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References: <159579157320.5790.6748078824637688685.stgit@hbathini>
 <159579235754.5790.5203600072984600891.stgit@hbathini>
From: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Subject: Re: [RESEND PATCH v5 08/11] ppc64/kexec_file: setup backup region for
 kdump kernel
In-reply-to: <159579235754.5790.5203600072984600891.stgit@hbathini>
Date: Mon, 27 Jul 2020 23:37:08 -0300
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To: Hari Bathini <hbathini@linux.ibm.com>
Cc: Pingfan Liu <piliu@redhat.com>, Michael Ellerman <mpe@ellerman.id.au>, Mimi Zohar <zohar@linux.ibm.com>, Nayna Jain <nayna@linux.ibm.com>, Petr Tesarik <ptesarik@suse.cz>, Mahesh J Salgaonkar <mahesh@linux.ibm.com>, Sourabh Jain <sourabhjain@linux.ibm.com>, lkml <linux-kernel@vger.kernel.org>, linuxppc-dev <linuxppc-dev@ozlabs.org>, Eric Biederman <ebiederm@xmission.com>, Andrew Morton <akpm@linux-foundation.org>, Dave Young <dyoung@redhat.com>, Kexec-ml <kexec@lists.infradead.org>, Vivek Goyal <vgoyal@redhat.com>


Hari Bathini <hbathini@linux.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@linux.ibm.com>

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

-- 
Thiago Jung Bauermann
IBM Linux Technology Center

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