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powerpc/64s: Fix system reset interrupt winkle wakeups

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Wakeups from winkle set the low bit of the HSPRG0 register, to
distinguish it from other sleep states. This is also the PACA pointer.
The system reset exception handler fails to mask this bit away before
using this value before using it as the PACA pointer.

Fix this by adding a new type of exception prolog macro where we already
have the PACA set in r13, and have the system reset vector mask it out.
The winkle wakeup handler will store the masked value back into HSPRG0.

Fixes: fb479e44a9 ("powerpc/64s: relocation, register save fixes for system reset interrupt")
Cc: stable@vger.kernel.org # v3.0+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2016-11-02 17:57:01 +11:00
committed by Michael Ellerman
parent fb479e44a9
commit f23ed166f2
2 changed files with 19 additions and 5 deletions
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13
arch/powerpc/include/asm/exception-64s.h
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@@ -158,14 +158,17 @@ BEGIN_FTR_SECTION_NESTED(943) \
std ra,offset(r13); \
END_FTR_SECTION_NESTED(ftr,ftr,943)
#define EXCEPTION_PROLOG_0(area) \
GET_PACA(r13); \
#define EXCEPTION_PROLOG_0_PACA(area) \
std r9,area+EX_R9(r13); /* save r9 */ \
OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR); \
HMT_MEDIUM; \
std r10,area+EX_R10(r13); /* save r10 - r12 */ \
OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
#define EXCEPTION_PROLOG_0(area) \
GET_PACA(r13); \
EXCEPTION_PROLOG_0_PACA(area)
#define __EXCEPTION_PROLOG_1(area, extra, vec) \
OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR); \
OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR); \
@@ -196,6 +199,12 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
EXCEPTION_PROLOG_1(area, extra, vec); \
EXCEPTION_PROLOG_PSERIES_1(label, h);
/* Have the PACA in r13 already */
#define EXCEPTION_PROLOG_PSERIES_PACA(area, label, h, extra, vec) \
EXCEPTION_PROLOG_0_PACA(area); \
EXCEPTION_PROLOG_1(area, extra, vec); \
EXCEPTION_PROLOG_PSERIES_1(label, h);
#define __KVMTEST(h, n) \
lbz r10,HSTATE_IN_GUEST(r13); \
cmpwi r10,0; \