[v4 3/3] kvm: notify vfio on attaching and detaching

[Jike Song <jike.song@intel.com>]

Sometimes vfio needs to be aware when a group attaches to a KVM or
detaches from it. KVM already calls get/put method from vfio to
manipulate the reference, now it can notify vfio in a similar way.

Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Jike Song <jike.song@intel.com>
---
 virt/kvm/vfio.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index 1dd087d..104082b 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -60,6 +60,32 @@ static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group)
 	symbol_put(vfio_group_put_external_user);
 }
 
+static void kvm_vfio_group_attach_kvm(struct vfio_group *group, struct kvm *kvm)
+{
+	void (*fn)(struct vfio_group *, struct kvm *);
+
+	fn = symbol_get(vfio_group_notify);
+	if (!fn)
+		return;
+
+	fn(group, kvm);
+
+	symbol_put(vfio_group_notify);
+}
+
+static void kvm_vfio_group_detach_kvm(struct vfio_group *group, struct kvm *kvm)
+{
+	void (*fn)(struct vfio_group *, struct kvm *);
+
+	fn = symbol_get(vfio_group_notify);
+	if (!fn)
+		return;
+
+	fn(group, NULL);
+
+	symbol_put(vfio_group_notify);
+}
+
 static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)
 {
 	long (*fn)(struct vfio_group *, unsigned long);
@@ -155,6 +181,8 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
 		list_add_tail(&kvg->node, &kv->group_list);
 		kvg->vfio_group = vfio_group;
 
+		kvm_vfio_group_attach_kvm(vfio_group, dev->kvm);
+
 		kvm_arch_start_assignment(dev->kvm);
 
 		mutex_unlock(&kv->lock);
@@ -196,6 +224,8 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
 
 		mutex_unlock(&kv->lock);
 
+		kvm_vfio_group_detach_kvm(vfio_group, dev->kvm);
+
 		kvm_vfio_group_put_external_user(vfio_group);
 
 		kvm_vfio_update_coherency(dev);
@@ -240,6 +270,7 @@ static void kvm_vfio_destroy(struct kvm_device *dev)
 	struct kvm_vfio_group *kvg, *tmp;
 
 	list_for_each_entry_safe(kvg, tmp, &kv->group_list, node) {
+		kvm_vfio_group_detach_kvm(kvg->vfio_group, dev->kvm);
 		kvm_vfio_group_put_external_user(kvg->vfio_group);
 		list_del(&kvg->node);
 		kfree(kvg);
-- 
1.9.1