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Commit 2fc1bec1 authored by Jike Song's avatar Jike Song Committed by Alex Williamson
Browse files

kvm: set/clear kvm to/from vfio_group when group add/delete 



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

Cc: Kirti Wankhede <kwankhede@nvidia.com>
Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarJike Song <jike.song@intel.com>
Acked-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent ccd46dba

virt/kvm/vfio.c

+18 −0
Original line number Diff line number Diff line
@@ -60,6 +60,19 @@ 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_set_kvm(struct vfio_group *group, struct kvm *kvm)

{

	void (*fn)(struct vfio_group *, struct kvm *);



	fn = symbol_get(vfio_group_set_kvm);

	if (!fn)

		return;



	fn(group, kvm);



	symbol_put(vfio_group_set_kvm);

}



static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)

{

	long (*fn)(struct vfio_group *, unsigned long);
@@ -159,6 +172,8 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg) 


		mutex_unlock(&kv->lock);



		kvm_vfio_group_set_kvm(vfio_group, dev->kvm);



		kvm_vfio_update_coherency(dev);



		return 0;
@@ -196,6 +211,8 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg) 


		mutex_unlock(&kv->lock);



		kvm_vfio_group_set_kvm(vfio_group, NULL);



		kvm_vfio_group_put_external_user(vfio_group);



		kvm_vfio_update_coherency(dev);
@@ -240,6 +257,7 @@ 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_set_kvm(kvg->vfio_group, NULL);

		kvm_vfio_group_put_external_user(kvg->vfio_group);

		list_del(&kvg->node);

		kfree(kvg);