方法
1，直接使用以下命令即可自動重定向usb設備（除HID設備）
remote-viewer --spice-usbredir-redirect-on-connect="0x03,-1,-1,-1,0|-1,-1,-1,-1,1" console.vv
2，如果使用以下命令，則僅在插拔usb接口才會重定向usb設備：
remote-viewer --spice-usbredir-auto-redirect-filter="0x03,-1,-1,-1,0|-1,-1,-1,-1,1"
解釋：
0x03,-1,-1,-1,0 代表過濾此HID（human interface device）設備，即鼠標、鍵盤、游戲手柄等。
-1,-1,-1,-1,1 代表允許所有設備連接。
| 多個規則組合，排前面的優先匹配規則（個人理解，不知道有沒有錯）
規則格式：
<class>,<vendor>,<product>,<version>,<allow>
<class>,<vendor>,<product>,<version>使用 -1 代表任何值
spice usb拓展
以下內容全部來源於：https://www.spice-space.org/usbredir.html
Using libvirt
The following libvirt XML will configure a guest with USB2 support and the ability to redirect 3 devices simultaneously:
<controller type='usb' index='0' model='ich9-ehci1'/> <controller type='usb' index='0' model='ich9-uhci1'> <master startport='0'/> </controller> <controller type='usb' index='0' model='ich9-uhci2'> <master startport='2'/> </controller> <controller type='usb' index='0' model='ich9-uhci3'> <master startport='4'/> </controller> <redirdev bus='usb' type='spicevmc'/> <redirdev bus='usb' type='spicevmc'/> <redirdev bus='usb' type='spicevmc'/>
For USB3 support, the configuration can be simplified to:
<controller type='usb' index='0' model='nec-xhci'/> <redirdev bus='usb' type='spicevmc'/> <redirdev bus='usb' type='spicevmc'/> <redirdev bus='usb' type='spicevmc'/>
Using QEMU
The following qemu options will configure a guest with USB2 support and the ability to redirect 3 devices simultaneously
-device ich9-usb-ehci1,id=usb \ -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,multifunction=on \ -device ich9-usb-uhci2,masterbus=usb.0,firstport=2 \ -device ich9-usb-uhci3,masterbus=usb.0,firstport=4 \ -chardev spicevmc,name=usbredir,id=usbredirchardev1 \ -device usb-redir,chardev=usbredirchardev1,id=usbredirdev1 \ -chardev spicevmc,name=usbredir,id=usbredirchardev2 \ -device usb-redir,chardev=usbredirchardev2,id=usbredirdev2 \ -chardev spicevmc,name=usbredir,id=usbredirchardev3 \ -device usb-redir,chardev=usbredirchardev3,id=usbredirdev3
For USB3 support, the configuration can be simplified to:
-device nec-usb-xhci,id=usb \ -chardev spicevmc,name=usbredir,id=usbredirchardev1 \ -device usb-redir,chardev=usbredirchardev1,id=usbredirdev1 \ -chardev spicevmc,name=usbredir,id=usbredirchardev2 \ -device usb-redir,chardev=usbredirchardev2,id=usbredirdev2 \ -chardev spicevmc,name=usbredir,id=usbredirchardev3 \ -device usb-redir,chardev=usbredirchardev3,id=usbredirdev3
Host Filtering
Set a string specifying a filter to determine which USB devices are allowed/blocked to redirect USB traffic to the guest.
Using QEMU
-device usb-redir,filter='0x03:-1:-1:-1:0|-1:-1:-1:-1:1',chardev=usbredirchardev1,id=usbredirdev1
Note that in a QEMU command, the filter string should use a ':' character as a separator within the rule.
Using libvirt
...
<devices>
...
<redirfilter> <usbdev class='0x08' vendor='0x1234' product='0xbeef' version='2.56' allow='yes'/> <usbdev allow='no'/> </redirfilter> </devices> ...