context_tracking: move rcu_virt_note_context_switch out of kvm_host.h

Make kvm_guest_{enter,exit} and __kvm_guest_{enter,exit} trivial wrappers
around the code in context_tracking.h.  Name the context_tracking.h functions
consistently with what those for kernel<->user switch.

Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 4 insertions, 21 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 0640ee92b978..ffff40522688 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -878,40 +878,23 @@ static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
 /* must be called with irqs disabled */
 static inline void __kvm_guest_enter(void)
 {
-	guest_enter();
-	/* 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 userspace 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.
-	 */
-	if (!context_tracking_cpu_is_enabled())
-		rcu_virt_note_context_switch(smp_processor_id());
+	guest_enter_irqoff();
 }
 
 /* must be called with irqs disabled */
 static inline void __kvm_guest_exit(void)
 {
-	guest_exit();
+	guest_exit_irqoff();
 }
 
 static inline void kvm_guest_enter(void)
 {
-	unsigned long flags;
-
-	local_irq_save(flags);
-	__kvm_guest_enter();
-	local_irq_restore(flags);
+	guest_enter();
 }
 
 static inline void kvm_guest_exit(void)
 {
-	unsigned long flags;
-
-	local_irq_save(flags);
-	__kvm_guest_exit();
-	local_irq_restore(flags);
+	guest_exit();
 }
 
 /*