From: Suresh Warrier <warrier@xxxxxxxxxxxxxxxxxx>
Add VCPU stat counters to track affinity for passthrough
interrupts.
pthru_all: Counts all passthrough interrupts whose IRQ mappings are
in the kvmppc_passthru_irq_map structure.
pthru_host: Counts all cached passthrough interrupts that were injected
from the host through kvm_set_irq (i.e. not handled in
real mode).
pthru_bad_aff: Counts how many cached passthrough interrupts have
bad affinity (receiving CPU is not running VCPU that is
the target of the virtual interrupt in the guest).
Signed-off-by: Suresh Warrier <warrier@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx>
---
arch/powerpc/include/asm/kvm_host.h | 3 +++
arch/powerpc/kvm/book3s.c | 3 +++
arch/powerpc/kvm/book3s_hv_rm_xics.c | 18 +++++++++++++-----
3 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 3eb5092..f371a23 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -131,6 +131,9 @@ struct kvm_vcpu_stat {
u32 ld_slow;
u32 st_slow;
#endif
+ u32 pthru_all;
+ u32 pthru_host;
+ u32 pthru_bad_aff;
};
enum kvm_exit_types {
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 47018fc..6d0c45b 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -64,6 +64,9 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "ld_slow", VCPU_STAT(ld_slow) },
{ "st", VCPU_STAT(st) },
{ "st_slow", VCPU_STAT(st_slow) },
+ { "pthru_all", VCPU_STAT(pthru_all) },
+ { "pthru_host", VCPU_STAT(pthru_host) },
+ { "pthru_bad_aff", VCPU_STAT(pthru_bad_aff) },
{ NULL }
};
diff --git a/arch/powerpc/kvm/book3s_hv_rm_xics.c b/arch/powerpc/kvm/book3s_hv_rm_xics.c
index 5f7527e..82ff5de 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_xics.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_xics.c
@@ -716,11 +716,19 @@ int kvmppc_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
icp->rm_eoied_irq = irq;
}
- if (state->host_irq && state->intr_cpu != -1) {
- int pcpu = cpu_first_thread_sibling(raw_smp_processor_id());
- if (state->intr_cpu != pcpu)
- xics_opal_rm_set_server(state->host_irq, pcpu);
- state->intr_cpu = -1;
+ if (state->host_irq) {
+ ++vcpu->stat.pthru_all;
+ if (state->intr_cpu != -1) {
+ int pcpu = raw_smp_processor_id();
+
+ pcpu = cpu_first_thread_sibling(pcpu);
+ ++vcpu->stat.pthru_host;
+ if (state->intr_cpu != pcpu) {
+ ++vcpu->stat.pthru_bad_aff;
+ xics_opal_rm_set_server(state->host_irq, pcpu);
+ }
+ state->intr_cpu = -1;
+ }
}
bail:
return check_too_hard(xics, icp);
--
2.8.1
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