[vfio-users] USB enumeration (uPD720201)

[Alex Williamson]

On Thu, Dec 3, 2015 at 12:38 PM, Brett Foster <fosterb at edgeandvertex.org>
wrote:

> Switched to a 2-port ASMedia controller and I was able to attach a hub out
> of the box. Yay! So the Renesas card is garbage.
>

Hmm, let me offer another data point; if I assign the onboard ASMedia USB3
controller to my VM, I often get hangs when OVMF enumerates attached
devices and it's a crap shoot whether devices will work after a VM reboot.
On the other hand, my Renesas card works much more reliably.  However, I've
also found that TI based USB3 chips work far more reliably than either of
those for non-VM, bare metal use (no VM experience on those).  The early
versions of the Renesas chips are pretty crappy, but I infer that newer
ones are more well behaved.  Personally I'm not a fan of any ASMedia
components and avoid them in my purchasing decisions.  Thanks,

Alex
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