Re: [Xen-devel] [PATCH] X86/VPMU: mask off uncore overflow bit on xeon phi knights landing

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.12.16 at 04:17, <luwei.kang@xxxxxxxxx> wrote:
> IA32_PERF_GLOBAL_STATUS.OvfUncore (MSR 38EH, bit[61]) is always 0 and
> writing 1 to IA32_PERF_GLOBAL_OVF_CTRL.ClrOvfUncore (MSR 390H, bit[61])
> signals #GP.
> Reference "Intel Xeon Phi Procssor x200 Product Family", document
> number 334646-008.

I can see this being a necessary workaround, but going over the
other errata there are some of quite a bit higher importance to
work around (KNL13) or at least check whether we're affected
(KNL4, KNL8), if we really care about supporting Xen on this
processor model. I'd appreciate other opinions namely from the
people on Cc.

Jan


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