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| author | Gleb Natapov <gleb@redhat.com> | 2011-04-12 13:36:25 +0400 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-05-22 16:39:54 +0400 |
| commit | 2aab2c5b2bac6510b3bd143ca83babee382f4302 (patch) | |
| tree | 5b2cd8e63335f0b4c09f9106a58286febeb229b1 | |
| parent | 0004c7c25757f103ddb3a9e4bcfd533aad41f9a0 (diff) | |
| download | linux-2aab2c5b2bac6510b3bd143ca83babee382f4302.tar.xz | |
KVM: call cache_all_regs() only once during instruction emulation
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
| -rw-r--r-- | arch/x86/kvm/x86.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index a9a307a75465..f5f2d3d44577 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4459,6 +4459,12 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu) struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode; int cs_db, cs_l; + /* + * TODO: fix emulate.c to use guest_read/write_register + * instead of direct ->regs accesses, can save hundred cycles + * on Intel for instructions that don't read/change RSP, for + * for example. + */ cache_all_regs(vcpu); kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); @@ -4562,14 +4568,6 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, kvm_clear_exception_queue(vcpu); - /* - * TODO: fix emulate.c to use guest_read/write_register - * instead of direct ->regs accesses, can save hundred cycles - * on Intel for instructions that don't read/change RSP, for - * for example. - */ - cache_all_regs(vcpu); - if (!(emulation_type & EMULTYPE_NO_DECODE)) { init_emulate_ctxt(vcpu); vcpu->arch.emulate_ctxt.interruptibility = 0; |