linux-kernel - Re: [PATCH v12 1/5] x86/boot: Add get_acpi_rsdp() to parse RSDP in cmdline from KEXEC

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Date:   Wed, 5 Dec 2018 15:58:14 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Chao Fan <fanc.fnst@...fujitsu.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, keescook@...omium.org,
        bhe@...hat.com, msys.mizuma@...il.com, indou.takao@...fujitsu.com,
        caoj.fnst@...fujitsu.com
Subject: Re: [PATCH v12 1/5] x86/boot: Add get_acpi_rsdp() to parse RSDP in
 cmdline from KEXEC

On Thu, Nov 29, 2018 at 04:16:27PM +0800, Chao Fan wrote:
> To fix the conflict between KASLR and memory-hotremove, memory
> information in SRAT table is necessary.
> 
> ACPI SRAT (System/Static Resource Affinity Table) can show the details
> about memory ranges, including ranges of memory provided by hot-added
> memory devices. SRAT table must be introduced by RSDP pointer (Root
> System Description Pointer). So RSDP should be found firstly.
> 
> When booting form KEXEC/EFI/BIOS, the methods to find RSDP pointer
> are different. When booting from KEXEC, 'acpi_rsdp' may have been
> added to cmdline, so parse the cmdline and find the RSDP pointer.
> 
> Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
> ---
>  arch/x86/boot/compressed/acpitb.c | 33 +++++++++++++++++++++++++++++++
>  arch/x86/boot/compressed/misc.c   |  5 +++++
>  arch/x86/boot/compressed/misc.h   |  4 ++++
>  lib/kstrtox.c                     |  5 +++++
>  4 files changed, 47 insertions(+)
>  create mode 100644 arch/x86/boot/compressed/acpitb.c
> 
> diff --git a/arch/x86/boot/compressed/acpitb.c b/arch/x86/boot/compressed/acpitb.c
> new file mode 100644
> index 000000000000..614c45655cff
> --- /dev/null
> +++ b/arch/x86/boot/compressed/acpitb.c

Also, I guess calling that file simply "acpi.c" is good enough.

> @@ -0,0 +1,33 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#define BOOT_CTYPE_H
> +#include "misc.h"
> +#include "error.h"
> +
> +#include <linux/efi.h>
> +#include <asm/efi.h>

asm/ headers come after linux/ header.

...

Thx.

-- 
Regards/Gruss,
    Boris.

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