From patchwork Mon Feb 8 10:54:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Kai" X-Patchwork-Id: 12074947 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 133F7C433E9 for ; Mon, 8 Feb 2021 10:59:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A7A8364E7B for ; Mon, 8 Feb 2021 10:59:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232735AbhBHK5p (ORCPT ); Mon, 8 Feb 2021 05:57:45 -0500 Received: from mga12.intel.com ([192.55.52.136]:12406 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229482AbhBHKzR (ORCPT ); Mon, 8 Feb 2021 05:55:17 -0500 IronPort-SDR: J0bpbQlWSWxl/VDO8hhQt1qHbz/258o6W5t3ue5fUvBRg7HSxKAmEFrrmACdpgs6jEBsEqdlmI rC8gdEM/h6Jw== X-IronPort-AV: E=McAfee;i="6000,8403,9888"; a="160848436" X-IronPort-AV: E=Sophos;i="5.81,161,1610438400"; d="scan'208";a="160848436" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2021 02:54:26 -0800 IronPort-SDR: orGDpGs+hGtjow9s1rUhvWUjBnI+3rAOYL5ZrOH1AIEcI7FSywQoKSB3RU8xEr2sAaNqS2921+ DLR9WESVnuYA== X-IronPort-AV: E=Sophos;i="5.81,161,1610438400"; d="scan'208";a="374450953" Received: from jaeminha-mobl.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.251.11.62]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2021 02:54:23 -0800 From: Kai Huang To: linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, rick.p.edgecombe@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, Kai Huang Subject: [RFC PATCH v4 01/26] x86/cpufeatures: Make SGX_LC feature bit depend on SGX bit Date: Mon, 8 Feb 2021 23:54:05 +1300 Message-Id: <8e6a1963b3666215223c247193e5a3e09a8c3698.1612777752.git.kai.huang@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Move SGX_LC feature bit to CPUID dependency table to make clearing all SGX feature bits easier. Also remove clear_sgx_caps() since it is just a wrapper of setup_clear_cpu_cap(X86_FEATURE_SGX) now. Suggested-by: Sean Christopherson Acked-by: Dave Hansen Acked-by: Jarkko Sakkinen Signed-off-by: Kai Huang --- Hi Jarkko, Dave, I had your Acked-by in v3. Jarkko said this patch should be before the patch which introduced SGX1/SGX2 bit, since it is improvement of existing code, so I switched the order. I assumed I can still have your Acked-by because code change was just due to patch re-ordering. v3->v4: - Changed patch order with the patch that introduced new SGX1/SGX2 bits, since it is improvement of existing code, per Jarkko. --- arch/x86/kernel/cpu/cpuid-deps.c | 1 + arch/x86/kernel/cpu/feat_ctl.c | 12 +++--------- 2 files changed, 4 insertions(+), 9 deletions(-) diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c index 42af31b64c2c..d40f8e0a54ce 100644 --- a/arch/x86/kernel/cpu/cpuid-deps.c +++ b/arch/x86/kernel/cpu/cpuid-deps.c @@ -72,6 +72,7 @@ static const struct cpuid_dep cpuid_deps[] = { { X86_FEATURE_AVX512_FP16, X86_FEATURE_AVX512BW }, { X86_FEATURE_ENQCMD, X86_FEATURE_XSAVES }, { X86_FEATURE_PER_THREAD_MBA, X86_FEATURE_MBA }, + { X86_FEATURE_SGX_LC, X86_FEATURE_SGX }, {} }; diff --git a/arch/x86/kernel/cpu/feat_ctl.c b/arch/x86/kernel/cpu/feat_ctl.c index 3b1b01f2b248..27533a6e04fa 100644 --- a/arch/x86/kernel/cpu/feat_ctl.c +++ b/arch/x86/kernel/cpu/feat_ctl.c @@ -93,15 +93,9 @@ static void init_vmx_capabilities(struct cpuinfo_x86 *c) } #endif /* CONFIG_X86_VMX_FEATURE_NAMES */ -static void clear_sgx_caps(void) -{ - setup_clear_cpu_cap(X86_FEATURE_SGX); - setup_clear_cpu_cap(X86_FEATURE_SGX_LC); -} - static int __init nosgx(char *str) { - clear_sgx_caps(); + setup_clear_cpu_cap(X86_FEATURE_SGX); return 0; } @@ -116,7 +110,7 @@ void init_ia32_feat_ctl(struct cpuinfo_x86 *c) if (rdmsrl_safe(MSR_IA32_FEAT_CTL, &msr)) { clear_cpu_cap(c, X86_FEATURE_VMX); - clear_sgx_caps(); + clear_cpu_cap(c, X86_FEATURE_SGX); return; } @@ -177,6 +171,6 @@ void init_ia32_feat_ctl(struct cpuinfo_x86 *c) !(msr & FEAT_CTL_SGX_LC_ENABLED) || !enable_sgx) { if (enable_sgx) pr_err_once("SGX disabled by BIOS\n"); - clear_sgx_caps(); + clear_cpu_cap(c, X86_FEATURE_SGX); } }