Re: [Xen-devel] [PATCH v2 05/14] x86/cpuid: Handle leaf 0x80000001 in guest_cpuid()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.01.17 at 15:39, <andrew.cooper3@xxxxxxxxxx> wrote:
> Intel reserve eax and ebx, while AMD duplicates eax from the low
> family/model/stepping leaf.  For AMD, ebx contains further brand/package
> information which is left as the toolstack chooses (other than bits 27:16
> which are reserved).
> 
> While moving the dynamic adjustments from the legacy path, simplify the shadow
> PSE36 adjustment.  PAE paging is a prerequisite for enabling long mode, making
> the long mode check redundant; the case where it doesn't get short circuited
> is the case where it is architecturally 0.  Make the same adjustment to the
> leaf 1 legacy path.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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