diff mbox series

[v2,45/52] powerpc/64s/exception: machine check windup restore cfar for host delivery

Message ID 20190620051459.29573-46-npiggin@gmail.com (mailing list archive)
State Superseded
Headers show
Series powerpc/64s interrupt handler cleanups, gasification | expand

Checks

Context Check Description
snowpatch_ozlabs/apply_patch success Successfully applied on branch next (e610a466d16a086e321f0bd421e2fc75cff28605)
snowpatch_ozlabs/checkpatch success total: 0 errors, 0 warnings, 0 checks, 10 lines checked

Commit Message

Nicholas Piggin June 20, 2019, 5:14 a.m. UTC 
Bare metal machine checks run an "early" handler in real mode which
potentially flushes faulting translation structures, among other
things, before running the main handler which reports the event.

The main handler runs as a normal interrupt handler, after a "windup"
that sets registers back as they were at interrupt entry. CFAR does
not get restored by the windup code, so add that. The current handler
does not appear to use CFAR anywhere, because the main handler is not
run if the MCE happens in kernel-mode and the user-mode message is not
a register trace. However it may be useful in some cases or future
changes (xmon, panic on mce, etc).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/kernel/exceptions-64s.S | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 61c96502d2a8..ab22af2509d8 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1205,6 +1205,10 @@  END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
 
 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
 	EXCEPTION_PROLOG_0 PACA_EXMC
 	EXCEPTION_PROLOG_1 EXC_STD, PACA_EXMC, 1, 0x200, 1, 1, 0