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由 Guannan Ren 提交于
Add an optional 'type' attribute to <target> element of serial port device. There are two choices for its value, 'isa-serial' and 'usb-serial'. For backward compatibility, when attribute 'type' is missing the 'isa-serial' will be chosen as before. Libvirt XML sample <serial type='pty'> <target type='usb-serial' port='0'/> <address type='usb' bus='0' port='1'/> </serial> qemu commandline: qemu ${other_vm_args} \ -chardev pty,id=charserial0 \ -device usb-serial,chardev=charserial0,id=serial0,bus=usb.0,port=1
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