[PATCH v5 7/8] KVM: MMU: add tracepoint for kvm_mmu_invalidate_memslot_pages

[Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>]

It is good for debug and development

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
---
 arch/x86/kvm/mmu.c      |    2 ++
 arch/x86/kvm/mmutrace.h |   23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 268b2ff..e12f431 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4300,6 +4300,8 @@ void kvm_mmu_invalidate_memslot_pages(struct kvm *kvm,
 
 	if (slot)
 		zap_invalid_pages(kvm);
+
+	trace_kvm_mmu_invalidate_memslot_pages(kvm, slot);
 	spin_unlock(&kvm->mmu_lock);
 }
 
diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
index 697f466..8ef3e0e 100644
--- a/arch/x86/kvm/mmutrace.h
+++ b/arch/x86/kvm/mmutrace.h
@@ -276,6 +276,29 @@ TRACE_EVENT(
 		  __spte_satisfied(old_spte), __spte_satisfied(new_spte)
 	)
 );
+
+TRACE_EVENT(
+	kvm_mmu_invalidate_memslot_pages,
+	TP_PROTO(struct kvm *kvm, struct kvm_memory_slot *slot),
+	TP_ARGS(kvm, slot),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, mmu_valid_gen)
+		__field(unsigned int, mmu_used_pages)
+		__field(int, slot_id)
+	),
+
+	TP_fast_assign(
+		__entry->mmu_valid_gen = kvm->arch.mmu_valid_gen;
+		__entry->mmu_used_pages = kvm->arch.n_used_mmu_pages;
+		__entry->slot_id = slot ? slot->id : -1;
+	),
+
+	TP_printk("kvm-mmu-valid-gen %lx slot_id %d used_pages %x",
+		  __entry->mmu_valid_gen, __entry->slot_id,
+		  __entry->mmu_used_pages
+	)
+);
 #endif /* _TRACE_KVMMMU_H */
 
 #undef TRACE_INCLUDE_PATH
-- 
1.7.7.6