On 27/07/2015 19:51, Andy Lutomirski wrote:
> > > I think I'm missing something. Does KVM_GUEST hook read_msr and
> > > write_msr? I don't see it.
> >
> > PARAVIRT does, and it's the main reason why you'd want PARAVIRT for a
> > KVM guest.
>
> Still confused. On a KVM guest (with PARAVIRT=y), doesn't read_msr do
> exactly the same thing it does on native, albeit with more indirection
> and patching involved?
With PARAVIRT=y it never #GPs:
.read_msr = native_read_msr_safe,
.write_msr = native_write_msr_safe,
I don't remember if it's this way on bare-metal too.
Paolo
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