[linux-safety] [PATCH 3/4] x86/mce: for LMCE panic only if mca_cfg.tolerant < 3

Paoloni, Gabriele
2020-11-18T15:16:08Z

Right now for LMCE if no_way_out is set mce_panic() is called
regardless of mca_cfg.tolerant. This is not correct as if
mca_cfg.tolerant = 3 we should never panic.

Signed-off-by: Gabriele Paoloni <gabriele.paoloni@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
arch/x86/kernel/cpu/mce/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index e025ff04438f..d16cbb05b09c 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1367,7 +1367,7 @@ noinstr void do_machine_check(struct pt_regs *regs)
* to see it will clear it.
*/
if (lmce) {
- if (no_way_out)
+ if (no_way_out && mca_cfg.tolerant < 3)
mce_panic("Fatal local machine check", &m, msg);
} else {
order = mce_start(&no_way_out);
--
2.20.1

---------------------------------------------------------------------
INTEL CORPORATION ITALIA S.p.A. con unico socio
Sede: Milanofiori Palazzo E 4
CAP 20094 Assago (MI)
Capitale Sociale Euro 104.000,00 interamente versato
Partita I.V.A. e Codice Fiscale 04236760155
Repertorio Economico Amministrativo n. 997124
Registro delle Imprese di Milano nr. 183983/5281/33
Soggetta ad attivita' di direzione e coordinamento di
INTEL CORPORATION, USA

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.

-=-=-=-=-=-=-=-=-=-=-=-
Links: You receive all messages sent to this group.
View/Reply Online (#176): https://lists.elisa.tech/g/linux-safety/message/176
Mute This Topic: https://lists.elisa.tech/mt/78342500/5278000