From mboxrd@z Thu Jan  1 00:00:00 1970
From: cov@codeaurora.org (Christopher Covington)
Date: Fri, 11 Jan 2013 12:22:20 -0500
Subject: [PATCH 6/6] ARM: virt: hide CONFIG_ARM_VIRT_EXT from user
In-Reply-To: <20130111164330.GA12464@mudshark.cambridge.arm.com>
References: <1357918457-20469-1-git-send-email-will.deacon@arm.com>
 <1357918457-20469-7-git-send-email-will.deacon@arm.com>
 <50F032F0.3070906@codeaurora.org>
 <20130111164330.GA12464@mudshark.cambridge.arm.com>
Message-ID: <50F04A4C.6020302@codeaurora.org>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On 01/11/2013 11:43 AM, Will Deacon wrote:
> On Fri, Jan 11, 2013 at 03:42:40PM +0000, Christopher Covington wrote:
>> Hi Will,
> 
> Hello,
> 
>> On 01/11/2013 10:34 AM, Will Deacon wrote:
>>> ARM_VIRT_EXT is a property of CPU_V7, but does not adversely affect
>>> other CPUs that can be built into the same kernel image (i.e. ARMv6+).
>>>
>>> This patch defaults ARM_VIRT_EXT to y if CPU_V7, allowing hypervisors
>>> such as KVM to make better use of the option and being able to rely
>>> on hyp-mode boot support.
>>
>> [...]
>>
>>> @@ -640,11 +641,6 @@ config ARM_VIRT_EXT
>>>  	  use of this feature.  Refer to Documentation/arm/Booting for
>>>  	  details.
>>>  
>>> -	  It is safe to enable this option even if the kernel may not be
>>> -	  booted in HYP mode, may not have support for the
>>> -	  virtualization extensions, or may be booted with a
>>> -	  non-compliant bootloader.
>>
>> Why take this out?
> 
> I just removed that last paragraph because it's not user-selectable anymore,
> so this comment about enabling the option is redundant. I could remove all
> of the help text, but we have it for some other options that are selected
> automatically and it has a pointer to some documentation too.

It's not a big deal, but that paragraph helped me understand the (lack of)
ramifications for v7 CPU's without the virtualization extensions, and I figure
it might still be helpful for others as well.

Christopher

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