From: Daniel Thompson <daniel.thompson@linaro.org>
To: Christopher Covington <cov@codeaurora.org>
Cc: "Russell King" <linux@arm.linux.org.uk>,
"Will Deacon" <will.deacon@arm.com>,
"Mark Rutland" <mark.rutland@arm.com>,
"Nicolas Pitre" <nico@linaro.org>,
"Jon Medhurst (Tixy)" <tixy@linaro.org>,
"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
"Wang Nan" <wangnan0@huawei.com>,
"Nathan Lynch" <nathan_lynch@mentor.com>,
"Stephen Boyd" <sboyd@codeaurora.org>,
"Yingjoe Chen" <yingjoe.chen@mediatek.com>,
"Masahiro Yamada" <yamada.m@jp.panasonic.com>,
"Gregory CLEMENT" <gregory.clement@free-electrons.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Kees Cook" <keescook@chromium.org>,
"Florian Fainelli" <f.fainelli@gmail.com>,
"Maxime Coquelin stm32" <mcoquelin.stm32@gmail.com>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Paul Bolle" <pebolle@tiscali.nl>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm: Handle starting up in secure mode
Date: Thu, 27 Aug 2015 17:17:11 +0100 [thread overview]
Message-ID: <55DF3807.40506@linaro.org> (raw)
In-Reply-To: <1440424572-27116-1-git-send-email-cov@codeaurora.org>
On 24/08/15 14:55, Christopher Covington wrote:
> ARM Linux appears to have never been made aware of the ARMv7 security
> extensions. When CONFIG_ARM_SEC_EXT=y, have it probe for its security
> state by checking whether CNTFRQ is writeable and potentially make
> mode changes based on the information. The most features are available
> from hypervisor (HYP) mode, so switch to it possible. Failing that,
> prefer non-secure supervisor (SVC) mode to secure supervisor mode.
If there is no hypervisor mode available what benefit do we get from
transitioning to non-secure mode?
When running in secure mode we retain access to some potentially useful
features such as having access to FIQ.
Daniel.
prev parent reply other threads:[~2015-08-27 16:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-24 13:55 Christopher Covington
2015-08-26 10:37 ` Ard Biesheuvel
2015-08-26 10:39 ` Dave Martin
2015-08-26 10:48 ` Russell King - ARM Linux
2015-08-26 14:19 ` Christopher Covington
2015-08-27 15:28 ` Dave Martin
2015-09-08 13:21 ` Linus Walleij
2015-08-26 10:46 ` Russell King - ARM Linux
2015-08-27 16:17 ` Daniel Thompson [this message]
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=55DF3807.40506@linaro.org \
--to=daniel.thompson@linaro.org \
--cc=ard.biesheuvel@linaro.org \
--cc=arnd@arndb.de \
--cc=cov@codeaurora.org \
--cc=f.fainelli@gmail.com \
--cc=gregory.clement@free-electrons.com \
--cc=keescook@chromium.org \
--cc=linus.walleij@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@arm.linux.org.uk \
--cc=mark.rutland@arm.com \
--cc=mcoquelin.stm32@gmail.com \
--cc=nathan_lynch@mentor.com \
--cc=nico@linaro.org \
--cc=pebolle@tiscali.nl \
--cc=sboyd@codeaurora.org \
--cc=tixy@linaro.org \
--cc=u.kleine-koenig@pengutronix.de \
--cc=wangnan0@huawei.com \
--cc=will.deacon@arm.com \
--cc=yamada.m@jp.panasonic.com \
--cc=yingjoe.chen@mediatek.com \
/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
Powered by JetHome