linux-kernel - Re: [PATCH RFC 0/3] riscv: Add DMA

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:   Wed, 19 May 2021 08:06:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     Guo Ren <guoren@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, Anup Patel <anup.patel@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        drew@...gleboard.org, wefu@...hat.com, lazyparser@...il.com,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-sunxi@...ts.linux.dev, Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH RFC 0/3] riscv: Add DMA_COHERENT support

On Wed, May 19, 2021 at 02:05:00PM +0800, Guo Ren wrote:
> Since the existing RISC-V ISA cannot solve this problem, it is better
> to provide some configuration for the SOC vendor to customize.

We've been talking about this problem for close to five years.  So no,
if you don't manage to get the feature into the ISA it can't be
supported.