KVM: VFIO: register kvm_device_ops dynamically

Now that we have a dynamic means to register kvm_device_ops, use that
for the VFIO kvm device, instead of relying on the static table.

This is achieved by a module_init call to register the ops with KVM.

Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Alex Williamson <Alex.Williamson@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

3 files changed, 15 insertions, 12 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 7ef088bec715..d44a2d640551 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1068,7 +1068,6 @@ int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
 
 extern struct kvm_device_ops kvm_mpic_ops;
 extern struct kvm_device_ops kvm_xics_ops;
-extern struct kvm_device_ops kvm_vfio_ops;
 
 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f4e792fedb4f..db57363cc287 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2281,10 +2281,6 @@ static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
 #ifdef CONFIG_KVM_XICS
         [KVM_DEV_TYPE_XICS]             = &kvm_xics_ops,
 #endif
-
-#ifdef CONFIG_KVM_VFIO
-        [KVM_DEV_TYPE_VFIO]             = &kvm_vfio_ops,
-#endif
 };
 
 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index ba1a93f935c7..bb11b36ee8a2 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -246,6 +246,16 @@ static void kvm_vfio_destroy(struct kvm_device *dev)
         kfree(dev); /* alloc by kvm_ioctl_create_device, free by .destroy */
 }
 
+static int kvm_vfio_create(struct kvm_device *dev, u32 type);
+
+static struct kvm_device_ops kvm_vfio_ops = {
+        .name = "kvm-vfio",
+        .create = kvm_vfio_create,
+        .destroy = kvm_vfio_destroy,
+        .set_attr = kvm_vfio_set_attr,
+        .has_attr = kvm_vfio_has_attr,
+};
+
 static int kvm_vfio_create(struct kvm_device *dev, u32 type)
 {
         struct kvm_device *tmp;
@@ -268,10 +278,8 @@ static int kvm_vfio_create(struct kvm_device *dev, u32 type)
         return 0;
 }
 
-struct kvm_device_ops kvm_vfio_ops = {
-        .name = "kvm-vfio",
-        .create = kvm_vfio_create,
-        .destroy = kvm_vfio_destroy,
-        .set_attr = kvm_vfio_set_attr,
-        .has_attr = kvm_vfio_has_attr,
-};
+static int __init kvm_vfio_ops_init(void)
+{
+        return kvm_register_device_ops(&kvm_vfio_ops, KVM_DEV_TYPE_VFIO);
+}
+module_init(kvm_vfio_ops_init);