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Subject[tip: ras/core] x86/mce/inject: Set the valid bit in MCA_STATUS before error injection
The following commit has been merged into the ras/core branch of tip:

Commit-ID: 1e56279a49168f24b2b58e843ae92976f90a98a6
Gitweb: https://git.kernel.org/tip/1e56279a49168f24b2b58e843ae92976f90a98a6
Author: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
AuthorDate: Thu, 04 Nov 2021 16:58:42 -05:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Wed, 08 Dec 2021 12:01:01 +01:00

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

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
---
arch/x86/kernel/cpu/mce/inject.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/cpu/mce/inject.c b/arch/x86/kernel/cpu/mce/inject.c
index 725e8e4..6eac840 100644
--- a/arch/x86/kernel/cpu/mce/inject.c
+++ b/arch/x86/kernel/cpu/mce/inject.c
@@ -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;

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