powerpc/64s: Fix KVM interrupt using wrong save area

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@vger.kernel.org # v5.7+
Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200615061247.1310763-1-npiggin@gmail.com

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index e70ebb5..fa08069 100644 (file)
--- 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)