KVM: PPC: Exit guest context while handling exit

The x86 implementation of KVM accounts for host time while processing
guest exits. Do the same for us.

Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 2c268a1..b4ae11e 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -601,6 +601,7 @@
 	__hard_irq_enable();
 
 	trace_kvm_exit(exit_nr, vcpu);
+	kvm_guest_exit();
 	preempt_enable();
 
 	switch (exit_nr) {
@@ -872,6 +873,7 @@
 		}
 	}
 
+	kvm_guest_enter();
 	trace_kvm_book3s_reenter(r, vcpu);
 
 	return r;