Phase 5: Fix MDEV creation blocker - mdev parent registration & ioctl-based vGPU type registration

- Implemented nv_vgpu_mdev_register_parent() using mdev_register_parent() API
  with nv_vgpu_mdev_types array for proper mdev parent registration
- Added ioctl NV_VGPU_IOCTL_REGISTER_VGPU_TYPE for userspace vGPU type registration
- Created separate header nv-vgpu-vfio-interface-nvidia.h for nvidia.ko
  with only extern declarations to avoid duplicate symbol exports
- Used KBUILD_EXTRA_SYMBOLS to provide only needed symbols (nvidia_vgpu_vfio_*)
- Updated create_mdev.sh to use correct mdev type names (pci-nvidia-vgpu-*)
- Updated load_vgpu_stack.sh to load open-iov-vfio.ko before nvidia.ko

Result: 4 mdev types now show available_instances=8, mdev creation successful

1 files changed, 44 insertions, 0 deletions

diff --git a/kernel/ioctl.c b/kernel/ioctl.c
index 571b209..387a249 100644
--- a/kernel/ioctl.c
+++ b/kernel/ioctl.c
@@ -10,6 +10,12 @@
 #include "irq.h"
 #include "migration.h"
 
+/* Forward declarations from main.c */
+extern int nv_vgpu_register_type_info(struct nv_vgpu_type_info *info);
+extern int nv_vgpu_create_mdev_types(void);
+extern void nv_vgpu_free_type_info(void);
+extern struct mdev_driver nv_vgpu_mdev_driver;
+
 int nv_vgpu_ioctl_get_info(struct nv_vgpu_device *vgpu, void __user *arg)
 {
 	struct nv_vgpu_ioctl_get_info info;
@@ -260,4 +266,42 @@ int nv_vgpu_ioctl_migrate_restore(struct nv_vgpu_device *vgpu, void __user *arg)
 		return -EFAULT;
 
 	return ret;
+}
+
+int nv_vgpu_ioctl_register_vgpu_type(void __user *arg)
+{
+	struct nv_vgpu_ioctl_register_vgpu_type params;
+	struct nv_vgpu_type_info info;
+	int ret;
+
+	if (copy_from_user(&params, arg, sizeof(params)))
+		return -EFAULT;
+
+	memset(&info, 0, sizeof(info));
+	strncpy(info.name, params.name, sizeof(info.name) - 1);
+	strncpy(info.description, params.description, sizeof(info.description) - 1);
+	info.vdev_id = params.vdev_id;
+	info.pdev_id = params.pdev_id;
+	info.max_instances = params.max_instances;
+
+	ret = nv_vgpu_register_type_info(&info);
+	if (ret)
+		return ret;
+
+	/* Re-create mdev types with updated info */
+	nv_vgpu_free_type_info();
+	ret = nv_vgpu_create_mdev_types();
+	if (ret)
+		return ret;
+
+	/* Re-register mdev driver with new types */
+	mdev_unregister_driver(&nv_vgpu_mdev_driver);
+	ret = mdev_register_driver(&nv_vgpu_mdev_driver);
+	if (ret) {
+		pr_err("Failed to re-register mdev driver: %d\n", ret);
+		return ret;
+	}
+
+	pr_info("vGPU type '%s' registered via ioctl\n", info.name);
+	return 0;
 }
\ No newline at end of file