Re: [Xen-devel] [TESTDAY] PV / HVM pass-through works when IOMMU present; weird failures when not

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-06-28 at 17:00 +0100, Jan Beulich wrote:
> Also, I can't really see how the guest would be able to interact
> with a half way assigned device properly - I could imagine you
> being able to look at its config space, and perhaps load the
> driver, but I can't see an I/O to succeed, at least not as long
> as any bus mastering is being used the device (this ought to
> crash this guest, another guest, or the host, or deliver corrupt
> data). Purely port based I/O would likely work, but other than
> serial cards I can't think of many things that would do so.

That's what I was thinking. I would be useful to know what sort of
device this is and to what extent it is "working".

Ian.



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