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Re: [Xen-devel] RE: VP problematic for backend drivers on IA64?

from [Alex Williamson]

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To:	"Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>
Subject:	Re: [Xen-devel] RE: VP problematic for backend drivers on IA64?
From:	Alex Williamson <alex.williamson@xxxxxx>
Date:	Mon, 23 Jan 2006 08:52:57 -0700
Cc:	okrieg@xxxxxxxxxx, Jon Mason <jdmason@xxxxxxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Sun, 2006-01-22 at 14:45 -0800, Magenheimer, Dan (HP Labs Fort
Collins) wrote:
> 
> Yes, unless there are legacy drivers/devices that circumvent the
> DMA interface.  I don't know if this is the case on some/many/all
> Linux/ia64 configurations... perhaps someone with more familiarity
> with a broad range of Linux/ia64 configurations can comment?  I
> would be concerned with, for example, IDE, GART, VGA, console...?

   VGA and serial consoles don't typically do DMA-like operations AFAIK.
They may live in legacy address spaces, but I think their programming
model is entirely reads and writes.  All IDE chips can operate in
standard PCI mode these days, so they should be covered by the DMA-API.
GARTs are similar to IOMMUs, they'll need to be modified to understand
the translation.

        Alex

-- 
Alex Williamson                             HP Linux & Open Source Lab

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