linux-kernel - Re: [PATCH v8 03/15] x86: Secure Launch Kconfig

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Message-ID: <CAMj1kXHxvmHo-FWa8PXoZSTVyeSsgFyOaSuXP=2Bhj2YjxCALQ@mail.gmail.com>
Date: Thu, 15 Feb 2024 08:59:28 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Ross Philipson <ross.philipson@...cle.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org, 
	linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org, 
	linux-crypto@...r.kernel.org, kexec@...ts.infradead.org, 
	linux-efi@...r.kernel.org, dpsmith@...rtussolutions.com, tglx@...utronix.de, 
	mingo@...hat.com, bp@...en8.de, hpa@...or.com, dave.hansen@...ux.intel.com, 
	mjg59@...f.ucam.org, James.Bottomley@...senpartnership.com, peterhuewe@....de, 
	jarkko@...nel.org, jgg@...pe.ca, luto@...capital.net, nivedita@...m.mit.edu, 
	herbert@...dor.apana.org.au, davem@...emloft.net, kanth.ghatraju@...cle.com, 
	trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v8 03/15] x86: Secure Launch Kconfig

On Wed, 14 Feb 2024 at 23:31, Ross Philipson <ross.philipson@...cle.com> wrote:
>
> Initial bits to bring in Secure Launch functionality. Add Kconfig
> options for compiling in/out the Secure Launch code.
>
> Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
> ---
>  arch/x86/Kconfig | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 5edec175b9bf..d96d75f6f1a9 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2071,6 +2071,18 @@ config EFI_RUNTIME_MAP
>
>           See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
>
> +config SECURE_LAUNCH
> +       bool "Secure Launch support"
> +       default n

'n' is already the default, so you can drop this line.

> +       depends on X86_64 && X86_X2APIC

This depends on CONFIG_TCG_TPM as well (I got build failures without it)

> +       help
> +          The Secure Launch feature allows a kernel to be loaded
> +          directly through an Intel TXT measured launch. Intel TXT
> +          establishes a Dynamic Root of Trust for Measurement (DRTM)
> +          where the CPU measures the kernel image. This feature then
> +          continues the measurement chain over kernel configuration
> +          information and init images.
> +
>  source "kernel/Kconfig.hz"
>
>  config ARCH_SUPPORTS_KEXEC
> --
> 2.39.3
>