| Message ID | 1625825111-6604-4-git-send-email-weijiang.yang@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Introduce Architectural LBR for vPMU | expand |
On Fri, Jul 9, 2021 at 2:51 AM Yang Weijiang <weijiang.yang@intel.com> wrote: > > Arch LBR MSR_ARCH_LBR_DEPTH and MSR_ARCH_LBR_CTL are {saved|restored} > by userspace application if they're available. > > Suggested-by: Jim Mattson <jmattson@google.com> > Signed-off-by: Yang Weijiang <weijiang.yang@intel.com> Reviewed-by: Jim Mattson <jmattson@google.com>
On Fri, Jul 09, 2021 at 11:24:46AM -0700, Jim Mattson wrote: > On Fri, Jul 9, 2021 at 2:51 AM Yang Weijiang <weijiang.yang@intel.com> wrote: > > > > Arch LBR MSR_ARCH_LBR_DEPTH and MSR_ARCH_LBR_CTL are {saved|restored} > > by userspace application if they're available. > > > > Suggested-by: Jim Mattson <jmattson@google.com> > > Signed-off-by: Yang Weijiang <weijiang.yang@intel.com> > Reviewed-by: Jim Mattson <jmattson@google.com> Thanks Jim for review!
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e0f4a46649d7..b586a45fce2b 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1298,6 +1298,7 @@ static const u32 msrs_to_save_all[] = { MSR_ARCH_PERFMON_EVENTSEL0 + 12, MSR_ARCH_PERFMON_EVENTSEL0 + 13, MSR_ARCH_PERFMON_EVENTSEL0 + 14, MSR_ARCH_PERFMON_EVENTSEL0 + 15, MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17, + MSR_ARCH_LBR_CTL, MSR_ARCH_LBR_DEPTH, }; static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)]; @@ -6049,6 +6050,11 @@ static void kvm_init_msr_list(void) min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp)) continue; break; + case MSR_ARCH_LBR_DEPTH: + case MSR_ARCH_LBR_CTL: + if (!kvm_cpu_cap_has(X86_FEATURE_ARCH_LBR)) + continue; + break; default: break; }
Arch LBR MSR_ARCH_LBR_DEPTH and MSR_ARCH_LBR_CTL are {saved|restored} by userspace application if they're available. Suggested-by: Jim Mattson <jmattson@google.com> Signed-off-by: Yang Weijiang <weijiang.yang@intel.com> --- arch/x86/kvm/x86.c | 6 ++++++ 1 file changed, 6 insertions(+)