* [PATCH] powerpc/64e: Fix system call illegal mtmsrd instruction
@ 2021-07-06 5:13 Nicholas Piggin
2021-07-06 10:52 ` Michael Ellerman
0 siblings, 1 reply; 2+ messages in thread
From: Nicholas Piggin @ 2021-07-06 5:13 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin, Christian Zigotzky
BookE does not have mtmsrd, switch to use wrteei to enable MSR[EE].
Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Fixes: dd152f70bdc1 ("powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE]")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
This wasn't caught by QEMU because it executes mtmsrd just fine on BookE
CPUs. Patching that reproduces the problem and verifies this fix.
arch/powerpc/kernel/interrupt_64.S | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S
index 4063e8a3f704..d4212d2ff0b5 100644
--- a/arch/powerpc/kernel/interrupt_64.S
+++ b/arch/powerpc/kernel/interrupt_64.S
@@ -311,9 +311,13 @@ END_BTB_FLUSH_SECTION
* trace_hardirqs_off().
*/
li r11,IRQS_ALL_DISABLED
- li r12,-1 /* Set MSR_EE and MSR_RI */
stb r11,PACAIRQSOFTMASK(r13)
+#ifdef CONFIG_PPC_BOOK3S
+ li r12,-1 /* Set MSR_EE and MSR_RI */
mtmsrd r12,1
+#else
+ wrteei 1
+#endif
/* Calling convention has r9 = orig r0, r10 = regs */
mr r9,r0
--
2.23.0
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2021-07-06 5:13 [PATCH] powerpc/64e: Fix system call illegal mtmsrd instruction Nicholas Piggin
2021-07-06 10:52 ` Michael Ellerman
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