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|
#!/bin/bash
# launch_qemu_vgpu.sh - Launch QEMU with NVIDIA vGPU mediated device
# Usage: ./launch_qemu_vgpu.sh [install|run] [MDEV_UUID] [GUEST_IMAGE] [OPTIONS]
set -euo pipefail
MODE="${1:-run}"
if [[ "$MODE" == "install" ]]; then
shift
elif [[ "$MODE" == "run" ]]; then
shift
else
# Default to run if first arg doesn't match
MODE="run"
fi
MDEV_UUID="${1:-}"
GUEST_IMAGE="${2:-/var/lib/libvirt/images/ubuntu-22.04.qcow2}"
shift 2 || true
EXTRA_QEMU_ARGS=("$@")
ISO_IMAGE="/var/lib/libvirt/images/ubuntu-24.04.5-live-server-amd64.iso"
# Find mdev device if UUID not specified
if [[ -z "$MDEV_UUID" ]]; then
echo "Scanning for available mdev devices..."
mapfile -t MDEVS < <(find /sys/bus/mdev/devices -maxdepth 1 -name "????????-????-????-????-????????????" -printf "%f\n" 2>/dev/null)
if [[ ${#MDEVS[@]} -eq 0 ]]; then
echo "ERROR: No mdev devices found. Run create_mdev.sh first."
exit 1
elif [[ ${#MDEVS[@]} -eq 1 ]]; then
MDEV_UUID="${MDEVS[0]}"
echo "Auto-selected mdev: $MDEV_UUID"
else
echo "Multiple mdev devices found:"
for i in "${!MDEVS[@]}"; do
MDEV="${MDEVS[$i]}"
TYPE=$(cat "/sys/bus/mdev/devices/$MDEV/mdev_type/name" 2>/dev/null || echo "unknown")
echo " [$i] $MDEV ($TYPE)"
done
read -p "Select mdev [0-$((${#MDEVS[@]}-1))]: " idx
MDEV_UUID="${MDEVS[$idx]}"
fi
fi
MDEV_PATH="/sys/bus/mdev/devices/$MDEV_UUID"
if [[ ! -d "$MDEV_PATH" ]]; then
echo "ERROR: mdev device $MDEV_UUID not found at $MDEV_PATH"
exit 1
fi
# Verify guest image
if [[ ! -f "$GUEST_IMAGE" ]]; then
echo "ERROR: Guest image not found: $GUEST_IMAGE"
echo "Create one with: qemu-img create -f qcow2 $GUEST_IMAGE 50G"
exit 1
fi
# Check KVM
if [[ ! -r /dev/kvm ]]; then
echo "ERROR: KVM not available (/dev/kvm not readable)"
exit 1
fi
# Check VFIO
if [[ ! -e /dev/vfio/vfio ]]; then
echo "ERROR: VFIO not available"
exit 1
fi
# Get mdev info
VGPU_TYPE=$(cat "$MDEV_PATH/mdev_type/name" 2>/dev/null || echo "unknown")
PCI_ADDR=$(readlink -f "$MDEV_PATH/../../.." | xargs basename)
echo "=========================================="
echo "Launching QEMU with NVIDIA vGPU ($MODE mode)"
echo "=========================================="
echo "mdev UUID: $MDEV_UUID"
echo "vGPU Type: $VGPU_TYPE"
echo "PCI Addr: $PCI_ADDR"
echo "Guest Image: $GUEST_IMAGE"
echo "Extra Args: ${EXTRA_QEMU_ARGS[*]}"
echo "=========================================="
# CPU configuration for vGPU
CPU_OPTS=(
-cpu host,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff,hv_vendor_id=NVIDIA42
-smp 8,sockets=1,cores=8,threads=1
-m 16G,slots=4,maxmem=64G
-mem-prealloc
)
# Memory backing for hugepages (better performance)
HUGEPAGE_OPTS=(
-object memory-backend-file,id=mem,size=16G,mem-path=/dev/hugepages,share=on
-numa node,memdev=mem
)
# VFIO device configuration
VFIO_OPTS=(
-device vfio-pci,sysfsdev="$MDEV_PATH",display=off
)
# Display - use qxl-vga with GTK for local visible window
DISPLAY_OPTS=(
-device qxl-vga
-display gtk
)
# Network
NET_OPTS=(
-netdev user,id=net0,hostfwd=tcp::2222-:22
-device virtio-net-pci,netdev=net0
)
# Storage
if [[ "$MODE" == "install" ]]; then
if [[ ! -f "$ISO_IMAGE" ]]; then
echo "ERROR: ISO image not found: $ISO_IMAGE"
exit 1
fi
STORAGE_OPTS=(
-drive file="$GUEST_IMAGE",format=qcow2,if=virtio,cache=writeback,aio=threads
-drive file="$ISO_IMAGE",format=raw,if=virtio,media=cdrom
)
echo "Installation mode: ISO attached ($ISO_IMAGE)"
else
STORAGE_OPTS=(
-drive file="$GUEST_IMAGE",format=qcow2,if=virtio,cache=writeback,aio=threads
)
echo "Run mode: No ISO attached"
fi
# USB tablet for better mouse integration
USB_OPTS=(
-usb
-device usb-tablet
)
# RNG
RNG_OPTS=(
-object rng-random,id=rng0,filename=/dev/urandom
-device virtio-rng-pci,rng=rng0
)
# Serial log for debugging
SERIAL_OPTS=(
-serial file:/tmp/qemu-serial.log
)
# QEMU command
QEMU_CMD=(
qemu-system-x86_64
-enable-kvm
-machine q35,accel=kvm,kernel_irqchip=split
-bios /usr/share/ovmf/OVMF.fd
"${CPU_OPTS[@]}"
"${HUGEPAGE_OPTS[@]}"
"${VFIO_OPTS[@]}"
"${DISPLAY_OPTS[@]}"
"${NET_OPTS[@]}"
"${STORAGE_OPTS[@]}"
"${USB_OPTS[@]}"
"${RNG_OPTS[@]}"
"${SERIAL_OPTS[@]}"
"${EXTRA_QEMU_ARGS[@]}"
-name "vGPU-Guest-$VGPU_TYPE"
-pidfile "/tmp/qemu-vgpu-$MDEV_UUID.pid"
-daemonize
)
echo "Starting QEMU..."
echo "Command: ${QEMU_CMD[*]}"
echo ""
"${QEMU_CMD[@]}"
sleep 3
if [[ -f "/tmp/qemu-vgpu-$MDEV_UUID.pid" ]]; then
PID=$(cat "/tmp/qemu-vgpu-$MDEV_UUID.pid")
if kill -0 "$PID" 2>/dev/null; then
echo "SUCCESS: QEMU started with PID $PID"
echo ""
echo "GTK window should be visible on your display"
echo "Connect via SSH: ssh -p 2222 user@localhost"
echo ""
echo "To stop: kill $PID"
echo "Serial log: /tmp/qemu-serial.log"
else
echo "ERROR: QEMU failed to start"
exit 1
fi
else
echo "ERROR: QEMU PID file not created"
exit 1
fi
|
