KVM: MMU: add tracepoint for kvm_mmu_invalidate_all_pages

It is good for debug and development

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

2 files changed, 21 insertions, 0 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c8063b9b30ee..3fd060af5394 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4264,6 +4264,7 @@ restart:
 void kvm_mmu_invalidate_zap_all_pages(struct kvm *kvm)
 {
         spin_lock(&kvm->mmu_lock);
+        trace_kvm_mmu_invalidate_zap_all_pages(kvm);
         kvm->arch.mmu_valid_gen++;
 
         kvm_zap_obsolete_pages(kvm);
diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
index 697f46664990..eb444dd374af 100644
--- a/arch/x86/kvm/mmutrace.h
+++ b/arch/x86/kvm/mmutrace.h
@@ -276,6 +276,26 @@ TRACE_EVENT(
                   __spte_satisfied(old_spte), __spte_satisfied(new_spte)
         )
 );
+
+TRACE_EVENT(
+        kvm_mmu_invalidate_zap_all_pages,
+        TP_PROTO(struct kvm *kvm),
+        TP_ARGS(kvm),
+
+        TP_STRUCT__entry(
+                __field(unsigned long, mmu_valid_gen)
+                __field(unsigned int, mmu_used_pages)
+        ),
+
+        TP_fast_assign(
+                __entry->mmu_valid_gen = kvm->arch.mmu_valid_gen;
+                __entry->mmu_used_pages = kvm->arch.n_used_mmu_pages;
+        ),
+
+        TP_printk("kvm-mmu-valid-gen %lx used_pages %x",
+                  __entry->mmu_valid_gen, __entry->mmu_used_pages
+        )
+);
 #endif /* _TRACE_KVMMMU_H */
 
 #undef TRACE_INCLUDE_PATH