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powerpc/64s: system call avoid setting MSR[RI] until we set MSR[EE]

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This extends the MSR[RI]=0 window a little further into the system
call in order to pair RI and EE enabling with a single mtmsrd.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210617155116.2167984-8-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-06-18 01:51:06 +10:00 committed by Michael Ellerman
parent e754f4d13e
commit dd152f70bd
2 changed files with 2 additions and 4 deletions
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2
arch/powerpc/kernel/exceptions-64s.S
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@ -1861,8 +1861,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
mtctr r10
bctr
.else
li r10,MSR_RI
mtmsrd r10,1 /* Set RI (EE=0) */
#ifdef CONFIG_RELOCATABLE
__LOAD_HANDLER(r10, system_call_common)
mtctr r10

4
arch/powerpc/kernel/interrupt_64.S
View file

@ -283,9 +283,9 @@ END_BTB_FLUSH_SECTION
* trace_hardirqs_off().
*/
li r11,IRQS_ALL_DISABLED
li r12,PACA_IRQ_HARD_DIS
li r12,-1 /* Set MSR_EE and MSR_RI */
stb r11,PACAIRQSOFTMASK(r13)
stb r12,PACAIRQHAPPENED(r13)
mtmsrd r12,1
/* Calling convention has r9 = orig r0, r10 = regs */
mr r9,r0