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Commit 2aab2c5b authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
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KVM: call cache_all_regs() only once during instruction emulation 



Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 0004c7c2

arch/x86/kvm/x86.c

+6 −8
Original line number Diff line number Diff line
@@ -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;