linux-kernel - Re: [patch 5/6] export efi runtime memory mapping to sysfs

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Date:	Tue, 29 Oct 2013 13:34:27 +0800
From:	Dave Young <dyoung@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-efi@...r.kernel.org, x86@...nel.org, mjg59@...f.ucam.org,
	hpa@...or.com, James.Bottomley@...senPartnership.com,
	vgoyal@...hat.com, ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.fedoraproject.org, kexec@...ts.infradead.org,
	bp@...en8.de
Subject: Re: [patch 5/6] export efi runtime memory mapping to sysfs

On 10/27/13 at 11:47am, Dave Young wrote:
> kexec kernel will need exactly same mapping for
> efi runtime memory ranges. Thus here export the
> runtime ranges mapping to sysfs, kexec-tools
> will assemble them and pass to 2nd kernel via
> setup_data.
> 
> Introducing a new directly /sys/firmware/efi/efi-runtime-map
> Just like /sys/firmware/memmap. Containing below attribute
> in each file of that directory:
> attribute  num_pages  phys_addr  type  virt_addr
> 
> It will not work for efi 32bit. Only x86_64 currently.
> 
> Signed-off-by: Dave Young <dyoung@...hat.com>
> ---
>  arch/x86/include/asm/efi.h             |    3 
>  arch/x86/platform/efi/efi.c            |   11 ++
>  drivers/firmware/efi/Kconfig           |   10 +
>  drivers/firmware/efi/Makefile          |    1 
>  drivers/firmware/efi/efi-runtime-map.c |  166 +++++++++++++++++++++++++++++++++
>  drivers/firmware/efi/efi.c             |    3 
>  6 files changed, 193 insertions(+), 1 deletion(-)

Remind myself: add below to Documentaion in next version:
Documentation/ABI/testing/sysfs-efi-runtime-map
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