[gentoo-user] mounting USB devices on qemu at run time

[gentoo-user] mounting USB devices on qemu at run time

[Mick]

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I used to be able to add a driver on the command line launching qemu and then 
being able to mount/unmount USB devices using the qemu monitor CLI.  Either I 
have forgotten the correct syntax, or something changed with qemu-4.0.0-r50 
and I am no longer able to get USB devices to be recognised on a Windows 
guest.

Here are the relevant lines in the terminal:

 -device qemu-xhci,id=xhci \
 -device usb-host,id=Garmin,vendorid=0x091e,productid=0x28db

On the monitor I get:

(qemu) info usb
 Device 1.0, Port 1, Speed 1.5Mb/s, Product USB Host Device, ID: Garmin

but I am not seeing this coming up in the guest as a USB device and trying 
various permutations on the monitor CLI with 'device_add ...' does not get me 
anywhere.

Google has not helped so far, because many pages simply list deprecated 
commands from years ago.  Would you know how I could mount and unmount devices 
at will in runtime?

-- 
Regards,

Mick

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[gentoo-user] Re: mounting USB devices on qemu at run time

[Mick]

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On Saturday, 12 October 2019 19:35:07 BST you wrote:
> I used to be able to add a driver on the command line launching qemu and
> then being able to mount/unmount USB devices using the qemu monitor CLI. 
> Either I have forgotten the correct syntax, or something changed with
> qemu-4.0.0-r50 and I am no longer able to get USB devices to be recognised
> on a Windows guest.
> 
> Here are the relevant lines in the terminal:
> 
>  -device qemu-xhci,id=xhci \
>  -device usb-host,id=Garmin,vendorid=0x091e,productid=0x28db
> 
> On the monitor I get:
> 
> (qemu) info usb
>  Device 1.0, Port 1, Speed 1.5Mb/s, Product USB Host Device, ID: Garmin
> 
> but I am not seeing this coming up in the guest as a USB device and trying
> various permutations on the monitor CLI with 'device_add ...' does not get
> me anywhere.
> 
> Google has not helped so far, because many pages simply list deprecated
> commands from years ago.  Would you know how I could mount and unmount
> devices at will in runtime?

OK, the problem was access rights.  The device was recognised as root:usb 
instead of GROUP="plugdev".  So, I set this udev rule in the host and it now 
works:

ATTRS{idVendor}=="091e", ATTRS{idProduct}=="28db", MODE="660", GROUP="plugdev"

-- 
Regards,

Mick

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