From patchwork Tue Apr 4 10:26:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13199590 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 65BCFC761AF for ; Tue, 4 Apr 2023 10:54:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234826AbjDDKya (ORCPT ); Tue, 4 Apr 2023 06:54:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39406 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234742AbjDDKxq (ORCPT ); Tue, 4 Apr 2023 06:53:46 -0400 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B947F40EC; Tue, 4 Apr 2023 03:53:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1680605591; x=1712141591; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8lktqN9Ow6nF5dYh+N7FoY+KesvEnknJu52aiBKcpfg=; b=GkHf5rh3kRozkrSpYYL1zDL7+vj3oEtnOAsb/1Sggnhcjk3nTXWv7vyG NfrZJvF6v7AMGoMMCdXrJmkwhUlPRUkOXZiU6KlwAB/hojI4AnrpEqRRe m6poVucgKzau/5F6jEL70nQ/NlDSOrDdKzg6GywYS8inMMRAkJ7d1TIea kcmRaxNBjFXMAqylivHumfUmxnYvZ633cvISxqwwx73zY/lXfSvvIJToR dHMgfhguJQn9VPlMITK44etTnrG0EgMol5JPnXJQG5OL6q+t0GS0Q69jM cxkot8ncm7sAUyF+ZxYf4+YeHrIJXu1uUSw880QybMmhiAhdRq5x3xyDW A==; X-IronPort-AV: E=McAfee;i="6600,9927,10669"; a="330734023" X-IronPort-AV: E=Sophos;i="5.98,317,1673942400"; d="scan'208";a="330734023" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Apr 2023 03:53:02 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10669"; a="775597808" X-IronPort-AV: E=Sophos;i="5.98,317,1673942400"; d="scan'208";a="775597808" Received: from unknown (HELO fred..) ([172.25.112.68]) by FMSMGA003.fm.intel.com with ESMTP; 04 Apr 2023 03:53:02 -0700 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, jiangshanlai@gmail.com, shan.kang@intel.com Subject: [PATCH v7 10/33] x86/fred: add Kconfig option for FRED (CONFIG_X86_FRED) Date: Tue, 4 Apr 2023 03:26:53 -0700 Message-Id: <20230404102716.1795-11-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230404102716.1795-1-xin3.li@intel.com> References: <20230404102716.1795-1-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"