KVM: ppc: Implement in-kernel exit timing statistics
Existing KVM statistics are either just counters (kvm_stat) reported for
KVM generally or trace based aproaches like kvm_trace.
For KVM on powerpc we had the need to track the timings of the different exit
types. While this could be achieved parsing data created with a kvm_trace
extension this adds too much overhead (at least on embedded PowerPC) slowing
down the workloads we wanted to measure.
Therefore this patch adds a in-kernel exit timing statistic to the powerpc kvm
code. These statistic is available per vm&vcpu under the kvm debugfs directory.
As this statistic is low, but still some overhead it can be enabled via a
.config entry and should be off by default.
Since this patch touched all powerpc kvm_stat code anyway this code is now
merged and simplified together with the exit timing statistic code (still
working with exit timing disabled in .config).
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/powerpc/kvm/booke.h b/arch/powerpc/kvm/booke.h
index 48d905f..cf7c94c 100644
--- a/arch/powerpc/kvm/booke.h
+++ b/arch/powerpc/kvm/booke.h
@@ -22,6 +22,7 @@
#include <linux/types.h>
#include <linux/kvm_host.h>
+#include "timing.h"
/* interrupt priortity ordering */
#define BOOKE_IRQPRIO_DATA_STORAGE 0
@@ -50,8 +51,10 @@
vcpu->arch.msr = new_msr;
- if (vcpu->arch.msr & MSR_WE)
+ if (vcpu->arch.msr & MSR_WE) {
kvm_vcpu_block(vcpu);
+ kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
+ };
}
#endif /* __KVM_BOOKE_H__ */