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From: ebiederm@xmission.com (Eric W. Biederman)
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Date: Fri, 23 Oct 2015 14:02:34 -0500
In-Reply-To: <1445540240.30908.134.camel@infradead.org> (Geoff Levand's
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Subject: Re: [PATCH] kexec: Add --lite option
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To: Geoff Levand <geoff@infradead.org>
Cc: panand@redhat.com, kexec@lists.infradead.org, Simon Horman <horms@verge.net.au>, Petitboot@lists.ozlabs.org, Dave Young <dyoung@redhat.com>, vgoyal@redhat.com

Geoff Levand <geoff@infradead.org> writes:

>> > It was reported that on some systems where purgatory is running
>> > without caches enabled the sha256 calculations would take several
>> > minutes.  For bootloaders that just load a new image and
>> > immediately jump into it the loss of the integrity check is worth
>> > the increase in boot speed.  Please consider.  
>> 
>> Pratyush reported the arm64 issue, he sent a patch to fix it with
>> enabling cache for purgatory. I think the patch can fix the problem.
>> Why not fix it? The fix is simple enough and it does not introduce
>> complicate logic.
>
> This patch also is simple, and is architecture independent.  I see this
> feature as an improvement to kexec, not necessarily as a fix for that
> problem.

Disabling image verification is not an improvement, all it does is
allow for a nasty form of heisenbug.


Eric

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