Re: [RESEND v13 00/10] KVM: x86/pmu: Guest Last Branch Recording Enabling

Alex Shi
2021-01-15T08:20:13Z

在 2021/1/8 上午9:36, Like Xu 写道:
> Because saving/restoring tens of LBR MSRs (e.g. 32 LBR stack entries) in
> VMX transition brings too excessive overhead to frequent vmx transition
> itself, the guest LBR event would help save/restore the LBR stack msrs
> during the context switching with the help of native LBR event callstack
> mechanism, including LBR_SELECT msr.
>

Sounds the feature is much helpful for VMM guest performance tunning.
Good job!

Thanks
Alex