Re: [Qemu-devel] Re: [PATCH 08/12] block: Catch attempt to attach multiple devices to a blockdev

[Gerd Hoffmann]

  Hi,

> > Note that currently the usb storage emulation is extremly broken anyway,
> > just writing to it produces I/O errors after a short while.  This means
> > it can't be used very much at all.
>
> When I tried last time, it did produce lots of kernel error messages in
> the guest, but in the end the data was written correctly. So it doesn't
> seem to be completely unusable.

I think it is actually the linux kernel being at fault here.  I've seen 
I/O errors on real hardware too, on my pretty old laptop which has usb 
1.1 only.  Probably something like timeouts being *way* too low for usb 
1.1 xfer speeds.

cheers,
  Gerd