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

Paolo Bonzini
2014-07-16T16:08:02Z

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