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authorAlexander Graf <agraf@suse.de>2010-08-05 15:44:41 +0200
committerAvi Kivity <avi@redhat.com>2010-10-24 10:52:14 +0200
commitdf08bd10266ce6132278f6b4ddc4bb0a12330b56 (patch)
treec0edb224d7b9fa46d18b66e6fcb622005f6e91c3 /arch/powerpc/kernel/kvm.c
parent9ee18b1e08e6a5648aeaaf998eabc72b5304cc17 (diff)
KVM: PPC: Make PV mtmsrd L=1 work with r30 and r31
We had an arbitrary limitation in mtmsrd L=1 that kept us from using r30 and r31 as input registers. Let's get rid of that and get more potential speedups! Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kernel/kvm.c')
-rw-r--r--arch/powerpc/kernel/kvm.c21
1 files changed, 17 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 10b681c092e..48a03386541 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -158,6 +158,7 @@ static u32 *kvm_alloc(int len)
extern u32 kvm_emulate_mtmsrd_branch_offs;
extern u32 kvm_emulate_mtmsrd_reg_offs;
+extern u32 kvm_emulate_mtmsrd_orig_ins_offs;
extern u32 kvm_emulate_mtmsrd_len;
extern u32 kvm_emulate_mtmsrd[];
@@ -186,7 +187,21 @@ static void kvm_patch_ins_mtmsrd(u32 *inst, u32 rt)
/* Modify the chunk to fit the invocation */
memcpy(p, kvm_emulate_mtmsrd, kvm_emulate_mtmsrd_len * 4);
p[kvm_emulate_mtmsrd_branch_offs] |= distance_end & KVM_INST_B_MASK;
- p[kvm_emulate_mtmsrd_reg_offs] |= rt;
+ switch (get_rt(rt)) {
+ case 30:
+ kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
+ magic_var(scratch2), KVM_RT_30);
+ break;
+ case 31:
+ kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
+ magic_var(scratch1), KVM_RT_30);
+ break;
+ default:
+ p[kvm_emulate_mtmsrd_reg_offs] |= rt;
+ break;
+ }
+
+ p[kvm_emulate_mtmsrd_orig_ins_offs] = *inst;
flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4);
/* Patch the invocation */
@@ -423,9 +438,7 @@ static void kvm_check_ins(u32 *inst, u32 features)
/* Rewrites */
case KVM_INST_MTMSRD_L1:
- /* We use r30 and r31 during the hook */
- if (get_rt(inst_rt) < 30)
- kvm_patch_ins_mtmsrd(inst, inst_rt);
+ kvm_patch_ins_mtmsrd(inst, inst_rt);
break;
case KVM_INST_MTMSR:
case KVM_INST_MTMSRD_L0: