Re: [Xen-devel] [PATCH] x86/Intel: hide CPUID faulting capability from guests

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 16/09/16 07:32, Jan Beulich wrote:
> We don't currently emulate it, so guests should not be misguided to
> believe they can (try to) use it.
>
> For now, simply return zero to guests for platform MSR reads, and only
> accept (by discarding) writes of zero. If ever there will be bits we
> can safely expose to guests, let's handle them by white listing.
>
> (As a side note - according to SDM version 059 bit 31 is reserved on
> all known families.)
>
> Reported-by: Kyle Huey <me@xxxxxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxx>, but I would also 
suggest putting in a d->arch.x86_vendor check against Intel as well.
~Andrew

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