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=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 44568C433E2 for ; Tue, 15 Sep 2020 22:16:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 04DDC20872 for ; Tue, 15 Sep 2020 22:16:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727792AbgIOWQJ (ORCPT ); Tue, 15 Sep 2020 18:16:09 -0400 Received: from mga01.intel.com ([192.55.52.88]:36700 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727744AbgIOQfr (ORCPT ); Tue, 15 Sep 2020 12:35:47 -0400 IronPort-SDR: jaEA/dyI+62NxHwQfpMhiTz6v/mFUdyZzZAg+uxuatVFFoOxOEAc262PYthoQK5rjAqA36g4on tfzkxg3+uTpg== X-IronPort-AV: E=McAfee;i="6000,8403,9745"; a="177365801" X-IronPort-AV: E=Sophos;i="5.76,430,1592895600"; d="scan'208";a="177365801" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Sep 2020 09:30:20 -0700 IronPort-SDR: l1W3uqA7L09H/CLH5+rbzgfnqzZGSPMjCfnP6yUPxvgMJjZcgBEd9YHBVM+7jvrp0dkZlBu5TA 6mhiq/txtY7w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,430,1592895600"; d="scan'208";a="345909901" Received: from romley-ivt3.sc.intel.com ([172.25.110.60]) by orsmga007.jf.intel.com with ESMTP; 15 Sep 2020 09:30:20 -0700 From: Fenghua Yu To: "Thomas Gleixner" , "Borislav Petkov" , "Ingo Molnar" , "H Peter Anvin" , "Andy Lutomirski" , "Jean-Philippe Brucker" , "Christoph Hellwig" , "Peter Zijlstra" , "David Woodhouse" , "Lu Baolu" , "Dave Hansen" , "Tony Luck" , "Randy Dunlap" , "Ashok Raj" , "Jacob Jun Pan" , "Dave Jiang" , "Sohil Mehta" , "Ravi V Shankar" Cc: "linux-kernel" , "x86" , iommu@lists.linux-foundation.org, Fenghua Yu Subject: [PATCH v8 4/9] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Date: Tue, 15 Sep 2020 09:30:08 -0700 Message-Id: <1600187413-163670-5-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1600187413-163670-1-git-send-email-fenghua.yu@intel.com> References: <1600187413-163670-1-git-send-email-fenghua.yu@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Work submission instruction comes in two flavors. ENQCMD can be called both in ring 3 and ring 0 and always uses the contents of PASID MSR when shipping the command to the device. ENQCMDS allows a kernel driver to submit commands on behalf of a user process. The driver supplies the PASID value in ENQCMDS. There isn't any usage of ENQCMD in the kernel as of now. The CPU feature flag is shown as "enqcmd" in /proc/cpuinfo. Signed-off-by: Fenghua Yu Reviewed-by: Tony Luck --- v2: - Re-write commit message (Thomas) arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/kernel/cpu/cpuid-deps.c | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 2901d5df4366..fea10d04d05f 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -353,6 +353,7 @@ #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 */ +#define X86_FEATURE_ENQCMD (16*32+29) /* ENQCMD and ENQCMDS instructions */ /* AMD-defined CPU features, CPUID level 0x80000007 (EBX), word 17 */ #define X86_FEATURE_OVERFLOW_RECOV (17*32+ 0) /* MCA overflow recovery support */ diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c index 3cbe24ca80ab..3a02707c1f4d 100644 --- a/arch/x86/kernel/cpu/cpuid-deps.c +++ b/arch/x86/kernel/cpu/cpuid-deps.c @@ -69,6 +69,7 @@ static const struct cpuid_dep cpuid_deps[] = { { X86_FEATURE_CQM_MBM_TOTAL, X86_FEATURE_CQM_LLC }, { X86_FEATURE_CQM_MBM_LOCAL, X86_FEATURE_CQM_LLC }, { X86_FEATURE_AVX512_BF16, X86_FEATURE_AVX512VL }, + { X86_FEATURE_ENQCMD, X86_FEATURE_XSAVES }, {} }; -- 2.19.1