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Subject: Re: [POC] Get acpi table to limit memory scope chosen by KASLR to
 home SB when "movable_node" is specified
To: Chao Fan <fanc.fnst@cn.fujitsu.com>, <linux-kernel@vger.kernel.org>,
        <x86@kernel.org>
References: <20170803085155.GE25014@localhost.localdomain>
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From: Dou Liyang <douly.fnst@cn.fujitsu.com>
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Date: Thu, 3 Aug 2017 16:59:26 +0800
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Cc ACPI maintainers and mail list

At 08/03/2017 04:51 PM, Chao Fan wrote:
> 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
>
>
>