Re: [Xen-devel] PC8 Residency on Broadwell hardware

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.09.16 at 10:47, <andrew.cooper3@xxxxxxxxxx> wrote:
> c/s 350bc1a9d4 "x86: support newer Intel CPU models" changed the set of
> MSRs read by Xeon Broadwell hardware (specifically, model 79 / 0x47).
> 
> Rereading the manual, it does indeed indicate that this MSR is available.
> 
> However, experimentally it is not.  All Broadwell hardware XenServer has
> (both SDPs and production systems) reliably take a #GP fault when trying
> to read this MSR.  Haswell hardware appears fine (and indeed, was
> reading that MSR before).
> 
> Intel: Please can you confirm whether the documentation is correct?  If
> it is, do you have any idea why the MSR might not be available?  I can't
> spot anything relevant in the platform errata documents.

And indeed I had requested this same information already well over
a week ago, without having heard back.

Jan


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