linux-kernel - Re: [patch 5/7 v2] export efi runtime memory mapping to sysfs

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Message-ID: <20131119121814.GB11521@console-pimps.org>
Date:	Tue, 19 Nov 2013 12:18:14 +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
Subject: Re: [patch 5/7 v2] export efi runtime memory mapping to sysfs

On Mon, 18 Nov, at 10:16:41AM, Dave Young wrote:
> Matt, desc_version is already in boot_params.efi_info, so kexec-tools
> can get the version from there. I do not need to export it as another
> file.
 
OK, cool.

> I think for now we do not need worry much about the compatibility
> issue, do you think I need add version checking in kexec-tools
> currently? like below?
> 
> if (desc_version != 1) /* current version is 1? */
> 	error out it is not supported

Yes, something like that. If you already have kexec-specific ways of
checking a version number then that's fine. Just make sure that, if the
EFI memory descriptor structure is extended in the future and more files
are exported for each descriptor, kexec-tools say "I don't know how to
build a data structure for from these files".

-- 
Matt Fleming, Intel Open Source Technology Center
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