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From: ebiederm@xmission.com (Eric W. Biederman)
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Date: Sat, 16 Jul 2011 13:11:47 -0700
In-Reply-To: <20110716162805.GA13127@srcf.ucam.org> (Matthew Garrett's message
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Subject: Re: [RFC][PATCH] Replace a function call chain of
	kmsg_dump(KMSG_DUMP_KEXEC) with static function calls
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To: Matthew Garrett <mjg@redhat.com>
Cc: "dle-develop@lists.sourceforge.net" <dle-develop@lists.sourceforge.net>, "tony.luck@intel.com" <tony.luck@intel.com>, "hpa@zytor.com" <hpa@zytor.com>, "kexec@lists.infradead.org" <kexec@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Satoru Moriya <satoru.moriya@hds.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Jarod Wilson <jwilson@redhat.com>, Americo Wang <xiyou.wangcong@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Seiji Aguchi <seiji.aguchi@hds.com>, Vivek Goyal <vgoyal@redhat.com>

Matthew Garrett <mjg@redhat.com> writes:

2> On Sat, Jul 16, 2011 at 09:16:06AM -0700, Eric W. Biederman wrote:
>
>> What is going on with EFI support?  We are still making efi calls in
>> virtual mode, and we don't have the one unified identity mapped physical
>> page table that hpa and I think others were working a while back.  Even
>> if because of bugs we need to transition EFI to virtual mode we can
>> still set physical to virtual so we don't have to deal with the nonsense.
>
> No, we can't. It doesn't work.
>
>> Can we please make our EFI support ask the minimal from EFI before
>> adding lots more to it?
>
> No.
>
>> Am I wrong in thinking that the core motivation behind this patch is
>> that our EFI support sucks and thus kdump on EFI does not work on some
>> platforms?
>
> Yes, you are.

Will someone please give some explanation?

Without some real understanding of what is going on I'm not inclined
to meet any of this half way and summarily reject every change to
the kexec on panic code path.

Eric

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