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=-10.0 required=3.0 tests=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 DE9CDC433E4 for ; Tue, 30 Jun 2020 23:45:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C4DEB207F5 for ; Tue, 30 Jun 2020 23:45:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726900AbgF3Xp2 (ORCPT ); Tue, 30 Jun 2020 19:45:28 -0400 Received: from mga04.intel.com ([192.55.52.120]:13136 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726831AbgF3XpY (ORCPT ); Tue, 30 Jun 2020 19:45:24 -0400 IronPort-SDR: JTfjGz4fulb40Et6Tx4U+hLlUTtXu6FFM90tB9qOuwaATtZgXt8oCaciMISouPf1PkvKlsRFha 2xeGT/M3cQCg== X-IronPort-AV: E=McAfee;i="6000,8403,9668"; a="143893341" X-IronPort-AV: E=Sophos;i="5.75,298,1589266800"; d="scan'208";a="143893341" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jun 2020 16:45:18 -0700 IronPort-SDR: sBPg/x51XheiiJkW0J18VBwx778SE6D8ORDP3myyOukCW/6Ivohb04DF2RASYKXlCaViNwZncw 6kTkaQH5bQrg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,298,1589266800"; d="scan'208";a="386842560" Received: from romley-ivt3.sc.intel.com ([172.25.110.60]) by fmsmga001.fm.intel.com with ESMTP; 30 Jun 2020 16:44:52 -0700 From: Fenghua Yu To: "Thomas Gleixner" , "Joerg Roedel" , "Ingo Molnar" , "Borislav Petkov" , "Peter Zijlstra" , "H Peter Anvin" , "David Woodhouse" , "Lu Baolu" , "Felix Kuehling" , "Dave Hansen" , "Tony Luck" , "Jean-Philippe Brucker" , "Christoph Hellwig" , "Ashok Raj" , "Jacob Jun Pan" , "Dave Jiang" , "Sohil Mehta" , "Ravi V Shankar" Cc: "linux-kernel" , "x86" , iommu@lists.linux-foundation.org, "amd-gfx" , Fenghua Yu Subject: [PATCH v5 04/12] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Date: Tue, 30 Jun 2020 16:44:34 -0700 Message-Id: <1593560682-40814-5-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1593560682-40814-1-git-send-email-fenghua.yu@intel.com> References: <1593560682-40814-1-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 02dabc9e77b0..4469618c410f 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -351,6 +351,7 @@ #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