[Xen-devel] [PATCH] Fix MCA CMCI msr write error

["Ke, Liping" <liping.ke@xxxxxxxxx>]

Hi, all
This patch is a small fix for avoiding gpf when writing non-zero value to MCA 
MCi_STATUS MSRs. According to spec, MCi_STATUS MSR could only 
be cleared to 0s.
This error is found when doing cpu-offline cmci happens.

For avoiding missing future cmci after changing cmci owner, we need to
process pending cmci errors to clear MCi_STATUS MSRs. 
Since error count (38~52bit in MCi_STATUS) meet threasholds yet not cleared, 
this error might not be triggered for long.

Thanks a lot!
Criping

Attachment: cmci_gpf.patch
Description: cmci_gpf.patch

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