Re: [PATCH 0/4] random,x86,kvm: Add and use MSR_KVM_GET_RNG_SEED

Gleb Natapov
2014-07-16T16:21:33Z

On Wed, Jul 16, 2014 at 09:13:23AM -0700, H. Peter Anvin wrote:
> On 07/16/2014 09:08 AM, Paolo Bonzini wrote:
> > Il 16/07/2014 18:03, H. Peter Anvin ha scritto:
> >> I suggested emulating RDRAND *but not set the CPUID bit*. We already
> >> developed a protocol in KVM/Qemu to enumerate emulated features (created
> >> for MOVBE as I recall), specifically to service the semantic "feature X
> >> will work but will be substantially slower than normal."
> >
> > But those will set the CPUID bit. There is currently no way for KVM
> > guests to know if a CPUID bit is real or emulated.
> >
>
> OK, so there wasn't any protocol implemented in the end. I sit corrected.
>
That protocol that was implemented is between qemu and kvm, not kvm and a guest.

--
Gleb.