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[POC] Get acpi table to limit memory scope chosen by KASLR to home SB when "movable_node" is specified

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  [POC] Get acpi table to limit memory scope chosen by KASLR to home  SB when "movable_node" is specified Chao Fan <fanc.fnst@cn.fujitsu.com> - 2017-08-03 11:00 +0200

#1702798 — [POC] Get acpi table to limit memory scope chosen by KASLR to home SB when "movable_node" is specified

Hi all,

Here is an issue about movable_node and KASLR.
Currently, KASLR works well with "mem=", by which we can limit the scope of
memory chosen by KASLR. But if we use "movable_node" independently without
"mem=", we don't know the scope of memory in the home SB, which will cause
the memory of hotplug SB may be chosen by KASLR.
To solve this problem, I want to do this job:
If "movable_node" is specified, try to get the acpi table and find the scope
of memory in home SB, then set "mem_limit".

The order of getting table is:
boot_params
    \-systab
        \-efi tables
             \-rsdp
                 \-rsdt or xsdt
                      \-acpi root table list
                            \-acpi srat mem affinity

I am not sure if it's OK for community.
If there are any problems, please let me know.
Any comments will be welcome.

Thanks,
Chao Fan

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