Commit 1075d41e authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
Browse files

KVM: x86/mmu: Expand and clean up page fault stats 



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: default avatarSean Christopherson <seanjc@google.com>
Message-Id: <20220423034752.1161007-10-seanjc@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 8d5265b1

arch/x86/include/asm/kvm_host.h

+5 −0
Original line number Diff line number Diff line
@@ -1269,7 +1269,12 @@ struct kvm_vm_stat { 


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;

arch/x86/kvm/mmu/mmu.c

+5 −2
Original line number Diff line number Diff line
@@ -2660,6 +2660,7 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot, 
		 *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;

	}
@@ -2980,7 +2981,6 @@ static int __direct_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) 
		return ret;



	direct_pte_prefetch(vcpu, it.sptep);

	++vcpu->stat.pf_fixed;

	return ret;

}
@@ -3249,6 +3249,9 @@ static int fast_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) 
	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;

}
@@ -5354,7 +5357,7 @@ static void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, 
	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;

arch/x86/kvm/mmu/mmu_internal.h

+26 −2
Original line number Diff line number Diff line
@@ -248,11 +248,35 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, 
		.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,

arch/x86/kvm/mmu/paging_tmpl.h

+0 −1
Original line number Diff line number Diff line
@@ -723,7 +723,6 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault, 
		return ret;



	FNAME(pte_prefetch)(vcpu, gw, it.sptep);

	++vcpu->stat.pf_fixed;

	return ret;



out_gpte_changed:

arch/x86/kvm/mmu/tdp_mmu.c

+1 −7
Original line number Diff line number Diff line
@@ -1100,6 +1100,7 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, 


	/* 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;
@@ -1108,13 +1109,6 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, 
				       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;

}