From patchwork Mon Apr 10 08:14:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13206168 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 BE734C77B61 for ; Mon, 10 Apr 2023 08:41:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229503AbjDJIlV (ORCPT ); Mon, 10 Apr 2023 04:41:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229562AbjDJIlH (ORCPT ); Mon, 10 Apr 2023 04:41:07 -0400 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26FEB44BD; Mon, 10 Apr 2023 01:41:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1681116066; x=1712652066; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8lktqN9Ow6nF5dYh+N7FoY+KesvEnknJu52aiBKcpfg=; b=NAJu+B/+tm3SqHHu1LyIZE1pQQX+NbmSuPKQVvrXntNqZN15JOcb0gYp ZflonruSZztjsoxIcc0ivVpr9DlFHfIb7RI2UpPF4yt30Vgl19qTpDI1y mik1MBL+x1PzDdowZDom/RnuZOsNgxRA3WwOCJe36XQRL7U9VZqEexzb8 PrBf5w1kp9GgwlEzYTV+G5SVgtFNz+omXeJU1erTj6gPE5FG8vjbkU/NJ Pihqc+kFy5naBAxMBssxYjX/5lb2A9XQ6xMfkd/gC6zQqwM7lBBfEznmR U9sOBbgXqPcFnQX225HKvnFxGi8FhqTZrJlWuRXvIGvfi/3Jqk6/9xTrM w==; X-IronPort-AV: E=McAfee;i="6600,9927,10675"; a="342077966" X-IronPort-AV: E=Sophos;i="5.98,333,1673942400"; d="scan'208";a="342077966" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Apr 2023 01:41:03 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10675"; a="799436272" X-IronPort-AV: E=Sophos;i="5.98,333,1673942400"; d="scan'208";a="799436272" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga002.fm.intel.com with ESMTP; 10 Apr 2023 01:41:03 -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 v8 10/33] x86/fred: add Kconfig option for FRED (CONFIG_X86_FRED) Date: Mon, 10 Apr 2023 01:14:15 -0700 Message-Id: <20230410081438.1750-11-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230410081438.1750-1-xin3.li@intel.com> References: <20230410081438.1750-1-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"