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 7EAF5C677F1 for ; Fri, 24 Feb 2023 07:28:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229618AbjBXH2b (ORCPT ); Fri, 24 Feb 2023 02:28:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40610 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229813AbjBXH2E (ORCPT ); Fri, 24 Feb 2023 02:28:04 -0500 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 391EC3645D; Thu, 23 Feb 2023 23:28:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1677223680; x=1708759680; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=6QHPRwIE+z7Ui/OjlYLx1iEgisWIGhf7tIyqWsGywtA=; b=efReIt8PnRFBlQAJYL6d92TBIB8Bjkk+RTq6qYDgQYvn2dem5csZP2IB WX+J3o160kZ/30Yeuh20iN7Wzn0Nn3pEbvF4B6Evq0NVZbndX6b/+Fp/D 9D8oltpXJAckmEDwBU90+fzx7uUnWC3CELgIGQPo3qyxmtd7qs+G13BhJ p2kghDwSXpM1iQ/p4zU+IxVb/gQ+OzHjzwIf9KrVenSMtHPWokyfkc9gB S9tUFE1nDsKySCzrew3hkWqI41VsYrr89NlvM+y88vfbYbR4ewMMxu9Pi t5VMgxYSM0DCDx5gsKuXT3gHZXHTq8/L43ilO5snUnyARwchI/tSNJ3P8 A==; X-IronPort-AV: E=McAfee;i="6500,9779,10630"; a="334835992" X-IronPort-AV: E=Sophos;i="5.97,324,1669104000"; d="scan'208";a="334835992" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Feb 2023 23:27:22 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10630"; a="815639216" X-IronPort-AV: E=Sophos;i="5.97,324,1669104000"; d="scan'208";a="815639216" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga001.fm.intel.com with ESMTP; 23 Feb 2023 23:27:21 -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: [RFC PATCH v3 10/32] x86/fred: add Kconfig option for FRED (CONFIG_X86_FRED) Date: Thu, 23 Feb 2023 23:01:23 -0800 Message-Id: <20230224070145.3572-11-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230224070145.3572-1-xin3.li@intel.com> References: <20230224070145.3572-1-xin3.li@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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) 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" -- 2.34.1