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powerpc: In HV mode, use HSPRG0 for PACA

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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>
This commit is contained in:
Benjamin Herrenschmidt
2011-01-20 17:50:21 +11:00
parent 24cc67de62
commit 2dd60d79e0
7 changed files with 50 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/powerpc/kernel/exceptions-64s.S
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@@ -53,7 +53,7 @@ data_access_pSeries:
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 @@ data_access_slb_pSeries:
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 @@ instruction_access_slb_pSeries:
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 @@ BEGIN_FTR_SECTION
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)