Messages in this thread | | | Date | Wed, 27 Aug 2014 00:07:32 -0700 | From | "H. Peter Anvin" <> | Subject | Re: GET_RNG_SEED hypercall ABI? (Re: [PATCH v5 0/5] random,x86,kvm: Rework arch RNG seeds and get some from kvm) |
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On 08/27/2014 12:00 AM, Paolo Bonzini wrote: > Il 27/08/2014 01:58, Andy Lutomirski ha scritto: >> hpa pointed out that the ABI that I chose (an MSR from the KVM range >> and a KVM cpuid bit) is unnecessarily KVM-specific. It would be nice >> to allocate an MSR that everyone involved can agree on and, rather >> than relying on a cpuid bit, just have the guest probe for the MSR. >> >> This leads to a few questions: >> >> 1. How do we allocate an MSR? (For background, this would be an MSR >> that either returns 64 bits of best-effort cryptographically secure >> random data or fails with #GP.) > > Ask Intel? :)
I'm going to poke around internally. Intel might as a matter of policy be reluctant to assign an MSR index specifically for software use, but I'll try to find out.
-hpa
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