MMIO exit statistics can be a very valuable information when looking
at KVM performance.
Expose them through debugfs.
Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
---
arch/arm/kvm/mmu.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index d63e05e..c52c145 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -665,6 +665,10 @@ static int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
switch (run->exit_reason) {
case KVM_EXIT_MMIO:
run->mmio = mmio.mmio;
+ vcpu->stat.mmio_exits++;
+ break;
+ case KVM_EXIT_UNKNOWN:
+ vcpu->stat.kmmio_exits++;
break;
}
@@ -674,7 +678,6 @@ static int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
*/
*vcpu_pc(vcpu) += instr_len;
kvm_adjust_itstate(vcpu);
- vcpu->stat.mmio_exits++;
return run->exit_reason;
}
--
1.7.10.3
