Re: [PATCH v2 0/4] perf/x86: Don't write PEBS_ENABLED on KVM transitions

[Jim Mattson]

On Thu, Apr 23, 2026 at 8:03 AM Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
> ...
>  - Dropping PEBS_ENABLED from the lists save three MSR writes, not two, as
>    KVM performs an explicit WRMSR prior to VM-Entry to guarantee PEBS is
>    quiesced.

Is the wrmsrq(MSR_IA32_PEBS_ENABLED, 0) in add_atomic_switch_msr()
necessary when the CPU has PEBS isolation?