powerpc: In HV mode, use HSPRG0 for PACA
When running in Hypervisor mode (arch 2.06 or later), we store the PACA
in HSPRG0 instead of SPRG1. The architecture specifies that SPRGs may be
lost during a "nap" power management operation (though they aren't
currently on POWER7) and this enables use of SPRG1 by KVM guests.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index aeb739e..6784bf7 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -53,7 +53,7 @@
DO_KVM 0x300
mtspr SPRN_SPRG_SCRATCH0,r13
BEGIN_FTR_SECTION
- mfspr r13,SPRN_SPRG_PACA
+ GET_PACA(r13)
std r9,PACA_EXSLB+EX_R9(r13)
std r10,PACA_EXSLB+EX_R10(r13)
mfspr r10,SPRN_DAR
@@ -82,7 +82,7 @@
HMT_MEDIUM
DO_KVM 0x380
mtspr SPRN_SPRG_SCRATCH0,r13
- mfspr r13,SPRN_SPRG_PACA /* get paca address into r13 */
+ GET_PACA(r13)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_DAR
std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
@@ -121,7 +121,7 @@
HMT_MEDIUM
DO_KVM 0x480
mtspr SPRN_SPRG_SCRATCH0,r13
- mfspr r13,SPRN_SPRG_PACA /* get paca address into r13 */
+ GET_PACA(r13)
std r3,PACA_EXSLB+EX_R3(r13)
mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
@@ -165,7 +165,7 @@
beq- 1f
END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
mr r9,r13
- mfspr r13,SPRN_SPRG_PACA
+ GET_PACA(r13)
mfspr r11,SPRN_SRR0
ld r12,PACAKBASE(r13)
ld r10,PACAKMSR(r13)