From: Catalin Marinas <catalin.marinas@arm.com>
To: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Ard Biesheuvel <ardb@kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
kernel-hardening@lists.openwall.com
Subject: Re: [RFC PATCH] arm64: remove CONFIG_DEBUG_ALIGN_RODATA feature
Date: Thu, 7 May 2020 14:43:00 +0100 [thread overview]
Message-ID: <20200507134259.GA3180@gaia> (raw)
In-Reply-To: <20200505104404.GB19710@willie-the-truck>
On Tue, May 05, 2020 at 11:44:06AM +0100, Will Deacon wrote:
> Catalin -- did you get anything back from the architects about the cache
> hit behaviour?
Any read from a non-cacheable alias would be coherent with writes using
the same non-cacheable attributes, irrespective of other cacheable
aliases (of course, subject to the cache lines having been previously
cleaned/invalidated to avoid dirty lines evictions).
So as long as the hardware works as per the ARM ARM (B2.8), we don't
need to unmap the non-cacheable DMA buffers from the linear map.
--
Catalin
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-05-07 13:43 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-29 14:12 [RFC PATCH] arm64: remove CONFIG_DEBUG_ALIGN_RODATA feature Ard Biesheuvel
2020-03-30 11:29 ` Mark Rutland
2020-03-30 12:36 ` Ard Biesheuvel
2020-03-30 13:51 ` Will Deacon
2020-03-30 13:53 ` Ard Biesheuvel
2020-03-30 13:59 ` Robin Murphy
2020-03-30 14:04 ` Will Deacon
2020-03-30 14:22 ` Ard Biesheuvel
2020-03-30 14:28 ` Will Deacon
2020-03-30 14:32 ` Ard Biesheuvel
2020-04-02 11:30 ` Catalin Marinas
2020-04-02 12:17 ` Mark Rutland
2020-04-03 7:07 ` Will Deacon
2020-04-03 8:58 ` Ard Biesheuvel
2020-05-05 10:44 ` Will Deacon
2020-05-07 13:43 ` Catalin Marinas [this message]
2020-03-30 13:57 ` Laura Abbott
2020-04-02 11:15 ` Catalin Marinas
2020-04-02 11:24 ` Ard Biesheuvel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200507134259.GA3180@gaia \
--to=catalin.marinas@arm.com \
--cc=ardb@kernel.org \
--cc=kernel-hardening@lists.openwall.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=mark.rutland@arm.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).