linux-kernel - Re: [RESEND PATCH v5 08/11] ppc64/kexec_file: setup backup region for kdump kernel

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Message-ID: <87d04gxt4b.fsf@morokweng.localdomain>
Date:   Mon, 27 Jul 2020 23:37:08 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     Hari Bathini <hbathini@...ux.ibm.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        Sourabh Jain <sourabhjain@...ux.ibm.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Dave Young <dyoung@...hat.com>,
        Petr Tesarik <ptesarik@...e.cz>,
        linuxppc-dev <linuxppc-dev@...abs.org>,
        Kexec-ml <kexec@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Pingfan Liu <piliu@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Nayna Jain <nayna@...ux.ibm.com>
Subject: Re: [RESEND PATCH v5 08/11] ppc64/kexec_file: setup backup region for kdump kernel


Hari Bathini <hbathini@...ux.ibm.com> writes:

> Though kdump kernel boots from loaded address, the first 64KB of it is
> copied down to real 0. So, setup a backup region and let purgatory
> copy the first 64KB of crashed kernel into this backup region before
> booting into kdump kernel. Update reserve map with backup region and
> crashed kernel's memory to avoid kdump kernel from accidentially using
> that memory.
>
> Signed-off-by: Hari Bathini <hbathini@...ux.ibm.com>

Reviewed-by: Thiago Jung Bauermann <bauerman@...ux.ibm.com>

-- 
Thiago Jung Bauermann
IBM Linux Technology Center