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Re: [Xen-devel] [PATCH 2/3] x86: real mode support: get EDD info

To: Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 2/3] x86: real mode support: get EDD info
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Fri, 02 Mar 2007 11:35:57 +0000
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On 2/3/07 11:26, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> Possible, but especially on x86-64 undesirable in my opinion.

It's certainly more of a pain to make the mode switch, but not impossible by
any means.

> Also, I'll want
> the base real mode stuff in anyway (regardless of EDD/EDID) in order to
> be able to set up a VESA frame buffer mode for the console. This clearly
> should be done by Xen in order to ensure it knows how to access the
> console in case it is allowed access past dom0 creation.

Oh yes, we definitely want the mode-switching code in Xen. No doubt about
that. The question is whether we pull in the EDD/EDID stuff as well. The
fact that the data format is BIOS-defined does make the current approach
plausible if not particularly tasteful architecturally speaking (but what
BIOS stuff is? :-).

 -- Keir

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