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SubjectRe: [PATCH 1/4] KVM: x86: Disable intercept for CORE cstate read
On Mon, 20 May 2019 at 18:30, Paolo Bonzini <> wrote:
> On 17/05/19 10:49, Wanpeng Li wrote:
> > From: Wanpeng Li <>
> >
> > Allow guest reads CORE cstate when exposing host CPU power management capabilities
> > to the guest. PKG cstate is restricted to avoid a guest to get the whole package
> > information in multi-tenant scenario.
> Hmm, I am not sure about this. I can see why it can be useful to run
> turbostat in the guest, but is it a good idea to share it with the


> guest, since it counts from machine reset rather than from VM reset?

I also saw amazon expose these in their nitro c5 instance.

> Maybe it could use a separate bit for KVM_CAP_X86_DISABLE_EXITS?

It could be.

Wanpeng Li

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