kvm/page_track: call notifiers with kvm_page_track_notifier_node

The user of page_track might needs extra information, so pass
the kvm_page_track_notifier_node to callbacks.
Signed-off-by: Jike Song <jike.song@intel.com>
Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_page_track.h

@@ -29,17 +29,20 @@ struct kvm_page_track_notifier_node {
 	 * @gpa: the physical address written by guest.
 	 * @new: the data was written to the address.
 	 * @bytes: the written length.
+	 * @node: this node
 	 */
 	void (*track_write)(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
-			    int bytes);
+			    int bytes, struct kvm_page_track_notifier_node *node);
 	/*
 	 * It is called when memory slot is being moved or removed
 	 * users can drop write-protection for the pages in that memory slot
 	 *
 	 * @kvm: the kvm where memory slot being moved or removed
 	 * @slot: the memory slot being moved or removed
+	 * @node: this node
 	 */
-	void (*track_flush_slot)(struct kvm *kvm, struct kvm_memory_slot *slot);
+	void (*track_flush_slot)(struct kvm *kvm, struct kvm_memory_slot *slot,
+			    struct kvm_page_track_notifier_node *node);
 };
 
 void kvm_page_track_init(struct kvm *kvm);

arch/x86/kvm/mmu.c

@@ -4405,7 +4405,8 @@ static u64 *get_written_sptes(struct kvm_mmu_page *sp, gpa_t gpa, int *nspte)
 }
 
 static void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
-			      const u8 *new, int bytes)
+			      const u8 *new, int bytes,
+			      struct kvm_page_track_notifier_node *node)
 {
 	gfn_t gfn = gpa >> PAGE_SHIFT;
 	struct kvm_mmu_page *sp;
@@ -4618,7 +4619,8 @@ void kvm_mmu_setup(struct kvm_vcpu *vcpu)
 }
 
 static void kvm_mmu_invalidate_zap_pages_in_memslot(struct kvm *kvm,
-			struct kvm_memory_slot *slot)
+			struct kvm_memory_slot *slot,
+			struct kvm_page_track_notifier_node *node)
 {
 	kvm_mmu_invalidate_zap_all_pages(kvm);
 }

arch/x86/kvm/page_track.c

@@ -222,7 +222,7 @@ void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
 	idx = srcu_read_lock(&head->track_srcu);
 	hlist_for_each_entry_rcu(n, &head->track_notifier_list, node)
 		if (n->track_write)
-			n->track_write(vcpu, gpa, new, bytes);
+			n->track_write(vcpu, gpa, new, bytes, n);
 	srcu_read_unlock(&head->track_srcu, idx);
 }
 
@@ -247,6 +247,6 @@ void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot)
 	idx = srcu_read_lock(&head->track_srcu);
 	hlist_for_each_entry_rcu(n, &head->track_notifier_list, node)
 		if (n->track_flush_slot)
-			n->track_flush_slot(kvm, slot);
+			n->track_flush_slot(kvm, slot, n);
 	srcu_read_unlock(&head->track_srcu, idx);
 }