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: <20181106140731.GO27491@MiWiFi-R3L-srv>
Date:   Tue, 6 Nov 2018 22:07:31 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        Borislav Petkov <bp@...en8.de>
Cc:     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 11/06/18 at 01:10pm, Borislav Petkov wrote:
> > 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 :)

arch/x86/mm/ident_map.c is a good example, it's shared between
arch/x86/boot/compressed and arch/x86/mm/init_64.c