From nobody Sat Apr 11 07:07:33 2026 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 98E0CC6FA8E for ; Thu, 2 Mar 2023 05:51:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229963AbjCBFvs (ORCPT ); Thu, 2 Mar 2023 00:51:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45170 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229871AbjCBFvB (ORCPT ); Thu, 2 Mar 2023 00:51:01 -0500 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69A9B4ECD3; Wed, 1 Mar 2023 21:50:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1677736258; x=1709272258; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8lktqN9Ow6nF5dYh+N7FoY+KesvEnknJu52aiBKcpfg=; b=VD5i4SHFmXER1OiNtwS8fTaK5EBZQosPfmgH9x7gEZWU9VTApavPpcID oSXH1jOGbDzkZOoC+pLpzXEAPIq2WcTQjjRFnrVpMdIcpAiBm+b3SvtAj /oE4cW6uRxjE0GgTOStndS8rGORDI89cu2+EoXy6dFHRs5lsAO7VWw++z POsLzrupSf3H/YQ0FVza8/pgbEyA4kGM0AhMbmxnCtpRVrYAwh4jUbC/e JR5iCkHk3nKq+02zhtMDZ+QXRF3mtEDRx/mtg2jox5rR4KAsMkxdTuGpL xp/a95DEkXLmUEOijelb4Ir1Ay9lnMjAyAiS/foxs5B+J2WNbUhw4Ok6A w==; X-IronPort-AV: E=McAfee;i="6500,9779,10636"; a="420887160" X-IronPort-AV: E=Sophos;i="5.98,226,1673942400"; d="scan'208";a="420887160" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Mar 2023 21:50:51 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10636"; a="920530899" X-IronPort-AV: E=Sophos;i="5.98,226,1673942400"; d="scan'208";a="920530899" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga006.fm.intel.com with ESMTP; 01 Mar 2023 21:50:47 -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 v4 10/34] x86/fred: add Kconfig option for FRED (CONFIG_X86_FRED) Date: Wed, 1 Mar 2023 21:24:47 -0800 Message-Id: <20230302052511.1918-11-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230302052511.1918-1-xin3.li@intel.com> References: <20230302052511.1918-1-xin3.li@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 =20 Say N if unsure. =20 +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" --=20 2.34.1