linux-kernel - [PATCH v9 02/11] x86/tdx: Introduce INTEL_TDX

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Message-Id: <20211008234009.1211215-3-sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Fri,  8 Oct 2021 16:40:00 -0700
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        VMware Inc <pv-drivers@...are.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     Peter H Anvin <hpa@...or.com>, Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v9 02/11] x86/tdx: Introduce INTEL_TDX_GUEST config option

Add INTEL_TDX_GUEST config option to selectively compile
TDX guest support.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Reviewed-by: Tony Luck <tony.luck@...el.com>
---

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