diff options
| -rw-r--r-- | tools/testing/selftests/kvm/access_tracking_perf_test.c | 17 | ||||
| -rw-r--r-- | tools/testing/selftests/kvm/include/x86_64/processor.h | 1 |
2 files changed, 13 insertions, 5 deletions
diff --git a/tools/testing/selftests/kvm/access_tracking_perf_test.c b/tools/testing/selftests/kvm/access_tracking_perf_test.c index d45ef319a68f..9f9503e40ca5 100644 --- a/tools/testing/selftests/kvm/access_tracking_perf_test.c +++ b/tools/testing/selftests/kvm/access_tracking_perf_test.c @@ -46,6 +46,7 @@ #include "test_util.h" #include "memstress.h" #include "guest_modes.h" +#include "processor.h" /* Global variable used to synchronize all of the vCPU threads. */ static int iteration; @@ -180,15 +181,21 @@ static void mark_vcpu_memory_idle(struct kvm_vm *vm, * access tracking but low enough as to not make the test too brittle * over time and across architectures. * - * Note that when run in nested virtualization, this check will trigger - * much more frequently because TLB size is unlimited and since no flush - * happens, much more pages are cached there and guest won't see the - * "idle" bit cleared. + * When running the guest as a nested VM, "warn" instead of asserting + * as the TLB size is effectively unlimited and the KVM doesn't + * explicitly flush the TLB when aging SPTEs. As a result, more pages + * are cached and the guest won't see the "idle" bit cleared. */ - if (still_idle >= pages / 10) + if (still_idle >= pages / 10) { +#ifdef __x86_64__ + TEST_ASSERT(this_cpu_has(X86_FEATURE_HYPERVISOR), + "vCPU%d: Too many pages still idle (%lu out of %lu)", + vcpu_idx, still_idle, pages); +#endif printf("WARNING: vCPU%d: Too many pages still idle (%lu out of %lu), " "this will affect performance results.\n", vcpu_idx, still_idle, pages); + } close(page_idle_fd); close(pagemap_fd); diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h index 5d310abe6c3f..22852bd32d7b 100644 --- a/tools/testing/selftests/kvm/include/x86_64/processor.h +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h @@ -94,6 +94,7 @@ struct kvm_x86_cpu_feature { #define X86_FEATURE_XSAVE KVM_X86_CPU_FEATURE(0x1, 0, ECX, 26) #define X86_FEATURE_OSXSAVE KVM_X86_CPU_FEATURE(0x1, 0, ECX, 27) #define X86_FEATURE_RDRAND KVM_X86_CPU_FEATURE(0x1, 0, ECX, 30) +#define X86_FEATURE_HYPERVISOR KVM_X86_CPU_FEATURE(0x1, 0, ECX, 31) #define X86_FEATURE_PAE KVM_X86_CPU_FEATURE(0x1, 0, EDX, 6) #define X86_FEATURE_MCE KVM_X86_CPU_FEATURE(0x1, 0, EDX, 7) #define X86_FEATURE_APIC KVM_X86_CPU_FEATURE(0x1, 0, EDX, 9) |