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

On Tue, Oct 14, 2014 at 07:07:32AM +0000, Zhang, Yang Z 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?

Sandy Bridge and Ivy Bridge.


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