[RFC v2 02/32] 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>
---
 arch/x86/Kconfig | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6b4b682af468..932e6d759ba7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -875,6 +875,21 @@ 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 Guest Support"
+	depends on X86_64 && CPU_SUP_INTEL && PARAVIRT
+	depends on SECURITY
+	select PARAVIRT_XL
+	select X86_X2APIC
+	select SECURITY_LOCKDOWN_LSM
+	help
+	  Provide support for running in a trusted domain on Intel processors
+	  equipped with Trusted Domain eXtenstions. TDX is an new 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.
+
 endif #HYPERVISOR_GUEST
 
 source "arch/x86/Kconfig.cpu"
-- 
2.25.1