Windows 7下QEMU实例脚本化关机与USB设备添加方案咨询

Since you can't use libvirt and need a scriptable way to control your headless QEMU instance (named MyMachineName), let's break down how to handle both shutdown and USB device addition using QEMU Monitor.

First: Ensure Your QEMU Instance Has a Monitor Port Enabled #

Headless QEMU instances can't use the default stdio monitor, so you need to configure a TCP monitor when launching the VM. Add this parameter to your QEMU startup command:

-monitor tcp:127.0.0.1:5555,server,nowait

• tcp:127.0.0.1:5555: Binds the monitor to localhost on port 5555 (you can pick any unused port).
• server: Makes QEMU act as the server waiting for incoming connections.
• nowait: Lets the VM start immediately without waiting for a monitor connection.

Optional: Add Password Protection #

To secure the monitor, add a password parameter:

-monitor tcp:127.0.0.1:5555,server,nowait,password=YourSecurePassword

We'll include how to handle this in the scripts below.

1. Scripting VM Shutdown #

You can use PowerShell (built into Windows 7) or a batch script with telnet to send the system_powerdown command, which triggers an ACPI shutdown (like pressing the physical power button on a PC).

PowerShell Script (Recommended) #

Save this as shutdown_qemu.ps1:

# Connect to QEMU Monitor
$tcpClient = New-Object System.Net.Sockets.TcpClient
$tcpClient.Connect("127.0.0.1", 5555)
$stream = $tcpClient.GetStream()
$writer = New-Object System.IO.StreamWriter($stream)

# Uncomment below if you set a monitor password
# $writer.WriteLine("password YourSecurePassword")

# Send shutdown command
$writer.WriteLine("system_powerdown")
$writer.Flush()

# Optional: Verify response
$reader = New-Object System.IO.StreamReader($stream)
$response = $reader.ReadLine()
Write-Host "Monitor Response: $response"

# Clean up connections
$writer.Close()
$reader.Close()
$stream.Close()
$tcpClient.Close()

Run it via PowerShell:

.\shutdown_qemu.ps1

Batch Script (Using Telnet) #

First, enable Telnet Client in Windows 7:

1. Go to Control Panel → Programs and Features → Turn Windows features on or off
2. Check "Telnet Client" and click OK

Save this as shutdown_qemu.bat:

@echo off
:: Uncomment below if you use a password
:: echo password YourSecurePassword > temp_cmd.txt
:: echo system_powerdown >> temp_cmd.txt
:: type temp_cmd.txt | telnet 127.0.0.1 5555
:: del temp_cmd.txt

:: Without password
echo system_powerdown | telnet 127.0.0.1 5555
timeout 1 >nul

2. Scripting USB Device Addition #

First, get your USB device's Vendor ID (VID) and Product ID (PID):

1. Open Device Manager → Find your USB device → Right-click → Properties → Details tab
2. Select "Hardware Ids" from the dropdown
3. You'll see something like USB\VID_1234&PID_5678 — note down 1234 (VID) and 5678 (PID)

PowerShell Script to Add USB Device #

Save this as add_usb_qemu.ps1:

# Connect to QEMU Monitor
$tcpClient = New-Object System.Net.Sockets.TcpClient
$tcpClient.Connect("127.0.0.1", 5555)
$stream = $tcpClient.GetStream()
$writer = New-Object System.IO.StreamWriter($stream)

# Uncomment below if you set a monitor password
# $writer.WriteLine("password YourSecurePassword")

# Replace with your device's VID and PID
$writer.WriteLine("usb_add host:1234:5678")
$writer.Flush()

# Optional: Verify response
$reader = New-Object System.IO.StreamReader($stream)
$response = $reader.ReadLine()
Write-Host "Monitor Response: $response"

# Clean up connections
$writer.Close()
$reader.Close()
$stream.Close()
$tcpClient.Close()

Run it via PowerShell:

.\add_usb_qemu.ps1

Notes for USB Devices #

• If your device is USB 3.0, make sure your QEMU VM has an xHCI controller added at startup:

  -device qemu-xhci,id=xhci
  

• If QEMU can't grab the device, you may need to temporarily uninstall the device from Windows Device Manager (QEMU will take control once added).

内容的提问来源于stack exchange，提问作者Cutton Eye