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

H. Peter Anvin
2014-07-16T16:13:38Z

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.

-hpa