Re: [Xen-devel] [PATCH 05/10] x86/cpuid: Handle leaf 0x5 in guest_cpuid()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.02.17 at 12:00, <andrew.cooper3@xxxxxxxxxx> wrote:
> The MONITOR flag isn't exposed to guests.  The existing toolstack logic, and
> pv_cpuid() in the hypervisor, zero the MONITOR leaf for queries.
> 
> However, the MONITOR leaf is still visible in the hardware domains native
> CPUID view, and Linux depends on this to set up C-state information.  Leak the
> hosts MONITOR leaf under the same circumstances that the MONITOR feature is
> leaked.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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