From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v2 1/3] x86, boot: add mmio serial during compressed boot
Date: Tue, 16 Jul 2013 12:41:59 -0700
Message-ID: <51E5A207.30204@zytor.com>
References: <1373659660-31123-1-git-send-email-keescook@chromium.org> <20130712203802.GA14702@www.outflux.net> <CAE9FiQWJin8-hXsodo46vhYPMrWiiboEVQySPO-LgXtebYmUzw@mail.gmail.com> <CAGXu5jJs5ve-31AYKbv6EaV5PKCf5cOEeWTRsYsi_kBbLWj5uQ@mail.gmail.com> <51E5A0A9.90108@zytor.com> <CAGXu5jJJXgnJxuvc851UZ4Du10HSBJnDWc7rKgRb4_=ojMmtug@mail.gmail.com>
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To: Kees Cook <keescook@chromium.org>
Cc: Yinghai Lu <yinghai@kernel.org>, "Eric W. Biederman" <ebiederm@xmission.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Rob Landley <rob@landley.net>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, the arch/x86 maintainers <x86@kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>, linux-serial@vger.kernel.org

On 07/16/2013 12:40 PM, Kees Cook wrote:
>>
>> I think setting up a dynamic #PF handler is the right thing for the
>> decompressor, we already did for the kernel proper.
> 
> I'm not sure how to accomplish this yet. I'm still trying to
> understand how the page tables are arranged. :)
> 

Look at the handler at the top of arch/x86/kernel/head64.c.

	-hpa