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References: <159579157320.5790.6748078824637688685.stgit@hbathini>
 <159579231812.5790.16096865978767385505.stgit@hbathini>
From: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Subject: Re: [RESEND PATCH v5 06/11] ppc64/kexec_file: restrict memory usage
 of kdump kernel
In-reply-to: <159579231812.5790.16096865978767385505.stgit@hbathini>
Date: Mon, 27 Jul 2020 23:10:08 -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:

> Kdump kernel, used for capturing the kernel core image, is supposed
> to use only specific memory regions to avoid corrupting the image to
> be captured. The regions are crashkernel range - the memory reserved
> explicitly for kdump kernel, memory used for the tce-table, the OPAL
> region and RTAS region as applicable. Restrict kdump kernel memory
> to use only these regions by setting up usable-memory DT property.
> Also, tell the kdump kernel to run at the loaded address by setting
> the magic word at 0x5c.
>
> Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
> Tested-by: Pingfan Liu <piliu@redhat.com>

I liked the new versions of get_node_path_size() and get_node_path().

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

--
Thiago Jung Bauermann
IBM Linux Technology Center

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