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SubjectRe: [PATCH] Make it possible to disable efivar_ssdt entirely
On Tue, 16 Jun 2020 at 00:47, Ard Biesheuvel <ardb@kernel.org> wrote:
>
> 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?
>

I'll pick this up as a fix (with the ACPI dependency added)

> > + 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
> >

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