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.
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