commit 6e5d865c0b9679b00b5e5f0754c9fc2b6b9894d6
author Yang, Sheng <sheng.yang@intel.com> Wed Sep 12 18:03:11 2007 +0800
committer Avi Kivity <avi@qumranet.com> Sat Oct 13 10:18:26 2007 +0200
tree 1b8133926578a16f8849143da5a7d5a6d9e67b24
parent 2a8067f17b8442ecce0b14e134823020ff33b4fa

KVM: VMX: Use shadow TPR/cr8 for 64-bits guests

This patch enables TPR shadow of VMX on CR8 access. 64bit Windows using
CR8 access TPR frequently. The TPR shadow can improve the performance of
access TPR by not causing vmexit.

Signed-off-by: Sheng Yang <sheng.yang@intel.com>
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/vmx.h

diff --git a/drivers/kvm/vmx.h b/drivers/kvm/vmx.h
index 35d0b58..fd4e146 100644
--- a/drivers/kvm/vmx.h
+++ b/drivers/kvm/vmx.h
@@ -213,6 +213,7 @@
 #define EXIT_REASON_MSR_READ            31
 #define EXIT_REASON_MSR_WRITE           32
 #define EXIT_REASON_MWAIT_INSTRUCTION   36
+#define EXIT_REASON_TPR_BELOW_THRESHOLD 43
 
 /*
  * Interruption-information format