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From: cov@codeaurora.org (Christopher Covington)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v10 4/6] ARM: add vdso user-space code
Date: Wed, 25 Feb 2015 11:56:36 -0500	[thread overview]
Message-ID: <54EDFEC4.7060600@codeaurora.org> (raw)
In-Reply-To: <20150224101754.GA27420@e104818-lin.cambridge.arm.com>

Hi Catalin,

On 02/24/2015 05:17 AM, Catalin Marinas wrote:

[snip]

> Writing CNTFRQ from non-secure mode would trap as well.

Are you saying it could A) cause an exception targeting the current EL/mode
but not others, or B) cause an exception targeting the current or another EL/mode?

[snip]

> The detection mechanism would have to involve trapping of an undefined
> instruction but it doesn't need to be done early during boot.

I put detection during early boot because I wanted to potentially change
ELs/modes during early boot.

Thanks,
Chris

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

  reply	other threads:[~2015-02-25 16:56 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-22 19:17 [PATCH v10 0/6] ARM: VDSO Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 1/6] ARM: use _install_special_mapping for sigpage Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 2/6] ARM: place sigpage at a random offset above stack Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 3/6] ARM: miscellaneous vdso infrastructure, preparation Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 4/6] ARM: add vdso user-space code Nathan Lynch
2015-02-13  4:36   ` Venkappa Mala
2015-02-13 10:54     ` Catalin Marinas
2015-02-13 12:01       ` Venkappa Mala
2015-02-13 14:14         ` Catalin Marinas
2015-02-13 14:56           ` Venkappa Mala
2015-02-13 15:32             ` Catalin Marinas
2015-02-18 12:12               ` Venkappa Mala
2015-02-20 21:52                 ` Christopher Covington
2015-02-24 10:17                   ` Catalin Marinas
2015-02-25 16:56                     ` Christopher Covington [this message]
2015-02-25 17:17                       ` Catalin Marinas
2015-02-16 20:05     ` Nathan Lynch
2015-02-19 12:26       ` Venkappa Mala
2014-09-22 19:18 ` [PATCH v10 5/6] ARM: vdso initialization, mapping, and synchronization Nathan Lynch
2014-09-22 19:18 ` [PATCH v10 6/6] ARM: add CONFIG_VDSO Kconfig and Makefile bits Nathan Lynch

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