Re: [PATCH] blockdev: add 'media=cdrom' argument to support usb cdrom emulated as cdrom

[Paolo Bonzini]

On 12/9/22 03:28, Zhipeng Lu wrote:
Thanks.
  -device usb-bot,id=bot0
  -device scsi-{cd,hd},bus=bot0.0,drive=drive0

Qemu implements virtio scsi to emulate scsi controller, but if the 
virtual machine(for example windows guest os) don't install the virtio 
scsi driver, it don't work
i need the function: emulate cdrom in guest, support hotplug and unplug, 
not  depend on virtio driver

usb-bot *is* a SCSI controller and it does not require drivers in the 
guest.  It is not very high-performance, but as you say it has hotplug 
functionality via USB.

Paolo