linux-kernel - Re: [PATCH v2 1/3] x86, boot: add mmio serial during compressed boot

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Message-ID: <51E5A0A9.90108@zytor.com>
Date:	Tue, 16 Jul 2013 12:36:09 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kees Cook <keescook@...omium.org>
CC:	Yinghai Lu <yinghai@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Landley <rob@...dley.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH v2 1/3] x86, boot: add mmio serial during compressed boot

On 07/16/2013 12:31 PM, Kees Cook wrote:
> 
> Could the first step be documenting the limitation? I've found this
> patch extremely useful for my case already, and I imagine there might
> be other people that need the early mmio stuff to. Generally the
> compressed boot serial console stuff is going to be used in the more
> common non-kexec situations at least for a while.
> 
> Does this patch create any _problems_? Right now, neither low nor >4G
> kernel can use an mmio serial port. :) This this, we'd at least gain
> it for the low case.
> 

Even documenting the limitation is likely to end up with a bunch of
emails asking why their kernel crashed.

I think setting up a dynamic #PF handler is the right thing for the
decompressor, we already did for the kernel proper.

	-hpa


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