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I.e. don't > fail the test if Idle HLT does what it's supposed to do. > > Note, unfortunately there's no way to determine if *KVM* supports Idle HLT, > as this_cpu_has() checks raw CPU support, and kvm_cpu_has() checks what can > be exposed to L1, i.e. the latter would check if KVM supports nested Idle > HLT. But, since the assert is purely bonus coverage, checking for CPU > support is good enough. > > Cc: Manali Shukla > Signed-off-by: Sean Christopherson > --- > tools/testing/selftests/kvm/include/x86/processor.h | 1 + > tools/testing/selftests/kvm/x86/xapic_ipi_test.c | 13 ++++++++++++- > 2 files changed, 13 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/kvm/include/x86/processor.h b/tools/testing/selftests/kvm/include/x86/processor.h > index 61578f038aff..32ab6ca7ec32 100644 > --- a/tools/testing/selftests/kvm/include/x86/processor.h > +++ b/tools/testing/selftests/kvm/include/x86/processor.h > @@ -200,6 +200,7 @@ struct kvm_x86_cpu_feature { > #define X86_FEATURE_PAUSEFILTER KVM_X86_CPU_FEATURE(0x8000000A, 0, EDX, 10) > #define X86_FEATURE_PFTHRESHOLD KVM_X86_CPU_FEATURE(0x8000000A, 0, EDX, 12) > #define X86_FEATURE_VGIF KVM_X86_CPU_FEATURE(0x8000000A, 0, EDX, 16) > +#define X86_FEATURE_IDLE_HLT KVM_X86_CPU_FEATURE(0x8000000A, 0, EDX, 30) > #define X86_FEATURE_SEV KVM_X86_CPU_FEATURE(0x8000001F, 0, EAX, 1) > #define X86_FEATURE_SEV_ES KVM_X86_CPU_FEATURE(0x8000001F, 0, EAX, 3) > #define X86_FEATURE_PERFMON_V2 KVM_X86_CPU_FEATURE(0x80000022, 0, EAX, 0) > diff --git a/tools/testing/selftests/kvm/x86/xapic_ipi_test.c b/tools/testing/selftests/kvm/x86/xapic_ipi_test.c > index b255c7fbe519..35cb9de54a82 100644 > --- a/tools/testing/selftests/kvm/x86/xapic_ipi_test.c > +++ b/tools/testing/selftests/kvm/x86/xapic_ipi_test.c > @@ -466,7 +466,18 @@ int main(int argc, char *argv[]) > cancel_join_vcpu_thread(threads[0], params[0].vcpu); > cancel_join_vcpu_thread(threads[1], params[1].vcpu); > > - TEST_ASSERT_EQ(data->hlt_count, vcpu_get_stat(params[0].vcpu, halt_exits)); > + /* > + * If the host support Idle HLT, i.e. KVM *might* be using Idle HLT, > + * then the number of HLT exits may be less than the number of HLTs > + * that were executed, as Idle HLT elides the exit if the vCPU has an > + * unmasked, pending IRQ (or NMI). > + */ > + if (this_cpu_has(X86_FEATURE_IDLE_HLT)) > + TEST_ASSERT(data->hlt_count >= vcpu_get_stat(params[0].vcpu, halt_exits), > + "HLT insns = %lu, HLT exits = %lu", > + data->hlt_count, vcpu_get_stat(params[0].vcpu, halt_exits)); > + else > + TEST_ASSERT_EQ(data->hlt_count, vcpu_get_stat(params[0].vcpu, halt_exits)); > > fprintf(stderr, > "Test successful after running for %d seconds.\n" > > base-commit: fed48e2967f402f561d80075a20c5c9e16866e53 Tested on Genoa and Turin systems to cover both scenarios: CPU supports idle HLT intercept and CPU doesn't support idle HLT intercept. Tested-by: Manali Shukla