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

[Paolo Bonzini]

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.

Paolo
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