linux-kernel - Re: [PATCH v14 02/19] x86: Secure Launch Kconfig

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Message-ID: <e1e3dc8f-ca16-4cce-a670-bb8ef566213d@infradead.org>
Date: Mon, 21 Apr 2025 10:41:27 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Ross Philipson <ross.philipson@...cle.com>, 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, iommu@...ts.linux.dev
Cc: dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
 bp@...en8.de, hpa@...or.com, dave.hansen@...ux.intel.com, ardb@...nel.org,
 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,
 corbet@....net, ebiederm@...ssion.com, dwmw2@...radead.org,
 baolu.lu@...ux.intel.com, kanth.ghatraju@...cle.com,
 andrew.cooper3@...rix.com, trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v14 02/19] x86: Secure Launch Kconfig

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