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powerpc/booke64: Use SPRG_TLB_EXFRAME on bolted handlers

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While bolted handlers (including e6500) do not need to deal with a TLB
miss recursively causing another TLB miss, nested TLB misses can still
happen with crit/mc/debug exceptions -- so we still need to honor
SPRG_TLB_EXFRAME.

We don't need to spend time modifying it in the TLB miss fastpath,
though -- the special level exception will handle that.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Mihai Caraman <mihai.caraman@freescale.com>
Cc: kvm-ppc@vger.kernel.org
This commit is contained in:
Scott Wood 2014-03-10 17:29:38 -05:00
commit a3dc620743
4 changed files with 42 additions and 31 deletions
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8
arch/powerpc/include/asm/kvm_booke_hv_asm.h
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@ -45,10 +45,12 @@
*
* Expected inputs (TLB exception type):
* r10 = saved CR
* r12 = extlb pointer
* r13 = PACA_POINTER
* *(r13 + PACA_EX##type + EX_TLB_R10) = saved r10
* *(r13 + PACA_EX##type + EX_TLB_R11) = saved r11
* SPRN_SPRG_GEN_SCRATCH = saved r13
* *(r12 + EX_TLB_R10) = saved r10
* *(r12 + EX_TLB_R11) = saved r11
* *(r12 + EX_TLB_R13) = saved r13
* SPRN_SPRG_GEN_SCRATCH = saved r12
*
* Only the bolted version of TLB miss exception handlers is supported now.
*/