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: <20181110105422.GA20023@zn.tnic>
Date:   Sat, 10 Nov 2018 11:54:22 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        "H. Peter Anvin" <hpa@...or.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, 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, Nov 08, 2018 at 11:51:29AM +0100, Borislav Petkov wrote:
> A global definition which doesn't need allocation?
> 
> Maybe hpa would have another, better idea...

...and he has: just put that address in a new field in struct
boot_params by converting one of the padding arrays there.

Don't forget to document it in Documentation/x86/zero-page.txt

This way you don't need any of the allocation fun or to use setup_data
at all.

HTH.

-- 
Regards/Gruss,
    Boris.

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