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xen-devel
Re: [Xen-devel] [PATCH] Fix for AMD erratum 383 on Family 10h CPUs
>>> Wei Huang <wei.huang2@xxxxxxx> 17.05.10 20:57 >>>
>This patches implements the workaround of AMD erratum 383 on family 10h
>CPUs. It destroys the guest VM when a MC error with a special pattern is
>detected. Without this patch, a guest VM failure can potentially crash
>Xen hypervisor and the whole system. The erratum will be published in
>next version of guide.
While I realize that the patch has already been applied, I still have
some reservations:
- It fiddles with bit 47 of MSR_AMD64_DC_CFG *and* marks that the
erratum is present. Normally I would expect that MSR modifications
are done to work around an erratum, but here it is completely
unclear what the modification is good for.
- It clears all MCi_STATUS registers, despite (as I understand it) the
problem only involving bank 0.
- It flushes the TLBs for the affected domain - shouldn't this be done
globally, if it is necessary at all?
- Is it guaranteed that the #MC cannot happen when a #VMEXIT is
already being processed by the CPU?
Jan
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