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, 2 insertions, 0 deletions

diff --git a/kernel/gsp_emulation.h b/kernel/gsp_emulation.h
index f703ae6..12bce63 100644
--- a/kernel/gsp_emulation.h
+++ b/kernel/gsp_emulation.h
@@ -41,6 +41,7 @@
 struct gsp_emu_context {
     struct nv_vgpu_device *vgpu;
     struct task_struct *thread;
+    struct completion thread_stopped;
     void __iomem *bar0_vaddr;
     void __iomem *doorbell_reg;
     void __iomem *shared_mem;
@@ -48,6 +49,7 @@ struct gsp_emu_context {
     spinlock_t lock;
     bool running;
     bool initialized;
+    bool stopping;
 
     /* Shared memory for RPC communication (4KB at BAR0+0x1000) */
     void *shared_mem_virt;