linux-kernel - Re: [PATCH v8 00/25] arm64: MMU enabled kexec relocation

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Message-ID: <033681cb-9fd2-673d-d282-e7c0973e4523@arm.com>
Date:   Wed, 15 Jan 2020 14:36:27 +0000
From:   James Morse <james.morse@....com>
To:     Pavel Tatashin <pasha.tatashin@...een.com>
Cc:     Will Deacon <will@...nel.org>, James Morris <jmorris@...ei.org>,
        Sasha Levin <sashal@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        kexec mailing list <kexec@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bhupesh Sharma <bhsharma@...hat.com>,
        linux-mm <linux-mm@...ck.org>,
        Mark Rutland <mark.rutland@....com>, steve.capper@....com,
        rfontana@...hat.com, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v8 00/25] arm64: MMU enabled kexec relocation

Hi Pavel,

On 08/01/2020 17:59, Pavel Tatashin wrote:
> On Wed, Jan 8, 2020 at 12:32 PM Will Deacon <will@...nel.org> wrote:
>> On Wed, Dec 04, 2019 at 10:59:13AM -0500, Pavel Tatashin wrote:
>>> Many changes compared to version 6, so I decided to send it out now.
>>> James Morse raised an important issue to which I do not have a solution
>>> yet. But would like to discuss it.

(Christmas was badly timed relative to my holiday, so its taken a while for me to catch up)

The memory out of range of the idmap?
I've posted an RFC here[0] that makes hibernate idmap is ttbr0 page. This should let you
reuse that code and test it without a machine with a funny memory layout.


Thanks,

James

[0] https://lore.kernel.org/linux-arm-kernel/20200115143322.214247-1-james.morse@arm.com/