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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 30/10/07 16:40, "Alex Williamson" <alex.williamson@xxxxxx> wrote:

> 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,

I guess we'll see how testing goes over the next little while. If the
bufioreq changes prove to be broken we can back them out before 3.2.0, or
better yet fix them ;-).

 -- Keir



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