[PATCH v14 02/19] x86: Secure Launch Kconfig

[Randy Dunlap]

Hi,

On 4/21/25 9:26 AM, Ross Philipson wrote:
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 4b9f378e05f6..badde1e9742e 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2001,6 +2001,17 @@ config EFI_RUNTIME_MAP
>  
>  	  See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
>  
> +config SECURE_LAUNCH
> +	bool "Secure Launch support"
> +	depends on X86_64 && X86_X2APIC && TCG_TIS && TCG_CRB && CRYPTO_LIB_SHA1 && CRYPTO_LIB_SHA256

It's normal to select needed library symbols instead of depending on them.
Nothing else in the kernel tree uses depends on for these 2 Kconfig symbols.
(CRYPTO_LIB_SHAxxx)

> +	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.

-- 
~Randy