_nested_tsc_scaling_test.c index fa03c8d1ce4e..e710b6e7fb38 100644 --- a/tools/testing/selftests/kvm/x86_64/vmx_nested_tsc_scaling_test.c +++ b/tools/testing/selftests/kvm/x86_64/vmx_nested_tsc_scaling_test.c @@ -116,29 +116,21 @@ static void l1_guest_code(struct vmx_pages *vmx_pages) GUEST_DONE(); } -static void stable_tsc_check_supported(void) +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) - goto skip_test; + return false; - if (fgets(buf, sizeof(buf), fp) == NULL) - goto close_fp; + tsc_is_stable = fgets(buf, sizeof(buf), fp) && + !strncmp(buf, "tsc", sizeof(buf)); - if (strncmp(buf, "tsc", sizeof(buf))) - goto close_fp; - - fclose(fp); - return; - -close_fp: fclose(fp); -skip_test: - print_skip("Kernel does not use TSC clocksource - assuming that host TSC is not stable"); - exit(KSFT_SKIP); + return tsc_is_stable; } int main(int argc, char *argv[]) @@ -156,7 +148,7 @@ int main(int argc, char *argv[]) TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX)); TEST_REQUIRE(kvm_has_cap(KVM_CAP_TSC_CONTROL)); - stable_tsc_check_supported(); + TEST_REQUIRE(system_has_stable_tsc()); /* * We set L1's scale factor to be a random number from 2 to 10. base-commit: 7712145073876092e9aa81f0b836fef8b5694b14 -- 2.40.0.348.gf938b09366-goog
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