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yaml --- r: 248108 b: refs/heads/master c: 8fa2206 h: refs/heads/master v: v3
git-mirror · May 22, 2011 · 7508095 · 7508095
1 parent 71e2498
commit 7508095
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Showing 2 changed files with 10 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e3aa52d665ec1a962d1cf025a2e5ee84b3b33406
+refs/heads/master: 8fa2206821953a50a3a02ea33fcfb3ced2fd9997
diff --git a/trunk/include/linux/kvm_host.h b/trunk/include/linux/kvm_host.h
@@ -591,8 +591,17 @@ static inline int kvm_deassign_device(struct kvm *kvm,
 
 static inline void kvm_guest_enter(void)
 {
+	BUG_ON(preemptible());
 	account_system_vtime(current);
 	current->flags |= PF_VCPU;
+	/* KVM does not hold any references to rcu protected data when it
+	 * switches CPU into a guest mode. In fact switching to a guest mode
+	 * is very similar to exiting to userspase from rcu point of view. In
+	 * addition CPU may stay in a guest mode for quite a long time (up to
+	 * one time slice). Lets treat guest mode as quiescent state, just like
+	 * we do with user-mode execution.
+	 */
+	rcu_virt_note_context_switch(smp_processor_id());
 }
 
 static inline void kvm_guest_exit(void)