KVM: make guest mode entry to be rcu quiescent state

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.

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

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 0bc3d37..b9c3299 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/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)