linux-kernel - Re: [tip:x86/boot] x86/boot: Early parse RSDP and save it in boot

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Message-ID: <20190211121638.GF19618@zn.tnic>
Date:   Mon, 11 Feb 2019 13:16:38 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Chao Fan <fanc.fnst@...fujitsu.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        "Lendacky, Thomas" <thomas.lendacky@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        caoj.fnst@...fujitsu.com, Juergen Gross <jgross@...e.com>,
        Ingo Molnar <mingo@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-tip-commits@...r.kernel.org,
        Matt Fleming <matt@...eblueprint.co.uk>
Subject: Re: [tip:x86/boot] x86/boot: Early parse RSDP and save it in
 boot_params

On Mon, Feb 11, 2019 at 11:55:27AM +0000, Ard Biesheuvel wrote:
> It you have CONFIG_EFI_MIXED enabled, you can in fact use 32-bit UEFI
> runtime services from 64-bit Linux, so just using the tables should be
> fine as well, and I don't think we should hide that behind a Kconfig
> option. (Note that ACPI defines its table layouts without regard for
> architecture bitness, so this is just about the minimal EFI table
> parsing that is required to get at the RDSP)

Ok, understood.

Thx.

-- 
Regards/Gruss,
    Boris.

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