From patchwork Wed Dec 16 17:41:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chang S. Bae" X-Patchwork-Id: 11978147 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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=unavailable 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 A8C46C0018C for ; Wed, 16 Dec 2020 17:47:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D6CB24CEE for ; Wed, 16 Dec 2020 17:47:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727913AbgLPRqv (ORCPT ); Wed, 16 Dec 2020 12:46:51 -0500 Received: from mga11.intel.com ([192.55.52.93]:21277 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727910AbgLPRqv (ORCPT ); Wed, 16 Dec 2020 12:46:51 -0500 IronPort-SDR: FHCNSNE+EbSxvLK81ZjDgvPD40DAJBsx3JcAA/ak3+AGx6Bl37qNo0r2Me1uuPNUdg+3WTolAI XkXZyl1dlKQA== X-IronPort-AV: E=McAfee;i="6000,8403,9837"; a="171593386" X-IronPort-AV: E=Sophos;i="5.78,424,1599548400"; d="scan'208";a="171593386" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Dec 2020 09:46:08 -0800 IronPort-SDR: vc/gIUBXwr+CriwiA/LGCx4DIQieb5+v7dbpC2fRljcRg+wxfdMrtM8XuvCifKgpZLYhKgqEuM MfVCquXvf66A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.78,424,1599548400"; d="scan'208";a="391854176" Received: from chang-linux-3.sc.intel.com ([172.25.66.175]) by FMSMGA003.fm.intel.com with ESMTP; 16 Dec 2020 09:46:08 -0800 From: "Chang S. Bae" To: tglx@linutronix.de, mingo@kernel.org, bp@suse.de, luto@kernel.org, x86@kernel.org, herbert@gondor.apana.org.au Cc: dan.j.williams@intel.com, dave.hansen@intel.com, ravi.v.shankar@intel.com, ning.sun@intel.com, kumar.n.dwarakanath@intel.com, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, chang.seok.bae@intel.com Subject: [RFC PATCH 1/8] x86/cpufeature: Enumerate Key Locker feature Date: Wed, 16 Dec 2020 09:41:39 -0800 Message-Id: <20201216174146.10446-2-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201216174146.10446-1-chang.seok.bae@intel.com> References: <20201216174146.10446-1-chang.seok.bae@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Intel's Key Locker is a new security feature providing a mechanism to protect a data encryption key when processing the Advanced Encryption Standard algorithm. Here we add it to the kernel/user ABI by enumerating the hardware capability. E.g., /proc/cpuinfo: keylocker. Also, define the feature-specific CPUID leaf and bits for the feature enablement. Key Locker is on the disabled list, which is useful for compile-time configuration later. Signed-off-by: Chang S. Bae Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org --- arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/disabled-features.h | 8 +++++++- arch/x86/include/asm/keylocker.h | 18 ++++++++++++++++++ arch/x86/include/uapi/asm/processor-flags.h | 2 ++ arch/x86/kernel/cpu/cpuid-deps.c | 1 + 5 files changed, 29 insertions(+), 1 deletion(-) create mode 100644 arch/x86/include/asm/keylocker.h diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index dad350d42ecf..8f2f050023b7 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -352,6 +352,7 @@ #define