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, 61 insertions, 0 deletions

diff --git a/scripts/build_nvidia_openrm.sh b/scripts/build_nvidia_openrm.sh
new file mode 100755
index 0000000..dfcbe59
--- /dev/null
+++ b/scripts/build_nvidia_openrm.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+# Build NVIDIA OpenRM kernel modules with Open-IOV vGPU VFIO symbols
+# This script ensures KBUILD_EXTRA_SYMBOLS is correctly passed to the build
+
+set -e
+
+OPEN_IOV_ROOT="$OPEN_IOV_ROOT"
+NVIDIA_OPENRM_DIR="$OPEN_IOV_ROOT/nvidia-open-gpu-kernel-modules"
+KERNEL_DIR="$OPEN_IOV_ROOT/kernel"
+SYMVERS_FILE="$KERNEL_DIR/Module.symvers"
+
+echo "=== Building NVIDIA OpenRM with Open-IOV vGPU VFIO symbols ==="
+echo "Open-IOV root: $OPEN_IOV_ROOT"
+echo "NVIDIA OpenRM dir: $NVIDIA_OPENRM_DIR"
+echo "Kernel Module.symvers: $SYMVERS_FILE"
+
+# Check if open-iov-vfio.ko has been built (provides Module.symvers)
+if [ ! -f "$SYMVERS_FILE" ]; then
+    echo "ERROR: $SYMVERS_FILE not found!"
+    echo "Please build open-iov-vfio.ko first: cd $OPEN_IOV_ROOT && make kernel"
+    exit 1
+fi
+
+echo "Found Module.symvers with $(wc -l < "$SYMVERS_FILE") exported symbols"
+echo "Key vGPU symbols:"
+grep -i vgpu "$SYMVERS_FILE" | head -5
+
+# Build NVIDIA OpenRM kernel modules
+cd "$NVIDIA_OPENRM_DIR/kernel-open"
+
+# Clean previous build to ensure fresh symbol resolution
+echo "Cleaning previous build..."
+make clean
+
+echo "Building NVIDIA OpenRM modules with KBUILD_EXTRA_SYMBOLS..."
+KBUILD_EXTRA_SYMBOLS="$SYMVERS_FILE" make -j$(nproc) modules
+
+# Verify the symbols are resolved
+echo ""
+echo "=== Verification ==="
+echo "Checking nvidia.ko for vGPU VFIO symbols..."
+if modinfo nvidia.ko 2>/dev/null | grep -q "nvidia_vgpu_vfio"; then
+    echo "✓ nvidia.ko has vGPU VFIO symbols"
+else
+    echo "⚠ nvidia.ko may not have vGPU VFIO symbols (check modpost output above)"
+fi
+
+echo ""
+echo "Checking Module.symvers for vGPU symbols..."
+grep -i vgpu Module.symvers | head -5
+
+echo ""
+echo "=== Build Complete ==="
+echo "nvidia.ko location: $NVIDIA_OPENRM_DIR/kernel-open/nvidia.ko"
+echo ""
+echo "To load the stack:"
+echo "  sudo insmod $NVIDIA_OPENRM_DIR/kernel-open/nvidia.ko"
+echo "  sudo insmod $KERNEL_DIR/open-iov-vfio.ko"
+echo "  sudo cp $OPEN_IOV_ROOT/firmware/57X-GSP/570.144/gsp-570.144.fwimage.bin /lib/firmware/"
+echo "  ./scripts/create_mdev.sh"
+echo "  ./scripts/launch_qemu_vgpu.sh"
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