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

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Friday, September 16, 2016 2:32 PM
> 
> 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: Kevin Tian <kevin.tian@xxxxxxxxx>

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