linux-kernel - [PATCH 5.7 473/477] powerpc/64s: Fix KVM interrupt using wrong save area

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Date:   Tue, 23 Jun 2020 21:57:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christian Zigotzky <chzigotzky@...osoft.de>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 5.7 473/477] powerpc/64s: Fix KVM interrupt using wrong save area

From: Nicholas Piggin <npiggin@...il.com>

commit 0bdcfa182506526fbe4e088ff9ca86a31b81828d upstream.

The CTR register reload in the KVM interrupt path used the wrong save
area for SLB (and NMI) interrupts.

Fixes: 9600f261acaa ("powerpc/64s/exception: Move KVM test to common code")
Cc: stable@...r.kernel.org # v5.7+
Reported-by: Christian Zigotzky <chzigotzky@...osoft.de>
Signed-off-by: Nicholas Piggin <npiggin@...il.com>
Tested-by: Christian Zigotzky <chzigotzky@...osoft.de>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20200615061247.1310763-1-npiggin@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/kernel/exceptions-64s.S |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -270,7 +270,7 @@ BEGIN_FTR_SECTION
 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
 	.endif
 
-	ld	r10,PACA_EXGEN+EX_CTR(r13)
+	ld	r10,IAREA+EX_CTR(r13)
 	mtctr	r10
 BEGIN_FTR_SECTION
 	ld	r10,IAREA+EX_PPR(r13)
@@ -298,7 +298,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
 
 	.if IKVM_SKIP
 89:	mtocrf	0x80,r9
-	ld	r10,PACA_EXGEN+EX_CTR(r13)
+	ld	r10,IAREA+EX_CTR(r13)
 	mtctr	r10
 	ld	r9,IAREA+EX_R9(r13)
 	ld	r10,IAREA+EX_R10(r13)