linux-kernel - Re: [PATCH v8 0/3] x86/boot/KASLR: Parse ACPI table and limit kaslr in immovable memory

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Message-ID: <20181106121023.GF13712@zn.tnic>
Date:   Tue, 6 Nov 2018 13:10:23 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Masayoshi Mizuma <msys.mizuma@...il.com>
Cc:     Baoquan He <bhe@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Chao Fan <fanc.fnst@...fujitsu.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-efi@...r.kernel.org, linux-acpi@...r.kernel.org,
        mingo@...hat.com, hpa@...or.com, keescook@...omium.org,
        rjw@...ysocki.net, lenb@...nel.org, ard.biesheuvel@...aro.org,
        indou.takao@...fujitsu.com, caoj.fnst@...fujitsu.com
Subject: Re: [PATCH v8 0/3] x86/boot/KASLR: Parse ACPI table and limit kaslr
 in immovable memory

On Thu, Oct 25, 2018 at 09:40:51AM -0400, Masayoshi Mizuma wrote:
> My actual use case is for EFI boxes, however, I think it's better to useful
> for legacy BIOS as well because memory hot-plug affinity in SRAT and KASLR
> are available on legacy BIOS.
> Actually, we can create such environment in qemu.

Ah, right, qemu. :)

> I have another idea to solve this issue. Adding a SRAT parsing code
> to arch/x86/mm/kaslr.c. It is useful for both EFI and BIOS and
> also we don't need a new kernel parameter...
> Dose the idea make sense?

The more automatic stuff we do and we don't have to involve the user,
the better.

However, lemme look at Chao's current patchset first - we should not go
nuts by putting SRAT parsing everywhere :)

-- 
Regards/Gruss,
    Boris.

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