Expand and clean up the page fault stats. The current stats are at best
incomplete, and at worst misleading. Differentiate between faults that
are actually fixed vs those that result in an MMIO SPTE being created,
track faults that are spurious, faults that trigger emulation, faults
that that are fixed in the fast path, and last but not least, track the
number of faults that are taken.
Note, the number of faults that require emulation for write-protected
shadow pages can roughly be calculated by subtracting the number of MMIO
SPTEs created from the overall number of faults that trigger emulation.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20220423034752.
1161007-10-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
struct kvm_vcpu_stat {
struct kvm_vcpu_stat_generic generic;
+ u64 pf_taken;
u64 pf_fixed;
+ u64 pf_emulate;
+ u64 pf_spurious;
+ u64 pf_fast;
+ u64 pf_mmio_spte_created;
u64 pf_guest;
u64 tlb_flush;
u64 invlpg;
*sptep, write_fault, gfn);
if (unlikely(is_noslot_pfn(pfn))) {
+ vcpu->stat.pf_mmio_spte_created++;
mark_mmio_spte(vcpu, sptep, gfn, pte_access);
return RET_PF_EMULATE;
}
return ret;
direct_pte_prefetch(vcpu, it.sptep);
- ++vcpu->stat.pf_fixed;
return ret;
}
trace_fast_page_fault(vcpu, fault, sptep, spte, ret);
walk_shadow_page_lockless_end(vcpu);
+ if (ret != RET_PF_INVALID)
+ vcpu->stat.pf_fast++;
+
return ret;
}
write_unlock(&vcpu->kvm->mmu_lock);
}
-int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
+int noinline kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
void *insn, int insn_len)
{
int r, emulation_type = EMULTYPE_PF;
.req_level = PG_LEVEL_4K,
.goal_level = PG_LEVEL_4K,
};
+ int r;
+
+ /*
+ * Async #PF "faults", a.k.a. prefetch faults, are not faults from the
+ * guest perspective and have already been counted at the time of the
+ * original fault.
+ */
+ if (!prefetch)
+ vcpu->stat.pf_taken++;
if (IS_ENABLED(CONFIG_RETPOLINE) && fault.is_tdp)
- return kvm_tdp_page_fault(vcpu, &fault);
+ r = kvm_tdp_page_fault(vcpu, &fault);
+ else
+ r = vcpu->arch.mmu->page_fault(vcpu, &fault);
- return vcpu->arch.mmu->page_fault(vcpu, &fault);
+ /*
+ * Similar to above, prefetch faults aren't truly spurious, and the
+ * async #PF path doesn't do emulation. Do count faults that are fixed
+ * by the async #PF handler though, otherwise they'll never be counted.
+ */
+ if (r == RET_PF_FIXED)
+ vcpu->stat.pf_fixed++;
+ else if (prefetch)
+ ;
+ else if (r == RET_PF_EMULATE)
+ vcpu->stat.pf_emulate++;
+ else if (r == RET_PF_SPURIOUS)
+ vcpu->stat.pf_spurious++;
+ return r;
}
int kvm_mmu_max_mapping_level(struct kvm *kvm,
return ret;
FNAME(pte_prefetch)(vcpu, gw, it.sptep);
- ++vcpu->stat.pf_fixed;
return ret;
out_gpte_changed:
/* If a MMIO SPTE is installed, the MMIO will need to be emulated. */
if (unlikely(is_mmio_spte(new_spte))) {
+ vcpu->stat.pf_mmio_spte_created++;
trace_mark_mmio_spte(rcu_dereference(iter->sptep), iter->gfn,
new_spte);
ret = RET_PF_EMULATE;
rcu_dereference(iter->sptep));
}
- /*
- * Increase pf_fixed in both RET_PF_EMULATE and RET_PF_FIXED to be
- * consistent with legacy MMU behavior.
- */
- if (ret != RET_PF_SPURIOUS)
- vcpu->stat.pf_fixed++;
-
return ret;
}
const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
+ STATS_DESC_COUNTER(VCPU, pf_taken),
STATS_DESC_COUNTER(VCPU, pf_fixed),
+ STATS_DESC_COUNTER(VCPU, pf_emulate),
+ STATS_DESC_COUNTER(VCPU, pf_spurious),
+ STATS_DESC_COUNTER(VCPU, pf_fast),
+ STATS_DESC_COUNTER(VCPU, pf_mmio_spte_created),
STATS_DESC_COUNTER(VCPU, pf_guest),
STATS_DESC_COUNTER(VCPU, tlb_flush),
STATS_DESC_COUNTER(VCPU, invlpg),