Messages in this thread | | | Date | Thu, 11 Apr 2024 13:21:20 -0400 | Subject | Re: [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU_PASSTHROUGH | From | "Liang, Kan" <> |
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On 2024-04-11 1:04 p.m., Sean Christopherson wrote: > On Fri, Jan 26, 2024, Xiong Zhang wrote: >> From: Kan Liang <kan.liang@linux.intel.com> >> >> Define and apply the PERF_PMU_CAP_VPMU_PASSTHROUGH flag for the version 4 >> and later PMUs > > Why? I get that is an RFC, but it's not at all obvious to me why this needs to > take a dependency on v4+.
The IA32_PERF_GLOBAL_STATUS_RESET/SET MSRs are introduced in v4. They are used in the save/restore of PMU state. Please see PATCH 23/41. So it's limited to v4+ for now.
Thanks, Kan
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