linux-kernel - Re: [PATCH 5/8] xen/i386: make sure initial VGA/ISA mappings are not overridden

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Date:	Fri, 8 May 2009 12:57:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 5/8] xen/i386: make sure initial VGA/ISA mappings are
	not overridden


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> arch/x86/mm/init_32.c overrides the ISA/VGA mappings with direct mappings
> which do not have _PAGE_IOMAP set, thereby making the ISA space inaccessible.
> 
> This patch adds to the existing hack to make sure the 
> pre-constructed ISA mappings are not incorrectly overwritten.
> 
> This makes 32-bit dom0 VGA work properly.

I'm wondering, should we add this fix to .30 as well, is there any 
relevancy beyond dom0?

> Thanks to Gerd Hoffman for pointing this out.

Please add Reported-by lines in such cases. That way not only does 
the reporting get reported prominently, but the tip-bot will Cc: 
Gerd too on the commit notification too. (which will sometimes spur 
further comments - while a commit hidden somewhere might not)

> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

Please also add impact-footers to all commits you queue up, if you 
want me to pull your tree directly. I can only guess at the impact 
of this one, is it:

[ Impact: fix dom0-Xen-guest boot crash ]

or:

[ Impact: fix dom0-Xen-guest non-working VGA console ]

?

(Please look at latest tip/master for examples about various impact 
lines, their precise format, and what we try to describe in them and 
how.)

Thanks,

	Ingo
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