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Re: [Xen-devel] [PATCH 2/6] x86emul: support WBNOINVD


  • To: Jan Beulich <jbeulich@xxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 28 Aug 2019 12:42:44 +0100
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  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, RogerPau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Wed, 28 Aug 2019 11:42:56 +0000
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On 27/08/2019 17:45, Andrew Cooper wrote:
> AMD explicitly doesn't have leaf 4.  Their leaf 0x8000001d is similar in
> behaviour (by having subleafs), and is mostly compatible, but
> irritatingly doesn't have an identical data layout.
>
> I've got another query out with AMD because the documentation for this
> leaf alone claims that CPUID will #UD with an out-of-range subleaf, and
> I don't believe this can be true.

Current feedback is that this looks like a documentation bug, and that
CPUs don't actually behave like that.

~Andrew

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