KVM: Add statistic for remote tlb flushes

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 7939b5c9a4b4..aec6b67cfebb 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -115,6 +115,9 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
                 if (cpu != -1 && cpu != raw_smp_processor_id())
                         cpu_set(cpu, cpus);
         }
+        if (cpus_empty(cpus))
+                return;
+        ++kvm->stat.remote_tlb_flush;
         smp_call_function_mask(cpus, ack_flush, NULL, 1);
 }