linux-kernel - Re: [PATCH v4 05/12] efi: export more efi table variable to sysfs

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Date:	Tue, 26 Nov 2013 15:57:31 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Dave Young <dyoung@...hat.com>
Cc:	linux-kernel@...r.kernel.org, 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.infradead.org, bp@...en8.de, greg@...ah.com,
	toshi.kani@...com
Subject: Re: [PATCH v4 05/12] efi: export more efi table variable to sysfs

On Tue, 26 Nov, at 01:57:50PM, Dave Young wrote:
> Export fw_vendor, runtime and config tables physical
> addresses to /sys/firmware/efi/systab becaue kexec
> kernel will need them.
 
This commit log needs updating.

> From EFI spec these 3 variables will be updated to
> virtual address after entering virtual mode. But
> kernel startup code will need the physical address.
> 
> changelog:
> Greg: add standalone sysfs files instead of add lines to systab
> Document them as testing ABI
> Greg: use group attrs and is_visible
> Boris: align comments lines
> 
> Signed-off-by: Dave Young <dyoung@...hat.com>
> ---
>  Documentation/ABI/testing/sysfs-firmware-efi | 26 ++++++++++++++++
>  arch/x86/platform/efi/efi.c                  |  4 +++
>  drivers/firmware/efi/efi.c                   | 44 ++++++++++++++++++++++++++++
>  include/linux/efi.h                          |  3 ++
>  4 files changed, 77 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-firmware-efi
> 
> diff --git a/Documentation/ABI/testing/sysfs-firmware-efi b/Documentation/ABI/testing/sysfs-firmware-efi
> new file mode 100644
> index 0000000..9252a24
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-firmware-efi
> @@ -0,0 +1,26 @@
> +What:		/sys/firmware/efi/fw_vendor
> +Date:		Nov 2013
> +Contact:	Dave Young <dyoung@...hat.org>

redhat.org eh? Typo or legit?

> +Description:
> +		Shows the physical address of firmware vendor in the EFI
> +		system table.

It shows the physical address of the firmware vendor "entry" or "field"
in the EFI system table.

> +Users:
> +		Kexec Mailing List <kexec@...ts.infradead.org>

The "Kexec mailing list" isn't a user, kexec is.

-- 
Matt Fleming, Intel Open Source Technology Center
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