linux-kernel - Re: [PATCH v1 1/2] x86/power/64: Support unaligned addresses for temporary mapping

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Date:	Tue, 2 Aug 2016 11:01:50 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Thomas Garnier <thgarnie@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H . Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>, Pavel Machek <pavel@....cz>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v1 1/2] x86/power/64: Support unaligned addresses for
 temporary mapping

On Mon, Aug 1, 2016 at 5:36 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Monday, August 01, 2016 10:07:59 AM Thomas Garnier wrote:
>> Correctly setup the temporary mapping for hibernation. Previous
>> implementation assumed the address was aligned on the PGD level. With
>> KASLR memory randomization enabled, the address is randomized on the PUD
>> level. This change supports unaligned address up to PMD.
>
> This code is shared with kexec AFAICS, so it likely is better to push it
> through tip rather than through the PM tree.

Only calling path via arch/x86/power/hibernate_64.c have
   kernel_mapping = true;
other two paths: arch/x86/boot/compressed/pagetable.c and
arch/x86/kernel/machine_kexec_64.c
all have kernel_mapping as false.

maybe that path need simplified kernel_physical_mapping_init() instead?

Thanks

Yinghai