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KVM: VMX: Avoid reading %rip unnecessarily when handling exceptions

Message ID 1303995636-8060-1-git-send-email-avi@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Avi Kivity April 28, 2011, 1 p.m. UTC 
Avoids a VMREAD.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 arch/x86/kvm/vmx.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
diff mbox

Patch

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3f6e9bf..139a5cb 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3170,7 +3170,6 @@  static int handle_exception(struct kvm_vcpu *vcpu)
 	}
 
 	error_code = 0;
-	rip = kvm_rip_read(vcpu);
 	if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
 		error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
 	if (is_page_fault(intr_info)) {
@@ -3217,6 +3216,7 @@  static int handle_exception(struct kvm_vcpu *vcpu)
 		vmx->vcpu.arch.event_exit_inst_len =
 			vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
 		kvm_run->exit_reason = KVM_EXIT_DEBUG;
+		rip = kvm_rip_read(vcpu);
 		kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
 		kvm_run->debug.arch.exception = ex_no;
 		break;