linux-kernel - Re: Bad DMA from Marvell 9230

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:	Fri, 04 Apr 2014 20:35:03 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Tejun Heo <tj@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Bad DMA from Marvell 9230

On 27/03/14 09:19 AM, Tejun Heo wrote:
> On Thu, Mar 27, 2014 at 05:57:37PM +1100, Benjamin Herrenschmidt wrote:
>> I've contacted Marvell, but I was wondering if anybody here had already
>> experienced something similar or has an idea of what else the chip
>> might be doing wrong so we can try to find a workaround ?
>
> No idea.  First time to hear such problem. :(
>

There are other Marvell controllers that do DMA requests from the wrong 
PCI function ID and cause IOMMU issues, so it seems like testing on such 
systems (or just validating the DMA transactions done by the controller 
by some other means) isn't something that Marvell likes to do. 
Presumably reading from address 0 is normally fine without an IOMMU, so 
this problem wouldn't be noticed otherwise.
--
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/