Re: [PATCH 11/15] KVM: x86/pmu: Emulate streamlined Freeze-LBR-on-PMI

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From: Sean Christopherson

Date: Tue Jul 28 2026 - 15:40:49 EST

On Tue, Jul 07, 2026, Zide Chen wrote:
> PerfMon v4 streamlined the Freeze-LBR-on-PMI mechanism. When
> DEBUGCTLMSR_FREEZE_LBRS_ON_PMI is set and a PMI fires, hardware sets
> IA32_PERF_GLOBAL_STATUS.LBR_Frz instead of clearing DEBUGCTLMSR_LBR.

But KVM doesn't even support LBRs for the mediated PMU?