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| author | Paul Mackerras <paulus@samba.org> | 2011-04-05 13:59:58 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-04-20 11:03:23 +1000 |
| commit | 673b189a2e3353061fa8c49515d1014dab6ad9b9 (patch) | |
| tree | 71d5842f2dcfcd24370ef25f35c97f0f81ebae87 /arch/powerpc/kvm | |
| parent | b3e6b5dfcf0974069a8ddcce7dd071120d20d79c (diff) | |
| download | linux-3.10-673b189a2e3353061fa8c49515d1014dab6ad9b9.tar.gz linux-3.10-673b189a2e3353061fa8c49515d1014dab6ad9b9.tar.bz2 linux-3.10-673b189a2e3353061fa8c49515d1014dab6ad9b9.zip | |
powerpc: Always use SPRN_SPRG_HSCRATCH0 when running in HV mode
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>
Diffstat (limited to 'arch/powerpc/kvm')
| -rw-r--r-- | arch/powerpc/kvm/book3s_rmhandlers.S | 6 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_segment.S | 2 |
2 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/kvm/book3s_rmhandlers.S b/arch/powerpc/kvm/book3s_rmhandlers.S index 046e1f3d443..ae99af66ca3 100644 --- a/arch/powerpc/kvm/book3s_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_rmhandlers.S @@ -70,7 +70,7 @@ .global kvmppc_trampoline_\intno kvmppc_trampoline_\intno: - mtspr SPRN_SPRG_SCRATCH0, r13 /* Save r13 */ + SET_SCRATCH0(r13) /* Save r13 */ /* * First thing to do is to find out if we're coming @@ -89,7 +89,7 @@ kvmppc_trampoline_\intno: lwz r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13) mtcr r12 PPC_LL r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13) - mfspr r13, SPRN_SPRG_SCRATCH0 /* r13 = original r13 */ + GET_SCRATCH0(r13) /* r13 = original r13 */ b kvmppc_resume_\intno /* Get back original handler */ /* Now we know we're handling a KVM guest */ @@ -157,7 +157,7 @@ kvmppc_handler_skip_ins: lwz r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH1)(r13) mtcr r12 PPC_LL r12, (SHADOW_VCPU_OFF + SVCPU_SCRATCH0)(r13) - mfspr r13, SPRN_SPRG_SCRATCH0 + GET_SCRATCH0(r13) /* And get back into the code */ RFI diff --git a/arch/powerpc/kvm/book3s_segment.S b/arch/powerpc/kvm/book3s_segment.S index d842795d0f2..451264274b8 100644 --- a/arch/powerpc/kvm/book3s_segment.S +++ b/arch/powerpc/kvm/book3s_segment.S @@ -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) |