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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/44x_emulate.c
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/44x_emulate.c')
-rw-r--r--arch/powerpc/kvm/44x_emulate.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/44x_emulate.c b/arch/powerpc/kvm/44x_emulate.c
index 9ef79c78ede..69f88d53c42 100644
--- a/arch/powerpc/kvm/44x_emulate.c
+++ b/arch/powerpc/kvm/44x_emulate.c
@@ -22,6 +22,7 @@
#include <asm/dcr-regs.h>
#include <asm/disassemble.h>
#include <asm/kvm_44x.h>
+#include "timing.h"
#include "booke.h"
#include "44x_tlb.h"
@@ -58,11 +59,11 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
int ws;
switch (get_op(inst)) {
-
case OP_RFI:
switch (get_xop(inst)) {
case XOP_RFI:
kvmppc_emul_rfi(vcpu);
+ kvmppc_set_exit_type(vcpu, EMULATED_RFI_EXITS);
*advance = 0;
break;
@@ -78,10 +79,12 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
case XOP_MFMSR:
rt = get_rt(inst);
vcpu->arch.gpr[rt] = vcpu->arch.msr;
+ kvmppc_set_exit_type(vcpu, EMULATED_MFMSR_EXITS);
break;
case XOP_MTMSR:
rs = get_rs(inst);
+ kvmppc_set_exit_type(vcpu, EMULATED_MTMSR_EXITS);
kvmppc_set_msr(vcpu, vcpu->arch.gpr[rs]);
break;
@@ -89,11 +92,13 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
rs = get_rs(inst);
vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
| (vcpu->arch.gpr[rs] & MSR_EE);
+ kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
break;
case XOP_WRTEEI:
vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
| (inst & MSR_EE);
+ kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
break;
case XOP_MFDCR:
@@ -127,6 +132,7 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
run->dcr.is_write = 0;
vcpu->arch.io_gpr = rt;
vcpu->arch.dcr_needed = 1;
+ account_exit(vcpu, DCR_EXITS);
emulated = EMULATE_DO_DCR;
}
@@ -146,6 +152,7 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
run->dcr.data = vcpu->arch.gpr[rs];
run->dcr.is_write = 1;
vcpu->arch.dcr_needed = 1;
+ account_exit(vcpu, DCR_EXITS);
emulated = EMULATE_DO_DCR;
}
@@ -276,6 +283,7 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
return EMULATE_FAIL;
}
+ kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);
return EMULATE_DONE;
}
@@ -357,6 +365,7 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
return EMULATE_FAIL;
}
+ kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS);
return EMULATE_DONE;
}