From: Mingwei Zhang <mizhang@xxxxxxxxxx> Clear RDPMC_EXITING in vmcs cpu based execution control to allow rdpmc instruction to proceed without VMEXIT. This gives performance to passthrough PMU. Clear RDPMC in vmx_vcpu_after_set_cpuid() when guest enables PMU and passthrough PMU is allowed. The passthrough RDPMC allows guest to read several PMU MSRs including unexposed counters like fixed counter 3 as well as IA32_PERF_METRICS. To cope with this issue, these MSRs will be cleared in later commits when context switching to VM guest. Co-developed-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx> Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx> Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx> --- arch/x86/kvm/vmx/vmx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index e4610b80e519..33cb69ff0804 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7819,6 +7819,9 @@ static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) vmx->msr_ia32_feature_control_valid_bits &= ~FEAT_CTL_SGX_LC_ENABLED; + if (is_passthrough_pmu_enabled(&vmx->vcpu)) + exec_controls_clearbit(vmx, CPU_BASED_RDPMC_EXITING); + /* Refresh #PF interception to account for MAXPHYADDR changes. */ vmx_update_exception_bitmap(vcpu); } -- 2.34.1
