Re: [PATCH v6 2/5] KVM: x86: Add IBPB support

[David Woodhouse]

On Fri, 2018-02-02 at 15:28 -0500, Konrad Rzeszutek Wilk wrote:
> 
> >Â
> > No. The AMD feature bits give us more fine-grained support for exposing
> > IBPB or IBRS alone, so we expose those bits on Intel too.
> 
> But but.. that runs smack against the idea of exposing a platform that
> is as close to emulating the real hardware as possible.
> 
> As in I would never expect an Intel CPU to expose the IBPB on the 0x8000_0008
> leaf. Hence KVM (nor any hypervisor) should not do it either.
> 
> Unless Intel is doing it? Did I miss a new spec update?

Are you telling me there's no way you can infer from CPUID that you're
running in a hypervisor?

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