diff options
| author | Alexander Graf <agraf@suse.de> | 2010-08-05 15:44:41 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-10-24 10:52:14 +0200 |
| commit | df08bd10266ce6132278f6b4ddc4bb0a12330b56 (patch) | |
| tree | c0edb224d7b9fa46d18b66e6fcb622005f6e91c3 /arch/powerpc/kernel/kvm.c | |
| parent | 9ee18b1e08e6a5648aeaaf998eabc72b5304cc17 (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.c | 21 |
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: |