Re: [PATCH 04/17] Add a test for long USB port paths

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On Mon, Jun 20, 2016 at 08:50:31AM +0200, Gerd Hoffmann wrote:
On Fr, 2016-06-17 at 20:07 +0200, Ján Tomko wrote:
For some reason, we support up to four levels of nested USB devices
in the guest.

FYI: The reason is simply that usb is specified that way.  You can't
chain usb hubs endlessly.


I was under the impression that 7 is the maximum depth.

I see that QEMU errors out at 6 levels for a USB hub:
qemu-git: -device usb-hub,port=1.1.1.1.1.1: usb hub chain too deep

So perhaps up to 6 levels could be allowed for regular devices?

Jan

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