Re: USB EHCI patch for 0.14.0?

[Erik Rull <spamfolder@rdsoftware.de>]

David Ahern wrote:
> On 03/11/11 08:18, erik.rull@rdsoftware.de wrote:
>>
>> I tested again with your hints, here my results:
>>
>> - using -device usb-host causes windows not to boot completely, using
>> -usbdevice host:auto:*.* is fine!
>>
>> - using -usbdevice tablet is better than using -device usb-tablet
>>
>>
>> - only one "external" USB device gets detected, the rest is just ignored.
>> qemu does not recognize the device, but the host OS sees it (dmesg output)
>
> I have not used the auto feature. What happens if you disable it and
> instead add the devices you want? I have been able to add both a printer
> and a USB key to a guest -- both on the EHCI bus. And just verified
> again - both printer and USB key accessible within the guest.

I will test that on monday and will let you know about the results.

>> - if the first plugged in device is removed from the usb port and the
>> second (not detected one) is still plugged in, then this second device gets
>> now detected by qemu and is handled to the guest
>
> Interesting. Gerd made a lot of changes to the USB code right before
> 0.14. I have not really followed the change set - or how it might impact
> ehci. It could be a bug independent of ehci as well -- try it without
> the ehci patch and see if the same occurs.

Very good point :-) I've never tested that because I knew that the USB 
printer will then crash my guest :-)
But I will follow that idea on monday as well.

>> Additionally something really interesting:
>> if I disable USB 2.0 in my host BIOS and boot my guest system with the qemu
>> ehci patch, then I get no longer the BSOD in windows when removing the
>> printer! :-) So the patch seems also to improve the usb-uhci stuff.
>
> Our mileage differs here as well. I'm running Fedora 14 on my laptop.
> With the ehci enabled version of qemu-kvm I have no problems connecting
> and disconnecting devices -- host or guest.

Except the not fully functioning auto add feature we're on the same level, 
because I've not tested the manual adding (and I assume / hope that it will 
be successful).

>
> David
>

Best regards,

Erik