linux-kernel - Re: [PATCH] x86-64: disable the GART before allocate aperture

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]

Message-id: <467C27CF.1010205@sun.com>
Date:	Fri, 22 Jun 2007 12:49:35 -0700
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Muli Ben-Yehuda <muli@...ibm.com>
Cc:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86-64: disable the GART before allocate aperture

Muli Ben-Yehuda wrote:
> On Fri, Jun 22, 2007 at 12:19:15PM -0700, Yinghai Lu wrote:
>> [PATCH] x86-64: disable the GART before allocate aperture
>>
>> For K8 system: 4G RAM with memory hole remapping enabled, or more
>> than 4G RAM installed. when mem is allocated for GART, it will do
>> the memset for clear.  and for kexec case, the first kernel already
>> enable that, the memset in second kernel will cause the system
>> restart. So disable that at first before we try to allocate mem for
>> it.
> 
> Why does the memset in the second kernel cause a system restart?
> 
GART is enabled by first kernel, and some driver is using that for DMA.

YH
-
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/