linux-kernel - Re: [tpmdd-devel] [PATCH] tpm: fix cacheline alignment for DMA-able buffers

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>] [day] [month] [year] [list]

Message-ID: <20160809220837.GA5535@obsidianresearch.com>
Date:	Tue, 9 Aug 2016 16:08:38 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Dmitry Torokhov <dtor@...omium.org>
Cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Christophe Ricard <christophe.ricard@...il.com>,
	tpmdd-devel@...ts.sourceforge.net,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [tpmdd-devel] [PATCH] tpm: fix cacheline alignment for DMA-able
 buffers

On Tue, Aug 09, 2016 at 08:18:00AM -0700, Dmitry Torokhov wrote:

>    Well, the main reason was simplicity and invasiveness of the
>    change.

Well, it isn't simple, because the proposed patches have had subtle
problems with DMA. Simple is to use a guaranteed dma-able allocation
for DMA memory and stop trying to over optimize.

Jason