From: "H. Peter Anvin" <hpa@zytor.com>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Mike Waychison <mikew@google.com>,
linux-kernel@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCH 3/4] EFI: Add support for variables longer than 1024 bytes
Date: Wed, 14 Dec 2011 14:58:20 -0800 [thread overview]
Message-ID: <4EE92A0C.2040207@zytor.com> (raw)
In-Reply-To: <20111214225728.GA29582@srcf.ucam.org>
On 12/14/2011 02:57 PM, Matthew Garrett wrote:
> On Wed, Dec 14, 2011 at 02:44:34PM -0800, H. Peter Anvin wrote:
>> On 12/14/2011 02:39 PM, Matthew Garrett wrote:
>>>> What are your thoughts on _not_ wrapping efi_variable with
>>>> extended_efi_variable, and instead just using a
>>>> "internal_efi_variable" structure that we copy stuff into/outof. I
>>>> think that would make the memory management for dealing with the
>>>> different sizes a lot easier to follow.
>>>
>>> Hm. I think that'd only work if we expose a new interface. Writes would
>>> be easy enough to handle, but reads still need to work for old apps.
>>>
>>
>> Would making the old ABI readonly and add a new write interface resolve
>> the problem with compat mode?
>
> Yes, but we'd break existing userspace.
>
Obviously. However, you indicated above that that might be acceptable
-- how many things use this ABI to set variables?
-hpa
next prev parent reply other threads:[~2011-12-14 22:58 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-14 21:06 Update UEFI variable support Matthew Garrett
2011-12-14 21:06 ` [PATCH 1/4] uefi: Populate runtime_version Matthew Garrett
2011-12-14 21:06 ` [PATCH 2/4] efi: Only create sysfs entries while booting or running Matthew Garrett
2011-12-14 21:32 ` Mike Waychison
2011-12-14 21:06 ` [PATCH 3/4] EFI: Add support for variables longer than 1024 bytes Matthew Garrett
2011-12-14 22:14 ` Mike Waychison
2011-12-14 22:39 ` Matthew Garrett
2011-12-14 22:44 ` H. Peter Anvin
2011-12-14 22:57 ` Matthew Garrett
2011-12-14 22:58 ` H. Peter Anvin [this message]
2011-12-15 15:44 ` Matthew Garrett
2011-12-14 22:57 ` Mike Waychison
2011-12-14 23:00 ` H. Peter Anvin
2011-12-14 23:06 ` Mike Waychison
2011-12-14 23:22 ` H. Peter Anvin
2011-12-14 23:24 ` Mike Waychison
2011-12-15 15:43 ` Matthew Garrett
2011-12-15 15:46 ` H. Peter Anvin
2011-12-15 15:48 ` Matthew Garrett
2011-12-14 21:06 ` [PATCH 4/4] EFI: Add support for QueryVariableInfo() call Matthew Garrett
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