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x86/mce: Use severity table to handle uncorrected errors in kernel

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mce_severity_intel() has a special case to promote UC and AR errors
in kernel context to PANIC severity.

The "AR" case is already handled with separate entries in the severity
table for all instruction fetch errors, and those data fetch errors that
are not in a recoverable area of the kernel (i.e. have an extable fixup
entry).

Add an entry to the severity table for UC errors in kernel context that
reports severity = PANIC. Delete the special case code from
mce_severity_intel().

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220922195136.54575-2-tony.luck@intel.com
This commit is contained in:
Tony Luck 2022-09-22 12:51:35 -07:00 • committed by Borislav Petkov
parent bc1b705b0e
commit a51cbd0d86
1 changed files with 5 additions and 3 deletions
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8
arch/x86/kernel/cpu/mce/severity.c
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@ -202,6 +202,11 @@ static struct severity {
PANIC, "Overflowed uncorrected",
BITSET(MCI_STATUS_OVER|MCI_STATUS_UC)
),
MCESEV(
PANIC, "Uncorrected in kernel",
BITSET(MCI_STATUS_UC),
KERNEL
),
MCESEV(
UC, "Uncorrected",
BITSET(MCI_STATUS_UC)
@ -391,9 +396,6 @@ static noinstr int mce_severity_intel(struct mce *m, struct pt_regs *regs, char
*msg = s->msg;
s->covered = 1;
if (s->sev >= MCE_UC_SEVERITY && ctx == IN_KERNEL)
return MCE_PANIC_SEVERITY;
return s->sev;
}
}