kvm: Add more VM stats

This changeset adds the following stats to KVM:
 * numVMHalfEntries: Number of entries into KVM to finalize pending
   IO operations without executing guest instructions. These typically
   happen as a result of a drain where the guest must finalize some
   operations before the guest state is consistent.
 * numExitSignal: Number of VM exits that have been triggered by a
   signal. These usually happen as a result of the timer that limits
   the time spent in KVM.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/cpu/kvm/base.hh b/src/cpu/kvm/base.hh
index 2e3ee551b..3c299ce4e 100644
--- a/src/cpu/kvm/base.hh
+++ b/src/cpu/kvm/base.hh
@@ -687,6 +687,8 @@ class BaseKvmCPU : public BaseCPU
     /* @{ */
     Stats::Scalar numInsts;
     Stats::Scalar numVMExits;
+    Stats::Scalar numVMHalfEntries;
+    Stats::Scalar numExitSignal;
     Stats::Scalar numMMIO;
     Stats::Scalar numCoalescedMMIO;
     Stats::Scalar numIO;