From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C7B4C4320A for ; Wed, 4 Aug 2021 18:14:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 82E0C60F35 for ; Wed, 4 Aug 2021 18:14:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240120AbhHDSPD (ORCPT ); Wed, 4 Aug 2021 14:15:03 -0400 Received: from mga02.intel.com ([134.134.136.20]:49808 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240091AbhHDSO7 (ORCPT ); Wed, 4 Aug 2021 14:14:59 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10066"; a="201151088" X-IronPort-AV: E=Sophos;i="5.84,295,1620716400"; d="scan'208";a="201151088" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 11:14:46 -0700 X-IronPort-AV: E=Sophos;i="5.84,295,1620716400"; d="scan'208";a="503075823" Received: from mjkendri-mobl.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.254.17.117]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 11:14:46 -0700 From: Kuppuswamy Sathyanarayanan To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Peter Zijlstra , Andy Lutomirski Cc: Peter H Anvin , Dave Hansen , Tony Luck , Dan Williams , Andi Kleen , Kirill Shutemov , Sean Christopherson , Kuppuswamy Sathyanarayanan , x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 03/12] x86/cpufeatures: Add TDX Guest CPU feature Date: Wed, 4 Aug 2021 11:13:20 -0700 Message-Id: <20210804181329.2899708-4-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210804181329.2899708-1-sathyanarayanan.kuppuswamy@linux.intel.com> References: <20210804181329.2899708-1-sathyanarayanan.kuppuswamy@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add CPU feature detection for Trusted Domain Extensions support. TDX feature adds capabilities to keep guest register state and memory isolated from hypervisor. For TDX guest platforms, executing CPUID(eax=0x21, ecx=0) will return following values in EAX, EBX, ECX and EDX. EAX: Maximum sub-leaf number: 0 EBX/EDX/ECX: Vendor string: EBX = "Inte" EDX = "lTDX" ECX = " " So when above condition is true, set X86_FEATURE_TDX_GUEST feature cap bit. Signed-off-by: Kuppuswamy Sathyanarayanan --- Changes since v4: * Moved tdx_early_init() below copy_bootdata() because of cmdline and IDT dependencies. Changes since v3: * Fixed order of string cpuid_count() call. Changes since v2: * Fixed debug prints as per Borislav suggestion. Changes since v1: * Fixed commit log issues reported by Borislav. * Moved header file include to the start of tdx.h. * Added pr_fmt for TDX. * Simplified cpuid_has_tdx_guest() implementation as per Borislav comments. arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/tdx.h | 20 ++++++++++++++++++++ arch/x86/kernel/Makefile | 1 + arch/x86/kernel/head64.c | 3 +++ arch/x86/kernel/tdx.c | 29 +++++++++++++++++++++++++++++ 5 files changed, 54 insertions(+) create mode 100644 arch/x86/include/asm/tdx.h create mode 100644 arch/x86/kernel/tdx.c diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index d0ce5cfd3ac1..84997abeb401 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -238,6 +238,7 @@ #define X86_FEATURE_VMW_VMMCALL ( 8*32+19) /* "" VMware prefers VMMCALL hypercall instruction */ #define X86_FEATURE_PVUNLOCK ( 8*32+20) /* "" PV unlock function */ #define X86_FEATURE_VCPUPREEMPT ( 8*32+21) /* "" PV vcpu_is_preempted function */ +#define X86_FEATURE_TDX_GUEST ( 8*32+22) /* Trusted Domain Extensions Guest */ /* Intel-defined CPU features, CPUID level 0x00000007:0 (EBX), word 9 */ #define X86_FEATURE_FSGSBASE ( 9*32+ 0) /* RDFSBASE, WRFSBASE, RDGSBASE, WRGSBASE instructions*/ diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h new file mode 100644 index 000000000000..c738bde944d1 --- /dev/null +++ b/arch/x86/include/asm/tdx.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2020 Intel Corporation */ +#ifndef _ASM_X86_TDX_H +#define _ASM_X86_TDX_H + +#include + +#define TDX_CPUID_LEAF_ID 0x21 + +#ifdef CONFIG_INTEL_TDX_GUEST + +void __init tdx_early_init(void); + +#else + +static inline void tdx_early_init(void) { }; + +#endif /* CONFIG_INTEL_TDX_GUEST */ + +#endif /* _ASM_X86_TDX_H */ diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 3e625c61f008..b49110bd50d9 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -127,6 +127,7 @@ obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o obj-$(CONFIG_X86_PMEM_LEGACY_DEVICE) += pmem.o obj-$(CONFIG_JAILHOUSE_GUEST) += jailhouse.o +obj-$(CONFIG_INTEL_TDX_GUEST) += tdx.o obj-$(CONFIG_EISA) += eisa.o obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index de01903c3735..f41f3dac1318 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -40,6 +40,7 @@ #include #include #include +#include /* * Manage page tables very early on. @@ -495,6 +496,8 @@ asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) copy_bootdata(__va(real_mode_data)); + tdx_early_init(); + /* * Load microcode early on BSP. */ diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c new file mode 100644 index 000000000000..39dd1515b131 --- /dev/null +++ b/arch/x86/kernel/tdx.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2020 Intel Corporation */ + +#undef pr_fmt +#define pr_fmt(fmt) "x86/tdx: " fmt + +#include + +static inline bool cpuid_has_tdx_guest(void) +{ + u32 eax, sig[3]; + + if (cpuid_eax(0) < TDX_CPUID_LEAF_ID) + return false; + + cpuid_count(TDX_CPUID_LEAF_ID, 0, &eax, &sig[0], &sig[2], &sig[1]); + + return !memcmp("IntelTDX ", sig, 12); +} + +void __init tdx_early_init(void) +{ + if (!cpuid_has_tdx_guest()) + return; + + setup_force_cpu_cap(X86_FEATURE_TDX_GUEST); + + pr_info("Guest initialized\n"); +} -- 2.25.1