* [PATCH for 5.10] powerpc/32s: Fix RTAS machine check with VMAP stack
@ 2021-01-13 6:40 Christophe Leroy
2021-01-13 16:50 ` Sasha Levin
0 siblings, 1 reply; 2+ messages in thread
From: Christophe Leroy @ 2021-01-13 6:40 UTC (permalink / raw)
To: stable; +Cc: linux-kernel, linuxppc-dev
This is backport for 5.10
(cherry picked from commit 98bf2d3f4970179c702ef64db658e0553bc6ef3a)
When we have VMAP stack, exception prolog 1 sets r1, not r11.
When it is not an RTAS machine check, don't trash r1 because it is
needed by prolog 1.
Fixes: da7bb43ab9da ("powerpc/32: Fix vmap stack - Properly set r1 before activating MMU")
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Squash in fixup for RTAS machine check from Christophe]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/bc77d61d1c18940e456a2dee464f1e2eda65a3f0.1608621048.git.christophe.leroy@csgroup.eu
---
arch/powerpc/kernel/head_book3s_32.S | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index a0dda2a1f2df..d66da35f2e8d 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -262,10 +262,19 @@ __secondary_hold_acknowledge:
MachineCheck:
EXCEPTION_PROLOG_0
#ifdef CONFIG_PPC_CHRP
+#ifdef CONFIG_VMAP_STACK
+ mr r11, r1
+ mfspr r1, SPRN_SPRG_THREAD
+ lwz r1, RTAS_SP(r1)
+ cmpwi cr1, r1, 0
+ bne cr1, 7f
+ mr r1, r11
+#else
mfspr r11, SPRN_SPRG_THREAD
lwz r11, RTAS_SP(r11)
cmpwi cr1, r11, 0
bne cr1, 7f
+#endif
#endif /* CONFIG_PPC_CHRP */
EXCEPTION_PROLOG_1 for_rtas=1
7: EXCEPTION_PROLOG_2
--
2.25.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH for 5.10] powerpc/32s: Fix RTAS machine check with VMAP stack
2021-01-13 6:40 [PATCH for 5.10] powerpc/32s: Fix RTAS machine check with VMAP stack Christophe Leroy
@ 2021-01-13 16:50 ` Sasha Levin
0 siblings, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2021-01-13 16:50 UTC (permalink / raw)
To: Christophe Leroy; +Cc: stable, linux-kernel, linuxppc-dev
On Wed, Jan 13, 2021 at 06:40:20AM +0000, Christophe Leroy wrote:
>This is backport for 5.10
>
>(cherry picked from commit 98bf2d3f4970179c702ef64db658e0553bc6ef3a)
>
>When we have VMAP stack, exception prolog 1 sets r1, not r11.
>
>When it is not an RTAS machine check, don't trash r1 because it is
>needed by prolog 1.
>
>Fixes: da7bb43ab9da ("powerpc/32: Fix vmap stack - Properly set r1 before activating MMU")
>Cc: stable@vger.kernel.org # v5.10+
>Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
>[mpe: Squash in fixup for RTAS machine check from Christophe]
>Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
>Link: https://lore.kernel.org/r/bc77d61d1c18940e456a2dee464f1e2eda65a3f0.1608621048.git.christophe.leroy@csgroup.eu
Queued up, thanks!
--
Thanks,
Sasha
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