On 04/23/2013 04:41 PM, Borislav Petkov wrote:
>
> Btw, in thinking about this more, I'm kinda sceptical we want to use the
> CPUID layout for this new KVM_GET_EMULATED_* ioctl. And the reason why
> I'm sceptical is that not every instruction is behind a CPUID capability
> bit and if we want to tell userspace that we do emulate any insn, even
> one for which there's no CPUID bit, we're going to have to either
> simulate a kvm-specific CPUID leaf or, maybe even better, come up with
> our own format for emulated capabilities. Maybe a bit vector with set
> bits for the respective capability, or something more nifty.
>
> In any case, it doesn't really need to be CPUID-like, IMHO.
>
Using CPUID has the major advantage that it is well-defined.
-hpa
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