linux-efi.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Ard Biesheuvel <ardb@kernel.org>
To: Peter Jones <pjones@redhat.com>
Cc: linux-efi <linux-efi@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Make it possible to disable efivar_ssdt entirely
Date: Tue, 16 Jun 2020 00:47:14 +0200	[thread overview]
Message-ID: <CAMj1kXGLwyk9ibSDXBfeu06HV4x4VtbWbKv20KNzkXpbTxBSXg@mail.gmail.com> (raw)
In-Reply-To: <20200615202408.2242614-1-pjones@redhat.com>

On Mon, 15 Jun 2020 at 22:24, Peter Jones <pjones@redhat.com> wrote:
>
> In most cases, such as CONFIG_ACPI_CUSTOM_DSDT and
> CONFIG_ACPI_TABLE_UPGRADE, boot-time modifications to firmware tables
> are tied to specific Kconfig options.  Currently this is not the case
> for modifying the ACPI SSDT via the efivar_ssdt kernel command line
> option and associated EFI variable.
>
> This patch adds CONFIG_EFI_CUSTOM_SSDT_OVERLAYS, which defaults
> disabled, in order to allow enabling or disabling that feature during
> the build.
>
> Signed-off-by: Peter Jones <pjones@redhat.com>

Thanks Peter.

> ---
>  drivers/firmware/efi/efi.c   |  2 +-
>  drivers/firmware/efi/Kconfig | 11 +++++++++++
>  2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index 48d0188936c..4b12a598ccf 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -192,7 +192,7 @@ static void generic_ops_unregister(void)
>         efivars_unregister(&generic_efivars);
>  }
>
> -#if IS_ENABLED(CONFIG_ACPI)
> +#if IS_ENABLED(CONFIG_EFI_CUSTOM_SSDT_OVERLAYS)
>  #define EFIVAR_SSDT_NAME_MAX   16
>  static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
>  static int __init efivar_ssdt_setup(char *str)
> diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
> index 6b38f9e5d20..fe433f76b03 100644
> --- a/drivers/firmware/efi/Kconfig
> +++ b/drivers/firmware/efi/Kconfig
> @@ -278,3 +278,14 @@ config EFI_EARLYCON
>         depends on SERIAL_EARLYCON && !ARM && !IA64
>         select FONT_SUPPORT
>         select ARCH_USE_MEMREMAP_PROT
> +
> +config EFI_CUSTOM_SSDT_OVERLAYS
> +       bool "Load custom ACPI SSDT overlay from an EFI variable"
> +       depends on EFI_VARS

Shouldn't this depend on ACPI too?

> +       default ACPI_TABLE_UPGRADE
> +       help
> +         Allow loading of an ACPI SSDT overlay from an EFI variable specified
> +         by a kernel command line option.
> +
> +         See Documentation/admin-guide/acpi/ssdt-overlays.rst for more
> +         information.
> --
> 2.26.2
>

  reply	other threads:[~2020-06-15 22:47 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-15 20:24 [PATCH] Make it possible to disable efivar_ssdt entirely Peter Jones
2020-06-15 22:47 ` Ard Biesheuvel [this message]
2020-06-17  9:01   ` Ard Biesheuvel

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAMj1kXGLwyk9ibSDXBfeu06HV4x4VtbWbKv20KNzkXpbTxBSXg@mail.gmail.com \
    --to=ardb@kernel.org \
    --cc=linux-efi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=pjones@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).