Hi, > 1) Devices get resetted again and again on the host side and do not work > properly on the guest side - they work fine on the host side outside qemu.
I see those too. Not clear what is going on here. usbfs requests seem to get stuck now and then for not-yet known reasons. Sometimes they finish after a few seconds. Sometimes they get stuck long enougth that some timeout within the guest fires and the guest resets the device. I see those with a F16 guest which polls the usb stick with test-unit-ready requests. Letting it run idle produces a ... usb 1-6: reset high speed USB device number 3 using ehci_hcd ... log line line in the guest now and then. Tried to write a small reproducer (tool constantly sending test-unit-ready via usbfs), but that one works just fine without any hangs. cheers, Gerd
