linux-kernel - Re: [PATCH] mm: Work around Intel SNB GTT bug with some physical pages.

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:	Mon, 07 May 2012 16:57:09 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Stéphane Marchesin <marcheu@...omium.org>
Cc:	linux-kernel@...r.kernel.org, keithp@...thp.com,
	torvalds@...ux-foundation.org, seanpaul@...omium.org,
	olofj@...omium.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] mm: Work around Intel SNB GTT bug with some physical pages.

Stéphane Marchesin <marcheu@...omium.org> writes:

> While investing some Sandy Bridge rendering corruption, I found out
> that all physical memory pages below 1MiB were returning garbage when
> read through the GTT. This has been causing graphics corruption (when
> it's used for textures, render targets and pixmaps) and GPU hangups
> (when it's used for GPU batch buffers).

It would be possible to exlude GFP_DMA from the page allocator. That
covers the first 16MB. You just need a custom zone list with ZONE_DMA.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
--
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/