[PATCH 2/2] KVM: make guest mode entry to be rcu quiescent state

[Gleb Natapov <gleb@redhat.com>]

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>
---
 include/linux/kvm_host.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 0bc3d37..244413f 100644
--- 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)
-- 
1.7.4.4