commit 8317c298eab14cc20e2de5289743ff0d4c5a6b30
author Gleb Natapov <gleb@redhat.com> Sun Apr 12 13:37:02 2009 +0300
committer Avi Kivity <avi@redhat.com> Wed Jun 10 11:48:42 2009 +0300
tree 54f1cea27bd5f8cf55bc268f6236931c4bb458c6
parent ba8afb6b0a2c7e06da760ffe5d078245058619b5

KVM: SVM: Skip instruction on a task switch only when appropriate

If a task switch was initiated because off a task gate in IDT and IDT
was accessed because of an external even the instruction should not
be skipped.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/svm.c

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index bba67b7..8fc6eea 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1828,6 +1828,7 @@
 	int reason;
 	int int_type = svm->vmcb->control.exit_int_info &
 		SVM_EXITINTINFO_TYPE_MASK;
+	int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
 
 	tss_selector = (u16)svm->vmcb->control.exit_info_1;
 
@@ -1843,8 +1844,14 @@
 		reason = TASK_SWITCH_CALL;
 
 
-	if (reason != TASK_SWITCH_GATE || int_type == SVM_EXITINTINFO_TYPE_SOFT)
-		skip_emulated_instruction(&svm->vcpu);
+	if (reason != TASK_SWITCH_GATE ||
+	    int_type == SVM_EXITINTINFO_TYPE_SOFT ||
+	    (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
+	     (int_vec == OF_VECTOR || int_vec == BP_VECTOR))) {
+		if (emulate_instruction(&svm->vcpu, kvm_run, 0, 0,
+					EMULTYPE_SKIP) != EMULATE_DONE)
+			return 0;
+	}
 
 	return kvm_task_switch(&svm->vcpu, tss_selector, reason);
 }