Re: [PATCH 06/12] ARM: kexec: advertise location of bootable RAM
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- To: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
- Subject: Re: [PATCH 06/12] ARM: kexec: advertise location of bootable RAM
- From: Pratyush Anand <panand@xxxxxxxxxx>
- Date: Fri, 29 Apr 2016 20:26:00 +0530
- Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Mark Rutland <mark.rutland@xxxxxxx>, devicetree@xxxxxxxxxxxxxxx, Tony Luck <tony.luck@xxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, Pawel Moll <pawel.moll@xxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>, kexec@xxxxxxxxxxxxxxxxxxx, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Haren Myneni <hbabu@xxxxxxxxxx>, Rob Herring <robh+dt@xxxxxxxxxx>, Eric Biederman <ebiederm@xxxxxxxxxxxx>, Santosh Shilimkar <ssantosh@xxxxxxxxxx>, Kumar Gala <galak@xxxxxxxxxxxxxx>, Vivek Goyal <vgoyal@xxxxxxxxxx>
- In-reply-to: <E1aviF4-0000jG-MO@rmk-PC.arm.linux.org.uk>
- List-id: <linux-ia64.vger.kernel.org>
- References: <20160428092644.GX19428@n2100.arm.linux.org.uk> <E1aviF4-0000jG-MO@rmk-PC.arm.linux.org.uk>
Hi Russell,
On Thu, Apr 28, 2016 at 2:58 PM, Russell King
<rmk+kernel@xxxxxxxxxxxxxxxx> wrote:
> Advertise the location of bootable RAM to kexec-tools. kexec needs to
> know where it can place the kernel in RAM, and so be executable when
> the system needs to jump into it.
>
> Advertise these areas in /proc/iomem with a "System RAM (boot alias)"
> tag.
>
> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Can you please also share git tree path of corresponding kexec-tools changes?
Could it be a better idea (if things in user space become simpler)
that in stead of patch 5 and 6, we pass arch_phys_to_idmap_offset to
user space, and then user space manipulates existing "Crash kernel"
and "System RAM" resources.
~Pratyush
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