linux-kernel - [PATCH v4 05/14] x86: Secure Launch Kconfig

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Date:   Fri, 27 Aug 2021 09:28:28 -0400
From:   Ross Philipson <ross.philipson@...cle.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        iommu@...ts.linux-foundation.org, linux-integrity@...r.kernel.org,
        linux-doc@...r.kernel.org
Cc:     ross.philipson@...cle.com, dpsmith@...rtussolutions.com,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        luto@...capital.net, kanth.ghatraju@...cle.com,
        trenchboot-devel@...glegroups.com
Subject: [PATCH v4 05/14] x86: Secure Launch Kconfig

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 | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 88fb922..b5e25c5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1949,6 +1949,38 @@ config EFI_MIXED
 
 	   If unsure, say N.
 
+config SECURE_LAUNCH
+	bool "Secure Launch support"
+	default n
+	depends on X86_64 && X86_X2APIC
+	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.
+
+config SECURE_LAUNCH_ALT_PCR19
+	bool "Secure Launch Alternate PCR 19 usage"
+	default n
+	depends on SECURE_LAUNCH
+	help
+	   In the post ACM environment, Secure Launch by default measures
+	   configuration information into PCR18. This feature allows finer
+	   control over measurements by moving configuration measurements
+	   into PCR19.
+
+config SECURE_LAUNCH_ALT_PCR20
+	bool "Secure Launch Alternate PCR 20 usage"
+	default n
+	depends on SECURE_LAUNCH
+	help
+	   In the post ACM environment, Secure Launch by default measures
+	   image data like any external initrd into PCR17. This feature
+	   allows finer control over measurements by moving image measurements
+	   into PCR20.
+
 source "kernel/Kconfig.hz"
 
 config KEXEC
-- 
1.8.3.1