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powerpc/64s/exception: machine check use correct cfar for late handler

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[ Upstream commit 0b66370c61 ]

Bare metal machine checks run an "early" handler in real mode before
running the main handler which reports the event.

The main handler runs exactly as a normal interrupt handler, after the
"windup" which sets registers back as they were at interrupt entry.
CFAR does not get restored by the windup code, so that will be wrong
when the handler is run.

Restore the CFAR to the saved value before running the late handler.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190802105709.27696-8-npiggin@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nicholas Piggin
2019-08-02 20:56:32 +10:00
committed by Chris
parent d0172fa51c
commit 0b85ea5f28
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kernel/exceptions-64s.S
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@@ -467,6 +467,10 @@ EXC_COMMON_BEGIN(machine_check_handle_early)
RFI_TO_USER_OR_KERNEL
9:
/* Deliver the machine check to host kernel in V mode. */
BEGIN_FTR_SECTION
ld r10,ORIG_GPR3(r1)
mtspr SPRN_CFAR,r10
END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
MACHINE_CHECK_HANDLER_WINDUP
b machine_check_pSeries