On Fri, 23 Feb 2018 19:41:15 -0700
Will Marler <w...@wmarler.com> wrote:

> Thanks Nick.
> 
> The kernel does not appear to be *entirely* broken for vfio. I figured out
> that if I didn't pass a specific PCI card to my guest, the guest would
> start. So VGA passthrough is still working; the device that breaks the
> kernel (for me anyway) is a PCI USB adapter.

The bug is in the xhci driver, so you could use pci-stub.ids= to make
sure the xhci driver never binds to the controller you're assigning.
Thanks,

Alex

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