linux-kernel - [PATCH v15 13/28] x86: Secure Launch Kconfig

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Message-ID: <20251215233316.1076248-14-ross.philipson@oracle.com>
Date: Mon, 15 Dec 2025 15:33:01 -0800
From: Ross Philipson <ross.philipson@...cle.com>
To: 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: ross.philipson@...cle.com, 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: [PATCH v15 13/28] x86: Secure Launch Kconfig

Add a Kconfig option for compiling in/out the Secure Launch feature.
Secure Launch is controlled by a singel boolean on/off.

Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
---
 arch/x86/Kconfig | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index fa3b616af03a..9404d207c420 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1975,6 +1975,20 @@ config EFI_RUNTIME_MAP
 
 	  See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
 
+config SECURE_LAUNCH
+	bool "Secure Launch DRTM support"
+	depends on X86_64 && X86_X2APIC && TCG_TIS && TCG_CRB
+	select CRYPTO_LIB_SHA1
+	select CRYPTO_LIB_SHA256
+	help
+	  The Secure Launch feature allows a kernel to be launched directly
+	  through a vendor neutral DTRM (Dynamic Root of Trust for Measurement)
+	  solution, with Intel TXT being one example.  The DRTM establishes an
+	  environment where the CPU measures the kernel image, employing the TPM,
+	  before starting it. Secure Launch then continues the measurement chain
+	  over kernel configuration information and other launch artifacts (e.g.
+	  any initramfs image).
+
 source "kernel/Kconfig.hz"
 
 config ARCH_SUPPORTS_KEXEC
-- 
2.43.7