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powerpc: Always use SPRN_SPRG_HSCRATCH0 when running in HV mode

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This uses feature sections to arrange that we always use HSPRG1
as the scratch register in the interrupt entry code rather than
SPRG2 when we're running in hypervisor mode on POWER7.  This will
ensure that we don't trash the guest's SPRG2 when we are running
KVM guests.  To simplify the code, we define GET_SCRATCH0() and
SET_SCRATCH0() macros like the GET_PACA/SET_PACA macros.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Paul Mackerras
2011-04-05 13:59:58 +10:00
committed by Benjamin Herrenschmidt
parent b3e6b5dfcf
commit 673b189a2e
7 changed files with 41 additions and 28 deletions
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2
arch/powerpc/kvm/book3s_segment.S
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@@ -168,7 +168,7 @@ kvmppc_handler_trampoline_exit:
PPC_STL r4, (SHADOW_VCPU_OFF + SVCPU_SHADOW_SRR1)(r13)
/* Get scratch'ed off registers */
mfspr r9, SPRN_SPRG_SCRATCH0
GET_SCRATCH0(r9)
PPC_LL r8, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13)
lwz r7, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13)