From: Joerg Roedel <joerg.roedel@amd.com>
Date: Wed, 9 Apr 2008 14:04:32 +0000 (+0200)
Subject: KVM: SVM: do not intercept task switch with NPT
X-Git-Tag: v2.6.26-rc1~1028^2~21
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3564990af1b9f77a63692c1079e9c41af229f066;p=linux-2.6

KVM: SVM: do not intercept task switch with NPT

When KVM uses NPT there is no reason to intercept task switches. This patch
removes the intercept for it in that case.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index da3ddef476..8d04aed72f 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -591,6 +591,7 @@ static void init_vmcb(struct vcpu_svm *svm)
 	if (npt_enabled) {
 		/* Setup VMCB for Nested Paging */
 		control->nested_ctl = 1;
+		control->intercept &= ~(1ULL << INTERCEPT_TASK_SWITCH);
 		control->intercept_exceptions &= ~(1 << PF_VECTOR);
 		control->intercept_cr_read &= ~(INTERCEPT_CR0_MASK|
 						INTERCEPT_CR3_MASK);