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[0/2] AMD Zen-based IF Unit Poison Quirk

Message ID 20210504174712.27675-1-Yazen.Ghannam@amd.com (mailing list archive)
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Series AMD Zen-based IF Unit Poison Quirk | expand

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Yazen Ghannam May 4, 2021, 5:47 p.m. UTC 
From: Yazen Ghannam <yazen.ghannam@amd.com>

The Instruction Fetch unit on AMD Zen-based systems has a
microarchitectural quirk in which RIPV is not set on poison consumption
errors. However, the error is guaranteed to be delivered before a
context switch. Therefore, the CS register can be considered valid.

Patch 1 handles this behavior. Patch 2 addresses fallout from the change
in behavior in Patch 1.

Both patches Cc: stable because there have been bug reports that seem to
exhibit this behavior. There are no Fixes tags, because I don't think we
can point to specific commits that introduced this issue.

Thanks,
Yazen

Yazen Ghannam (2):
  x86/MCE: Always save CS register on AMD Zen IF errors
  x86/MCE: Don't call kill_me_now() directly

 arch/x86/kernel/cpu/mce/amd.c      | 17 +++++++++++++++++
 arch/x86/kernel/cpu/mce/core.c     | 12 ++++++++----
 arch/x86/kernel/cpu/mce/internal.h |  2 ++
 3 files changed, 27 insertions(+), 4 deletions(-)