linux-kernel - Re: Hibernation considerations

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Message-ID: <Pine.LNX.4.64.0707151526080.25614@asgard.lang.hm>
Date:	Sun, 15 Jul 2007 15:27:32 -0700 (PDT)
From:	david@...g.hm
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	"Dr. David Alan Gilbert" <linux@...blig.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Al Boldi <a1426z@...ab.com>
Subject: Re: Hibernation considerations

On Mon, 16 Jul 2007, Rafael J. Wysocki wrote:

> On Sunday, 15 July 2007 14:58, Dr. David Alan Gilbert wrote:
>> * Rafael J. Wysocki (rjw@...k.pl) wrote:
>>
>>> (5) Hibernation should be transparent from the applications' point of view
>>>
>>>     Generally, applications should not notice that hibernation took place.
>>>     [Note that I don't regard all processes as applications and I think that
>>>     there may be processes which need to handle the hibernation in a special
>>>     way.]  Ideally, for example, if some audio is being played when a
>>>     hibernation starts, the audio player should be able to continue playing the
>>>     same audio after the restore from the point in which it has been
>>>     interrupted by the hibernation.  Also, the CPU affinities and similar
>>
>> That would be _so_ embarrassing in a library; I'd rather the audio
>> player had the opportunity to consider whether restarting was a good idea.
>>
>>> (6) State of devices from before hibernation should be restored, if possible
>>>
>>>     If possible, during a restore devices should be brought back to the same
>>>     state in which they were before the corresponding hibernation.  Of course
>>>     in some situations it might be impossible to do that (eg. the user
>>>     connected the hibernated system to a different IP subnet and then
>>>     restored), but as a general rule, we should do our best to restore the
>>>     state of devices, which is directly related to point (5) above.
>>
>> Or the user unplugs their flash drive after hibernation rather than before.
>>
>> Two things which I think would be nice to consider are:
>>    1) Encryption - I'd actually prefer if my luks device did not
>>        remember the key accross a hibernation; I want to be forced to
>>        reenter the phrase.  However I don't know what the best thing
>>        to do to partitions/applications using the luks device is.
>
> Encryption is possible with both the userland hibernation (aka uswsusp) and
> TuxOnIce (formerly known as suspend2).  Still, I don't consider it as a "must
> have" feature for a framework to be generally useful (many users don't use it
> anyway).

he's talking about the main system useing an encrypted device/partition, 
not the hibernate image being stored encrypted.

This would require the main system 'forget' the keys when it does the 
hinbernate and prompt for it again during the wake-up phase.

David Lang

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