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authorHollis Blanchard <hollisb@us.ibm.com>2008-12-02 15:51:57 -0600
committerAvi Kivity <avi@redhat.com>2008-12-31 16:55:41 +0200
commit73e75b416ffcfa3a84952d8e389a0eca080f00e1 (patch)
tree6195be5b0fa56235550679f35ca990093dd081ca /arch/powerpc/kvm/booke.h
parentc5fbdffbda79254047ec83b09c1a61a3655d052a (diff)
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>
Diffstat (limited to 'arch/powerpc/kvm/booke.h')
-rw-r--r--arch/powerpc/kvm/booke.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/booke.h b/arch/powerpc/kvm/booke.h
index 48d905fd60a..cf7c94ca24b 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 @@ static inline void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
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__ */