linux-kernel - Re: [PATCH v6 1/3] x86/boot: Add acpitb.c to parse acpi tables

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Message-ID: <CAJZ5v0i5UcV3mngTNdGyefobDOKVOGcSG3Tuz=7-PhQWjyyhmA@mail.gmail.com>
Date:   Tue, 11 Sep 2018 09:41:36 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     fanc.fnst@...fujitsu.com
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>, bhe@...hat.com,
        indou.takao@...fujitsu.com, Cao jin <caoj.fnst@...fujitsu.com>,
        Dou Liyang <douly.fnst@...fujitsu.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-efi@...r.kernel.org,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v6 1/3] x86/boot: Add acpitb.c to parse acpi tables

On Tue, Sep 11, 2018 at 3:28 AM Chao Fan <fanc.fnst@...fujitsu.com> wrote:
>
> On Mon, Sep 10, 2018 at 10:13:49PM +0200, Rafael J. Wysocki wrote:
> >On Mon, Sep 10, 2018 at 2:41 PM Chao Fan <fanc.fnst@...fujitsu.com> wrote:
> >>
> >> Imitate the ACPI code of parsing ACPI tables to dig and read ACPI
> >> tables.
> >
> >Why?
>
> Sorry for that, I have sent the cover letter to you.

Thanks, but please add the explanation here too.

> >
> >> Since some operations are not needed here,
> >
> >What operations?
>
> Such as some operations related to the map between physical address
> and virtual address. Here in compressed period, use physical address
> directely.

This information also needs to go into the changelog of the patch.

> >
> >> functions are simplified. Functions will be used to dig SRAT tables to get
> >> information of memory, so that KASLR can the memory in immovable node.
> >
> >So do you want to parse SRAT only or do something in addition to that?
>
> Only read and get memory information, won't change SRAT.
> So ACPI code will not be changed.

I meant whether or not SRAT is the only table you need to look into.
If so, that also needs to be said in the patch changelog.

Thanks,
Rafael