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#!/bin/bash
# create_mdev.sh - Create NVIDIA vGPU mediated device for QEMU
# Usage: ./create_mdev.sh [PCI_ADDRESS] [VGPU_TYPE]
set -euo pipefail
PCI_ADDR="${1:-}"
VGPU_TYPE="${2:-pci-nvidia-vgpu-turing}"
# 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
echo "Scanning for NVIDIA GPUs..."
mapfile -t GPUS < <(lspci -D -d 10de: | grep -E "VGA|3D controller" | awk '{print $1}')
if [[ ${#GPUS[@]} -eq 0 ]]; then
echo "ERROR: No NVIDIA GPU found"
exit 1
elif [[ ${#GPUS[@]} -eq 1 ]]; then
PCI_ADDR="${GPUS[0]}"
echo "Auto-selected GPU: $PCI_ADDR"
else
echo "Multiple GPUs found:"
for i in "${!GPUS[@]}"; do
echo " [$i] ${GPUS[$i]}"
done
read -p "Select GPU [0-$((${#GPUS[@]}-1))]: " idx
PCI_ADDR="${GPUS[$idx]}"
fi
fi
# Validate PCI address format
if [[ ! "$PCI_ADDR" =~ ^[0-9a-fA-F]{4}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}\.[0-9a-fA-F]$ ]]; then
echo "ERROR: Invalid PCI address format. Expected: dddd:bb:dd.f"
exit 1
fi
# Check if GPU exists
if [[ ! -e "/sys/bus/pci/devices/$PCI_ADDR" ]]; then
echo "ERROR: PCI device $PCI_ADDR not found"
exit 1
fi
# Validate vGPU type
if [[ ! " ${VALID_TYPES[*]} " =~ " ${VGPU_TYPE} " ]]; then
echo "ERROR: Invalid vGPU type. Valid types: ${VALID_TYPES[*]}"
exit 1
fi
MDEV_TYPE_PATH="/sys/bus/pci/devices/$PCI_ADDR/mdev_supported_types/$VGPU_TYPE"
if [[ ! -d "$MDEV_TYPE_PATH" ]]; then
echo "ERROR: vGPU type $VGPU_TYPE not supported on $PCI_ADDR"
echo "Available types:"
ls "/sys/bus/pci/devices/$PCI_ADDR/mdev_supported_types/" 2>/dev/null || echo " (none - check driver loaded)"
exit 1
fi
# Check available instances
AVAILABLE=$(cat "$MDEV_TYPE_PATH/available_instances" 2>/dev/null || echo "0")
if [[ "$AVAILABLE" -le 0 ]]; then
echo "ERROR: No available instances for $VGPU_TYPE on $PCI_ADDR"
exit 1
fi
echo "Creating $VGPU_TYPE on $PCI_ADDR..."
# Generate UUID
UUID=$(uuidgen)
echo "$UUID" | sudo tee "$MDEV_TYPE_PATH/create" > /dev/null
# Verify creation
MDEV_PATH="/sys/bus/mdev/devices/$UUID"
if [[ -d "$MDEV_PATH" ]]; then
echo "SUCCESS: Created mdev device $UUID"
echo " Path: $MDEV_PATH"
echo " PCI: $PCI_ADDR"
echo " Type: $VGPU_TYPE"
echo ""
echo "For QEMU, use:"
echo " -device vfio-pci,sysfsdev=$MDEV_PATH,display=off"
else
echo "ERROR: Failed to create mdev device"
exit 1
fi
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