Messages in this thread | | | Date | Thu, 31 Jan 2013 10:29:23 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 2/3] X86: Add a check to catch Xen emulation of Hyper-V |
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On 01/31/2013 08:45 AM, Jan Beulich wrote: >>>> On 31.01.13 at 16:53, KY Srinivasan <kys@microsoft.com> wrote: >> Are there any published standards in terms of how the CPUID space should be >> populated in the range from 0x40000000 to 0x40010000. Specifically, unless > > I recall having seen this range being marked as reserved for > hypervisor use somewhere, but I don't remember where that was. >
AFAIK Intel reserves 0x40000000 to 0x4FFFFFFF for hypervisor use. Typically multivendor CPUID utilities expect "blocks" of 64K but that is not in any spec that I know of.
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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