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

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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: Jike Song <jike.song@intel.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Jike Song 2016-12-01 13:20:07 +08:00 committed by Alex Williamson
parent ccd46dbae7
commit 2fc1bec158
1 changed files with 18 additions and 0 deletions
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18
virt/kvm/vfio.c
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@ -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);