Re: [Xen-devel] [PATCH v2 08/14] x86/cpuid: Handle leaf 0x80000008 in guest_cpuid()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.01.17 at 15:39, <andrew.cooper3@xxxxxxxxxx> wrote:
> AMD uses 24 bits in eax, although nothing thus far has ever exposed a non-zero
> guest maxphysaddr to HVM guests.

I think exposing bits 16...23 should be limited to guests with nested
virt enabled, and should also be subject to bounds checking just
like is done for maxphysaddr.

Jan


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