Re: [Xen-devel] [PATCH v2 12/14] x86/cpufeatures: Hide Instruction Based Sampling from guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.01.17 at 15:39, <andrew.cooper3@xxxxxxxxxx> wrote:
> Xen advertises the IBS feature flag to guests on capable AMD hardware.
> However, the PV path in Xen, and both the PV and HVM paths in libxc
> deliberately clobber the IBS CPUID leaf.
> 
> Furthermore, Xen has nothing providing an implementation of the IBS MSRs, so
> guests can't actually use the feature at all.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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