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x86/mce/inject: Set the valid bit in MCA_STATUS before error injection

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MCA handlers check the valid bit in each status register
(MCA_STATUS[Val]) and continue processing the error only if the valid
bit is set.

Set the valid bit unconditionally in the corresponding MCA_STATUS
register and correct any Val=0 injections made by the user as such
errors will get ignored and such injections will be largely pointless.

Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211104215846.254012-3-Smita.KoralahalliChannabasappa@amd.com
This commit is contained in:
Smita Koralahalli 2021-11-04 16:58:42 -05:00 • committed by Borislav Petkov
parent e48d008bd1
commit 1e56279a49
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kernel/cpu/mce/inject.c
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@ -503,6 +503,8 @@ static void do_inject(void)
i_mce.tsc = rdtsc_ordered();
i_mce.status |= MCI_STATUS_VAL;
if (i_mce.misc)
i_mce.status |= MCI_STATUS_MISCV;