Re: [Xen-ia64-devel] [RFC] Extended I/O port space support

[Jes Sorensen <jes@xxxxxxx>]

Alex Williamson wrote:
>    Quite a lot of PCI cards still have I/O port space bars, but
> hopefully any "high speed" devices use their MMIO bars exclusively.
> This is mainly needed for correctness.  Before this patch, a driver
> domain would spew a huge number of errors about trying to map MMIO pages
> that Xen wasn't aware.  Once it finally did boot, most drivers seem to
> avoid using I/O ports, so the devices work ok.  Then Xen would crash if
> I shutdown the domain.  All that is fixed by properly registering and
> setting up the I/O port ranges.  And if there is a driver that still
> pokes I/O port space bars, at least it will work now.

Gotcha!

Don't get me wrong, I am totally in favor of doing this correctness,
I was just surprised to hear it popping up in real life.

Cheers,
Jes

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