Re: [Xen-devel] x2APIC MSR range (XSA-108 follow-up)

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.10.14 at 09:07, <yang.z.zhang@xxxxxxxxx> wrote:
> Matt Wilson wrote on 2014-10-13:
>> On Mon, Oct 13, 2014 at 07:45:58AM +0100, Jan Beulich wrote:
>>> All,
>>> 
>>> during the embargo period of XSA-108 Matt pointed out that
>>> restricting the emulated MSR range to 0x800-0x8ff isn't necessarily
>>> the ultimately correct thing to do (as also noted in commit 61fdda7acf's 
> description):
>>> The x2APIC MSR range really is being specified as 0x800-0xbff, as
>>> opposed to the range considered for virtualization purposes
>>> (0x800-0x8ff). In order to determine proper behavior here we'd like
>>> to get clarification from you, particularly also in the light of
>>> probing real hardware pointing out the existence of (at least) MSRs 
> 0xa00-0xa02.
>> 
>> I recall the MSRs in question being 0xa00 and 0xa01. Perhaps 0xa02
>> also provided a value, but I'm not as sure.
> 
> Which platform are you seeing it?

Sandybridge (Romley) in my case.

Jan


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