Messages in this thread | | | From | Jim Mattson <> | Date | Mon, 9 Nov 2020 14:36:29 -0800 | Subject | Re: [tip: ras/core] x86/mce: Enable additional error logging on certain Intel CPUs |
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On Mon, Nov 9, 2020 at 2:09 PM Luck, Tony <tony.luck@intel.com> wrote: > > What does KVM do with model specific MSRs?
"Model specific model-specific registers?" :-)
KVM only implements a small subset of MSRs. By default, any access to the rest raises #GP.
> Looks like you let the guest believe it was running on one of Sandy Bridge, Ivy Bridge, Haswell (Xeon). > > So, the core MCE code tried to enable extended error reporting. > > If there is a mode to have KVM let the guest think that it read/wrote MSR 0x17F, > but actually, doesn't do it ... that would seem to be a reasonable thing to do here.
There is an 'ignore_msrs' module parameter, to sink writes and return zero on reads for unknown MSRs, but I don't think it's commonly used.
I thought Linux had long ago gone the route of turning rdmsr/wrmsr into rdmsr_safe/wrmsr_safe, so that the guest would ignore the #GPs on writes and return zero to the caller for #GPs on reads.
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