[PATCH v10 02/11] x86/tdx: Introduce INTEL_TDX_GUEST config option

[Kuppuswamy Sathyanarayanan]

Add INTEL_TDX_GUEST config option to selectively compile
TDX guest support.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
---

Changes since v9:
 * None.

Changes since v8:
 * Used Extensions in place of eXtensions to maintain uniformity.
 * Removed "select SECURITY_LOCKDOWN_LSM" (it is no longer needed).
 * Replaced "select X86_X2APIC" with "depends X86_X2APIC".

Changes since v7:
 * None

Changes since v6:
 * None

Changes since v5:
 * None

Changes since v4:
 * None

Changes since v3:
 * Removed PARAVIRT_XL from dependency list.
 * Fixed typo in help content.

 arch/x86/Kconfig | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2b2a9639d8ae..eab7f2911f94 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -865,6 +865,20 @@ config ACRN_GUEST
 	  IOT with small footprint and real-time features. More details can be
 	  found in https://projectacrn.org/.
 
+config INTEL_TDX_GUEST
+	bool "Intel Trusted Domain Extensions (TDX) Guest Support"
+	depends on X86_64 && CPU_SUP_INTEL && PARAVIRT
+	depends on SECURITY
+	depends on X86_X2APIC
+	help
+	  Provide support for running in a trusted domain on Intel processors
+	  equipped with Trusted Domain Extensions. TDX is a Intel technology
+	  that extends VMX and Memory Encryption with a new kind of virtual
+	  machine guest called Trust Domain (TD). A TD is designed to run in
+	  a CPU mode that protects the confidentiality of TD memory contents
+	  and the TD’s CPU state from other software, including VMM. TDX guest
+	  uses virtual X2APIC for interrupt management.
+
 endif #HYPERVISOR_GUEST
 
 source "arch/x86/Kconfig.cpu"
-- 
2.25.1