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I am trying to emulate an mtp device with virt-manager. I see at https://qemu-project.gitlab.io/qemu/system/devices/usb.html that usb-mtp,rootdir=dir as in -device usb-mtp,rootdir=dir could be used to do this with qemu. How can I configure virt-manager to do this (custom xml welcome)?

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I wasn't able to find an xml equivalent of the command, but I was able to change the xml to run the command directly. I needed to insert xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" in the beginning <domain> element and kept the existing type="kvm" and put

<qemu:commandline>  
    <qemu:arg value="-device"/>
    <qemu:arg value="usb-mtp,rootdir=dir"/>
</qemu:commandline>

as the last element before the closing </domain>. https://blog.vmsplice.net/2011/04/how-to-pass-qemu-command-line-options.html and #virt irc on OFTC was helpful with this. Warning: if a change doesn't parse correctly when saving via the virt-manager xml editing pane then it may be removed so take necessary precautions before saving and to check after.

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