Re: Limitation on the number of USB devices supported at the same time

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Hi,

On 10/12/2012 04:03 PM, 李彪 wrote:
hi,

we are using spicy to share the USB devices between thin client and VM in Server.
however, it shows that

-  the menu of spicy can show more than 5 detected USB devices
-  if enable more than 5 USB devices, spicy will prompt the error of out of number of supported USB devices.

I am not sure is there implement limitation in spicy source code ? or this issue can be avoided by changing build configuration ?

The limitation comes from the number of usb-channels / usb-redir devices configured on the
qemu cmdline / inside libvirt

The ehci controller has 6 ports, so if you remove any virtual usb-devices such as a usb-tablet,
you can configure one more channel. For more channels you need to add a second ehci controller
+ companions. Alternatively you could configure the ehci controller to have more ports,
but I think that requires qemu source-code changes atm.

Regards,

Hans
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