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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>
This commit is contained in:
Gleb Natapov 2011-04-12 12:36:25 +03:00 committed by Avi Kivity
parent 0004c7c257
commit 2aab2c5b2b
1 changed files with 6 additions and 8 deletions
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14
arch/x86/kvm/x86.c
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@ -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;