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

2 files changed, 14 insertions, 22 deletions

diff --git a/scripts/create_mdev.sh b/scripts/create_mdev.sh
index f6c76ed..a6ea91e 100755
--- a/scripts/create_mdev.sh
+++ b/scripts/create_mdev.sh
@@ -5,10 +5,10 @@
 set -euo pipefail
 
 PCI_ADDR="${1:-}"
-VGPU_TYPE="${2:-nvidia-vgpu-turing}"
+VGPU_TYPE="${2:-pci-nvidia-vgpu-turing}"
 
-# Supported vGPU types
-VALID_TYPES=("nvidia-vgpu-ampere" "nvidia-vgpu-hopper" "nvidia-vgpu-turing" "nvidia-vgpu-pascal")
+# Supported vGPU types (matching the mdev type names)
+VALID_TYPES=("pci-nvidia-vgpu-ampere" "pci-nvidia-vgpu-hopper" "pci-nvidia-vgpu-turing" "pci-nvidia-vgpu-pascal")
 
 # Find NVIDIA GPU if not specified
 if [[ -z "$PCI_ADDR" ]]; then
diff --git a/scripts/load_vgpu_stack.sh b/scripts/load_vgpu_stack.sh
index 36211bc..5e7d6fd 100755
--- a/scripts/load_vgpu_stack.sh
+++ b/scripts/load_vgpu_stack.sh
@@ -9,32 +9,23 @@ FIRMWARE_NAME="${1:-gsp-570.144.fwimage.bin}"
 BASE_DIR="$OPEN_IOV_ROOT"
 NVIDIA_KO="$BASE_DIR/nvidia-open-gpu-kernel-modules/kernel-open/nvidia.ko"
 VFIO_KO="$BASE_DIR/kernel/open-iov-vfio.ko"
-GSP_VGPU_KO="$BASE_DIR/driver/gsp-vgpu.ko"
-FIRMWARE_PATH="$BASE_DIR/firmware/570-GSP/$FIRMWARE_NAME"
+FIRMWARE_PATH="$BASE_DIR/firmware/57X-GSP/570.144/$FIRMWARE_NAME"
 
 echo "=========================================="
-echo "Loading vGPU Driver Stack"
+echo "Loading vGPU Driver Stack (Refactored: Host-only GSP Emulation)"
 echo "=========================================="
 echo "Firmware: $FIRMWARE_NAME"
 echo ""
 
 # Check files exist
-for f in "$NVIDIA_KO" "$VFIO_KO" "$GSP_VGPU_KO" "$FIRMWARE_PATH"; do
+for f in "$NVIDIA_KO" "$VFIO_KO" "$FIRMWARE_PATH"; do
     if [[ ! -f "$f" ]]; then
         echo "ERROR: Missing file: $f"
         exit 1
     fi
 done
 
-# Check if already loaded
-if lsmod | grep -q "^nvidia "; then
-    echo "nvidia.ko already loaded"
-else
-    echo "Loading nvidia.ko (OpenRM)..."
-    sudo insmod "$NVIDIA_KO"
-    echo "  OK"
-fi
-
+# Load open-iov-vfio.ko FIRST (provides symbols nvidia.ko needs)
 if lsmod | grep -q "^open_iov_vfio "; then
     echo "open-iov-vfio.ko already loaded"
 else
@@ -43,11 +34,12 @@ else
     echo "  OK"
 fi
 
-if lsmod | grep -q "^gsp_vgpu "; then
-    echo "gsp-vgpu.ko already loaded"
+# Check if already loaded
+if lsmod | grep -q "^nvidia "; then
+    echo "nvidia.ko already loaded"
 else
-    echo "Loading gsp-vgpu.ko with firmware=$FIRMWARE_NAME..."
-    sudo insmod "$GSP_VGPU_KO" firmware_name="$FIRMWARE_NAME"
+    echo "Loading nvidia.ko (OpenRM)..."
+    sudo insmod "$NVIDIA_KO"
     echo "  OK"
 fi
 
@@ -55,10 +47,10 @@ echo ""
 echo "=========================================="
 echo "Driver Stack Loaded Successfully"
 echo "=========================================="
-lsmod | grep -E "nvidia|open_iov|gsp_vgpu"
+lsmod | grep -E "nvidia|open_iov"
 echo ""
 echo "Device nodes:"
-ls -la /dev/gsp-vgpu* /dev/nvidia* 2>/dev/null || echo "  (none yet - create mdev first)"
+ls -la /dev/nvidia* 2>/dev/null || echo "  (none yet - create mdev first)"
 echo ""
 echo "Next steps:"
 echo "  1. Create mdev: $BASE_DIR/scripts/create_mdev.sh"