linux-kernel - Re: [PATCH 2/2] arm: use swiotlb for bounce buffer on LPAE configs

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: <20190724175551.GA13073@lst.de>
Date:   Wed, 24 Jul 2019 19:55:51 +0200
From:   Christoph Hellwig <hch@....de>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Christoph Hellwig <hch@....de>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Vignesh Raghavendra <vigneshr@...com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, Roger Quadros <rogerq@...com>
Subject: Re: [PATCH 2/2] arm: use swiotlb for bounce buffer on LPAE configs

On Wed, Jul 24, 2019 at 07:23:50PM +0200, Nicolas Saenz Julienne wrote:
> Out of curiosity, what is the reason stopping us from using dma-direct/swiotlb
> instead of arm_dma_ops altogether?

Nothing fundamental.  We just need to do a very careful piecemeal
migration as the arm code handles a ot of interesting corner case and
we need to ensure we don't break that.  I have various WIP patches
for the easier bits and we can work from there.