| Message ID | 20240506053020.3911940-28-mizhang@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Mediated Passthrough vPMU 2.0 for x86 | expand |
On 5/6/2024 1:29 PM, Mingwei Zhang wrote: > Reject PMU MSRs interception explicitly in > vmx_get_passthrough_msr_slot() since interception of PMU MSRs are > specially handled in intel_passthrough_pmu_msrs(). > > Signed-off-by: Mingwei Zhang <mizhang@google.com> > Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com> > --- > arch/x86/kvm/vmx/vmx.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > index c9de7d2623b8..62b5913abdd6 100644 > --- a/arch/x86/kvm/vmx/vmx.c > +++ b/arch/x86/kvm/vmx/vmx.c > @@ -164,7 +164,7 @@ module_param(enable_passthrough_pmu, bool, 0444); > > /* > * List of MSRs that can be directly passed to the guest. > - * In addition to these x2apic, PT and LBR MSRs are handled specially. > + * In addition to these x2apic, PMU, PT and LBR MSRs are handled specially. > */ > static u32 vmx_possible_passthrough_msrs[MAX_POSSIBLE_PASSTHROUGH_MSRS] = { > MSR_IA32_SPEC_CTRL, > @@ -694,6 +694,13 @@ static int vmx_get_passthrough_msr_slot(u32 msr) > case MSR_LBR_CORE_FROM ... MSR_LBR_CORE_FROM + 8: > case MSR_LBR_CORE_TO ... MSR_LBR_CORE_TO + 8: > /* LBR MSRs. These are handled in vmx_update_intercept_for_lbr_msrs() */ > + case MSR_IA32_PMC0 ... MSR_IA32_PMC0 + 7: > + case MSR_IA32_PERFCTR0 ... MSR_IA32_PERFCTR0 + 7: > + case MSR_CORE_PERF_FIXED_CTR0 ... MSR_CORE_PERF_FIXED_CTR0 + 2: We'd better use helpers to get the maximum supported GP and fixed counter instead of magic numbers here. There are more GP and fixed counters in the future's Intel CPUs. > + case MSR_CORE_PERF_GLOBAL_STATUS: > + case MSR_CORE_PERF_GLOBAL_CTRL: > + case MSR_CORE_PERF_GLOBAL_OVF_CTRL: > + /* PMU MSRs. These are handled in intel_passthrough_pmu_msrs() */ > return -ENOENT; > } >
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index c9de7d2623b8..62b5913abdd6 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -164,7 +164,7 @@ module_param(enable_passthrough_pmu, bool, 0444); /* * List of MSRs that can be directly passed to the guest. - * In addition to these x2apic, PT and LBR MSRs are handled specially. + * In addition to these x2apic, PMU, PT and LBR MSRs are handled specially. */ static u32 vmx_possible_passthrough_msrs[MAX_POSSIBLE_PASSTHROUGH_MSRS] = { MSR_IA32_SPEC_CTRL, @@ -694,6 +694,13 @@ static int vmx_get_passthrough_msr_slot(u32 msr) case MSR_LBR_CORE_FROM ... MSR_LBR_CORE_FROM + 8: case MSR_LBR_CORE_TO ... MSR_LBR_CORE_TO + 8: /* LBR MSRs. These are handled in vmx_update_intercept_for_lbr_msrs() */ + case MSR_IA32_PMC0 ... MSR_IA32_PMC0 + 7: + case MSR_IA32_PERFCTR0 ... MSR_IA32_PERFCTR0 + 7: + case MSR_CORE_PERF_FIXED_CTR0 ... MSR_CORE_PERF_FIXED_CTR0 + 2: + case MSR_CORE_PERF_GLOBAL_STATUS: + case MSR_CORE_PERF_GLOBAL_CTRL: + case MSR_CORE_PERF_GLOBAL_OVF_CTRL: + /* PMU MSRs. These are handled in intel_passthrough_pmu_msrs() */ return -ENOENT; }