Re: [Patch v3] Enable CPU SMEP feature for KVM

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On 05/29/2011 10:15 AM, Li, Xin wrote:
>  >  >
>  >  >   >   +		else
>  >  >   >   +			best->ebx&= ~(bit(X86_FEATURE_SMEP));
>  >  >
>  >  >   Not needed - x86.c already masks unsupported features.
>  >
>  >  Should KVM still support guest SMEP when host disables it thru nosmep?
>
>  No.  We treat nosmep as "no smep for the kernel and any guests".  NX is
>  treated in the same way.

Then we need to add logic to do_cpuid_ent to mask off leaf 7 features when host
disables it.

Yes.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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