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| author | Mihai Caraman <mihai.caraman@freescale.com> | 2012-08-06 03:27:07 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-09-05 15:35:52 +1000 |
| commit | 8b64a9dfb091f1eca8b7e58da82f1e7d1d5fe0ad (patch) | |
| tree | 9d0bfd7ecd07c02fef68e7b198a0560340bf0846 /arch/powerpc/mm | |
| parent | 79b5c8dbaa4528a6fd03a4d9d8a6d56a46293a3a (diff) | |
| download | linux-8b64a9dfb091f1eca8b7e58da82f1e7d1d5fe0ad.tar.bz2 | |
powerpc/booke64: Use SPRG0/3 scratch for bolted TLB miss & crit int
Embedded.Hypervisor category defines GSPRG0..3 physical registers for guests.
Avoid SPRG4-7 usage as scratch in host exception handlers, otherwise guest
SPRG4-7 registers will be clobbered.
For bolted TLB miss exception handlers, which is the version currently
supported by KVM, use SPRN_SPRG_GEN_SCRATCH aka SPRG0 instead of
SPRN_SPRG_TLB_SCRATCH aka SPRG6. Keep using TLB PACA slots to fit in one
64-byte cache line.
For critical exception handlers use SPRG3 instead of SPRG7. Provide a routine
to store and restore user-visible SPRGs. This will be subsequently used
to restore VDSO information in SPRG3. Add EX_R13 to paca slots to free up
SPRG3 and change the critical exception epilog to use it.
Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/tlb_low_64e.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/mm/tlb_low_64e.S b/arch/powerpc/mm/tlb_low_64e.S index d884fa44d34f..b4113bf86353 100644 --- a/arch/powerpc/mm/tlb_low_64e.S +++ b/arch/powerpc/mm/tlb_low_64e.S @@ -40,7 +40,7 @@ **********************************************************************/ .macro tlb_prolog_bolted intnum addr - mtspr SPRN_SPRG_TLB_SCRATCH,r13 + mtspr SPRN_SPRG_GEN_SCRATCH,r13 mfspr r13,SPRN_SPRG_PACA std r10,PACA_EXTLB+EX_TLB_R10(r13) mfcr r10 @@ -69,7 +69,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) ld r15,PACA_EXTLB+EX_TLB_R15(r13) TLB_MISS_RESTORE_STATS_BOLTED ld r16,PACA_EXTLB+EX_TLB_R16(r13) - mfspr r13,SPRN_SPRG_TLB_SCRATCH + mfspr r13,SPRN_SPRG_GEN_SCRATCH .endm /* Data TLB miss */ |