linux-kernel - Re: [PATCH] export efi.flags to sysfs

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Message-ID: <20140528145140.GN14863@redhat.com>
Date:	Wed, 28 May 2014 10:51:40 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Dave Young <dyoung@...hat.com>
Cc:	"Fleming, Matt" <matt.fleming@...el.com>,
	"bp@...en8.de" <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
Subject: Re: [PATCH] export efi.flags to sysfs

On Wed, May 28, 2014 at 10:09:35AM +0800, Dave Young wrote:

[..]
> > I've only vaguely been following along with the other thread, so please
> > summarise everything again in your patch. Particularly, I need answers
> > to the following questions,
> > 
> >  - Are you trying to fix a kexec/kdump regression?
> 
> Somehow it is a regression.

Well, it is a *regression*. Previously kdump would work with
SGI UV machines as it used "noefi". Now kexec by default thinks that
efi is enabled and 1:1 mappings are in place and that does not work
with SGI UV machines.

So just providing --noefi is not enough. Somebody needs to automatically
figure out that this SGI machine does not contain 1:1 mapping and hence
need to fall back to old mode. --noefi is good for override.

Thanks
Vivek
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