Re: Standardizing an MSR or other hypercall to get an RNG seed?

Paolo Bonzini
2014-09-19T06:04:44Z

Il 18/09/2014 23:54, David Hepkin ha scritto:
> The chief advantage I see to using a hypercall based mechanism is
> that it would work across more architectures. MSR's and CPUID's are
> specific to X86. If we ever wanted this same mechanism to be
> available on an architecture that doesn't support MSR's, a hypercall
> based approach would allow for a more consistent mechanism across the
> architectures.
>
> I agree, though, that converging on a common hypercall interface that
> would be implemented by all of the hypervisors would likely be much
> harder to achieve.

There are differences between architectures at the hypercall level,
starting with the calling convention. So I don't think it makes much
sense to use a hypercall.

Paolo