X86_FEATURE_AVX512_VPOPCNTDQ (16*32+14) /* POPCNT for vectors of DW/QW */ #define X86_FEATURE_LA57 (16*32+16) /* 5-level page tables */ #define X86_FEATURE_RDPID (16*32+22) /* RDPID instruction */ +#define X86_FEATURE_KEYLOCKER (16*32+23) /* Key Locker */ #define X86_FEATURE_CLDEMOTE (16*32+25) /* CLDEMOTE instruction */ #define X86_FEATURE_MOVDIRI (16*32+27) /* MOVDIRI instruction */ #define X86_FEATURE_MOVDIR64B (16*32+28) /* MOVDIR64B instruction */ diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h index 5861d34f9771..0ac9414da242 100644 --- a/arch/x86/include/asm/disabled-features.h +++ b/arch/x86/include/asm/disabled-features.h @@ -44,6 +44,12 @@ # define DISABLE_OSPKE (1<<(X86_FEATURE_OSPKE & 31)) #endif /* CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS */ +#ifdef CONFIG_X86_KEYLOCKER +# define DISABLE_KEYLOCKER 0 +#else +# define DISABLE_KEYLOCKER (1<<(X86_FEATURE_KEYLOCKER & 31)) +#endif /* CONFIG_X86_KEYLOCKER */ + #ifdef CONFIG_X86_5LEVEL # define DISABLE_LA57 0 #else @@ -82,7 +88,7 @@ #define DISABLED_MASK14 0 #define DISABLED_MASK15 0 #define DISABLED_MASK16 (DISABLE_PKU|DISABLE_OSPKE|DISABLE_LA57|DISABLE_UMIP| \ - DISABLE_ENQCMD) + DISABLE_ENQCMD|DISABLE_KEYLOCKER) #define DISABLED_MASK17 0 #define DISABLED_MASK18 0 #define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 19) diff --git a/arch/x86/include/asm/keylocker.h b/arch/x86/include/asm/keylocker.h new file mode 100644 index 000000000000..2fe13c21c63f --- /dev/null +++ b/arch/x86/include/asm/keylocker.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef _ASM_KEYLOCKER_H +#define _ASM_KEYLOCKER_H + +#ifndef __ASSEMBLY__ + +#include + +#define KEYLOCKER_CPUID 0x019 +#define KEYLOCKER_CPUID_EAX_SUPERVISOR BIT(0) +#define KEYLOCKER_CPUID_EBX_AESKLE BIT(0) +#define KEYLOCKER_CPUID_EBX_WIDE BIT(2) +#define KEYLOCKER_CPUID_EBX_BACKUP BIT(4) +#define KEYLOCKER_CPUID_ECX_RAND BIT(1) + +#endif /*__ASSEMBLY__ */ +#endif /* _ASM_KEYLOCKER_H */ diff --git a/arch/x86/include/uapi/asm/processor-flags.h b/arch/x86/include/uapi/asm/processor-flags.h index bcba3c643e63..b958a95a0908 100644 --- a/arch/x86/include/uapi/asm/processor-flags.h +++ b/arch/x86/include/uapi/asm/processor-flags.h @@ -124,6 +124,8 @@ #define X86_CR4_PCIDE _BITUL(X86_CR4_PCIDE_BIT) #define X86_CR4_OSXSAVE_BIT 18 /* enable xsave and xrestore */ #define X86_CR4_OSXSAVE _BITUL(X86_CR4_OSXSAVE_BIT) +#define X86_CR4_KEYLOCKER_BIT 19 /* enable Key Locker */ +#define X86_CR4_KEYLOCKER _BITUL(X86_CR4_KEYLOCKER_BIT) #define X86_CR4_SMEP_BIT 20 /* enable SMEP support */ #define X86_CR4_SMEP _BITUL(X86_CR4_SMEP_BIT) #define X86_CR4_SMAP_BIT 21 /* enable SMAP support */ diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c index d502241995a3..b8edcb91fe4f 100644 --- a/arch/x86/kernel/cpu/cpuid-deps.c +++ b/arch/x86/kernel/cpu/cpuid-deps.c @@ -71,6 +71,7 @@ static const struct cpuid_dep cpuid_deps[] = { { X86_FEATURE_AVX512_BF16, X86_FEATURE_AVX512VL }, { X86_FEATURE_ENQCMD, X86_FEATURE_XSAVES }, { X86_FEATURE_PER_THREAD_MBA, X86_FEATURE_MBA }, + { X86_FEATURE_KEYLOCKER, X86_FEATURE_XMM2 }, {} };