[Xen-ia64-devel] Re: [PATCH] Re: [Xen-devel] [PATCH] Std VGA Performance

[Alex Williamson <alex.williamson@xxxxxx>]

On Tue, 2007-10-30 at 16:24 +0000, Keir Fraser wrote:
> Yeah, hopefully that's a bug in the comment. I would expect 4-byte accesses
> to be possible and be handled. As for 8-byte accesses, they can certainly
> happen, why not? Unlikely at start of day, but once we're in x86/64 mode
> there's no reason why not.

   Right, and it seems that the "quadword" handling is quite specific to
timeoffset.  It takes advantage of the fact that that there's no address
and stuff some of the data in there.  So, I think both 4 & 8 byte
buffered mmio is likely broken right now on x86.  Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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