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authorJike Song <jike.song@intel.com>2016-12-01 06:20:07 +0100
committerAlex Williamson <alex.williamson@redhat.com>2016-12-01 18:42:17 +0100
commit2fc1bec15883537cf8b35fd628cca33ca25736a5 (patch)
tree21d4b73901fe4662c38ce85b0f5285a2e09bdad7 /virt
parentvfio: support notifier chain in vfio_group (diff)
downloadlinux-2fc1bec15883537cf8b35fd628cca33ca25736a5.tar.xz
linux-2fc1bec15883537cf8b35fd628cca33ca25736a5.zip
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: Jike Song <jike.song@intel.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/vfio.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index 1dd087da6f31..d32f239eb471 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -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);