x86/mce: Check whether writes to MCA_STATUS are getting ignored

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The platform can sometimes - depending on its settings - cause writes
to MCA_STATUS MSRs to get ignored, regardless of HWCR[McStatusWrEn]'s
value.

For further info see

  PPR for AMD Family 19h, Model 01h, Revision B1 Processors, doc ID 55898

at https://bugzilla.kernel.org/show_bug.cgi?id=206537.

Therefore, probe for ignored writes to MCA_STATUS to determine if hardware
error injection is at all possible.

  [ bp: Heavily massage commit message and patch. ]

Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220214233640.70510-2-Smita.KoralahalliChannabasappa@amd.com

...

This commit is contained in:

Smita Koralahalli 2022-06-27 20:56:46 +00:00 • committed by Borislav Petkov

parent a111daf0c5

commit 891e465a1b

2 changed files with 48 additions and 1 deletions

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47

arch/x86/kernel/cpu/mce/inject.c

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2

arch/x86/kernel/cpu/mce/internal.h

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