Re: [RESEND PATCH v5 06/11] ppc64/kexec_file: restrict memory usage of kdump kernel

From: Thiago Jung Bauermann
Date: Mon Jul 27 2020 - 22:10:37 EST

Hari Bathini <hbathini@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
> Tested-by: Pingfan Liu <piliu@xxxxxxxxxx>

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

Reviewed-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>

Thiago Jung Bauermann
IBM Linux Technology Center