linux-kernel - Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v2

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 27 Apr 2008 22:50:20 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Mika Fischer <mika.fischer@...pnet.de>
Cc:	Ingo Molnar <mingo@...e.hu>, yhlu.kernel@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Gabriel C <nix.or.die@...glemail.com>
Subject: Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete
   layout v2

On Mon, 28 Apr 2008 17:28:21 +0200
Mika Fischer <mika.fischer@...pnet.de> wrote:

> Arjan van de Ven schrieb:
> > yep one should not touch existing MTRRs. If you run out, tough luck.
> > Thats what we have PAT for.
> > Changing them anyway is a deathtrap with various things,
> > suspend/resume being only one of the nasty cases.
> 
> Hm. I currently have to remove the offending (i.e. overlapping my
> video memory) MTRRs and split them so that they have a hole where my
> video memory is.

I'm not arguing that it sometimes works. It's just a big trap to default enable ;(


> 
> Ah, so the new X will be able to use the video memory in
> write-combining mode even if I have an MTRR saying this area is
> uncachable or write-back?

yes.
When it gets released...
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/