KVM: MMU: trace mmio page fault

Add tracepoints to trace mmio page fault

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/mmu.c

@@ -211,6 +211,7 @@ static void mark_mmio_spte(u64 *sptep, u64 gfn, unsigned access)
 {
 	access &= ACC_WRITE_MASK | ACC_USER_MASK;
 
+	trace_mark_mmio_spte(sptep, gfn, access);
 	mmu_spte_set(sptep, shadow_mmio_mask | access | gfn << PAGE_SHIFT);
 }
 
@@ -1940,6 +1941,8 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
 		kvm_mmu_isolate_pages(invalid_list);
 		sp = list_first_entry(invalid_list, struct kvm_mmu_page, link);
 		list_del_init(invalid_list);
+
+		trace_kvm_mmu_delay_free_pages(sp);
 		call_rcu(&sp->rcu, free_pages_rcu);
 		return;
 	}
@@ -2938,6 +2941,8 @@ int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct)
 
 		if (direct)
 			addr = 0;
+
+		trace_handle_mmio_page_fault(addr, gfn, access);
 		vcpu_cache_mmio_info(vcpu, addr, gfn, access);
 		return 1;
 	}

arch/x86/kvm/mmutrace.h

@@ -196,6 +196,54 @@ DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_prepare_zap_page,
 	TP_ARGS(sp)
 );
 
+DEFINE_EVENT(kvm_mmu_page_class, kvm_mmu_delay_free_pages,
+	TP_PROTO(struct kvm_mmu_page *sp),
+
+	TP_ARGS(sp)
+);
+
+TRACE_EVENT(
+	mark_mmio_spte,
+	TP_PROTO(u64 *sptep, gfn_t gfn, unsigned access),
+	TP_ARGS(sptep, gfn, access),
+
+	TP_STRUCT__entry(
+		__field(void *, sptep)
+		__field(gfn_t, gfn)
+		__field(unsigned, access)
+	),
+
+	TP_fast_assign(
+		__entry->sptep = sptep;
+		__entry->gfn = gfn;
+		__entry->access = access;
+	),
+
+	TP_printk("sptep:%p gfn %llx access %x", __entry->sptep, __entry->gfn,
+		  __entry->access)
+);
+
+TRACE_EVENT(
+	handle_mmio_page_fault,
+	TP_PROTO(u64 addr, gfn_t gfn, unsigned access),
+	TP_ARGS(addr, gfn, access),
+
+	TP_STRUCT__entry(
+		__field(u64, addr)
+		__field(gfn_t, gfn)
+		__field(unsigned, access)
+	),
+
+	TP_fast_assign(
+		__entry->addr = addr;
+		__entry->gfn = gfn;
+		__entry->access = access;
+	),
+
+	TP_printk("addr:%llx gfn %llx access %x", __entry->addr, __entry->gfn,
+		  __entry->access)
+);
+
 TRACE_EVENT(
 	kvm_mmu_audit,
 	TP_PROTO(struct kvm_vcpu *vcpu, int audit_point),

arch/x86/kvm/trace.h

@@ -698,6 +698,29 @@ TRACE_EVENT(kvm_emulate_insn,
 #define trace_kvm_emulate_insn_start(vcpu) trace_kvm_emulate_insn(vcpu, 0)
 #define trace_kvm_emulate_insn_failed(vcpu) trace_kvm_emulate_insn(vcpu, 1)
 
+TRACE_EVENT(
+	vcpu_match_mmio,
+	TP_PROTO(gva_t gva, gpa_t gpa, bool write, bool gpa_match),
+	TP_ARGS(gva, gpa, write, gpa_match),
+
+	TP_STRUCT__entry(
+		__field(gva_t, gva)
+		__field(gpa_t, gpa)
+		__field(bool, write)
+		__field(bool, gpa_match)
+		),
+
+	TP_fast_assign(
+		__entry->gva = gva;
+		__entry->gpa = gpa;
+		__entry->write = write;
+		__entry->gpa_match = gpa_match
+		),
+
+	TP_printk("gva %#lx gpa %#llx %s %s", __entry->gva, __entry->gpa,
+		  __entry->write ? "Write" : "Read",
+		  __entry->gpa_match ? "GPA" : "GVA")
+);
 #endif /* _TRACE_KVM_H */
 
 #undef TRACE_INCLUDE_PATH

arch/x86/kvm/x86.c

@@ -4021,6 +4021,7 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
 		  vcpu->arch.access)) {
 		*gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
 					(gva & (PAGE_SIZE - 1));
+		trace_vcpu_match_mmio(gva, *gpa, write, false);
 		return 1;
 	}
 
@@ -4036,8 +4037,10 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
 	if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
 		return 1;
 
-	if (vcpu_match_mmio_gpa(vcpu, *gpa))
+	if (vcpu_match_mmio_gpa(vcpu, *gpa)) {
+		trace_vcpu_match_mmio(gva, *gpa, write, true);
 		return 1;
+	}
 
 	return 0;
 }