From patchwork Tue Mar 7 02:39:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13162686 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DAF7CC61DA4 for ; Tue, 7 Mar 2023 03:05:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230310AbjCGDFv (ORCPT ); Mon, 6 Mar 2023 22:05:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230210AbjCGDF2 (ORCPT ); Mon, 6 Mar 2023 22:05:28 -0500 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 51BA278CAF; Mon, 6 Mar 2023 19:05:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678158325; x=1709694325; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8lktqN9Ow6nF5dYh+N7FoY+KesvEnknJu52aiBKcpfg=; b=ewelpOh7+t3F74UDTx8YAnXVH0e0i158mPgmyEq/bLj1D0w63TS9flTu JjL7JACyYt/CJbQzcpgmZ1zT0Eup/bsyjpFJnKS0ifocIFuctLDjf7RMj 3bva5PR99ebalag9SqJ/ChES4wjo99X3nRl8jNpC6Q2i7n75YAT4xx5lO YgHjielNkyRf5UVKcjSfrnHBWd/vDSJcVkN8LO2StALqND1CNIShSAnte vOdJPG6nVO6spwS6eCy4ie5anVDxDolzpmfMXGMMRaB9PYe4aLaxKKiRR AsQ66uhtiPqm8q9/L3f28Xutm7JnMRxOdq2GMVim4jbx2QGfxXtVetGGN g==; X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="338072401" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="338072401" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Mar 2023 19:05:14 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="676409783" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="676409783" Received: from unknown (HELO fred..) ([172.25.112.68]) by orsmga002.jf.intel.com with ESMTP; 06 Mar 2023 19:05:13 -0800 From: Xin Li To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org, andrew.cooper3@citrix.com, seanjc@google.com, pbonzini@redhat.com, ravi.v.shankar@intel.com Subject: [PATCH v5 10/34] x86/fred: add Kconfig option for FRED (CONFIG_X86_FRED) Date: Mon, 6 Mar 2023 18:39:22 -0800 Message-Id: <20230307023946.14516-11-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230307023946.14516-1-xin3.li@intel.com> References: <20230307023946.14516-1-xin3.li@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: "H. Peter Anvin (Intel)" Add the configuration option CONFIG_X86_FRED to enable FRED. Signed-off-by: H. Peter Anvin (Intel) Tested-by: Shan Kang Signed-off-by: Xin Li --- arch/x86/Kconfig | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index a825bf031f49..da62178bb246 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -500,6 +500,15 @@ config X86_CPU_RESCTRL Say N if unsure. +config X86_FRED + bool "Flexible Return and Event Delivery" + depends on X86_64 + help + When enabled, try to use Flexible Return and Event Delivery + instead of the legacy SYSCALL/SYSENTER/IDT architecture for + ring transitions and exception/interrupt handling if the + system supports. + if X86_32 config X86_BIGSMP bool "Support for big SMP systems with more than 8 CPUs"