VFIO device registration fix + IOMMUFD callbacks + VFIO ioctl handlers

- Removed IOMMU group addition before vfio_register_emulated_iommu_dev() in nv_vgpu_mdev_create()
- Added IOMMUFD callbacks (bind_iommufd, unbind_iommufd, attach_ioas, detach_ioas) using kernel's vfio_iommufd_emulated_* functions
- Implemented VFIO ioctl handlers: GET_INFO, GET_REGION_INFO, GET_IRQ_INFO, SET_IRQS, MMAP
- Added config space read/write handlers at offset 0x70000000000
- Mmap handler for config space, BAR0 (emulation shadow), BAR1-5 (physical VRAM/registers)
- Interrupt handler for VFIO_DEVICE_SET_IRQS (DATA_EVENTFD, DATA_NONE, DATA_BOOL)
- Added udev rules for vfio group permissions
- Created stack_manager.sh unified tool
- Fixed mdev remove crash with deferred cleanup in vfio_device_release callback
- Kernel 6.8+ IOMMUFD compatibility
- QEMU launches successfully with vGPU passthrough

1 files changed, 14 insertions, 2 deletions

diff --git a/kernel/include/nvidia-vgpu-vfio.h b/kernel/include/nvidia-vgpu-vfio.h
index 7f778ee..3ca5cf6 100644
--- a/kernel/include/nvidia-vgpu-vfio.h
+++ b/kernel/include/nvidia-vgpu-vfio.h
@@ -90,6 +90,9 @@ struct nv_vgpu_migration_state {
 };
 
 struct nv_vgpu_device {
+	/* VFIO device for VFIO group - must be first for vfio_alloc_device */
+	struct vfio_device vfio_dev;
+	
 	struct mdev_device *mdev;
 	struct pci_dev *pdev;
 	struct device dev;
@@ -123,9 +126,18 @@ struct nv_vgpu_device {
 	bool dry_run;
 
 	/* PCI Config Space for VFIO mdev */
-	u8 pci_config[256];
+	u8 pci_config[4096];
 	bool config_space_dirty;
-};
+
+ 	/* VFIO device open/close tracking */
+ 	atomic_t vfio_dev_open_count;
+ 	wait_queue_head_t vfio_dev_close_wait;
+
+ 	/* VFIO device registration state */
+ 	bool vfio_dev_registered;
+ };
+
+typedef struct nv_vgpu_device nv_vgpu_device;
 
 struct nv_vgpu_driver_data {
 	struct mutex lock;