From patchwork Thu Sep 14 04:47:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13384480 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 CE8FFEDE988 for ; Thu, 14 Sep 2023 05:19:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234743AbjINFTZ (ORCPT ); Thu, 14 Sep 2023 01:19:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234835AbjINFTS (ORCPT ); Thu, 14 Sep 2023 01:19:18 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1EF341BCF; Wed, 13 Sep 2023 22:19:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1694668754; x=1726204754; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=AT3+uEfHqtt3VE+RUnzzRXk1GicJbCzWRed9aBLhDUA=; b=Gb9x3hsKaunQ33ajexBci03iLJiWeulngmTVvDEKqqwhNjxxDMYlzD++ jZ+1w0ZpQ9MR9TERjeVBTBK6oXO3/TZXnrwQvDA/0mhrYkd22zm67oMhM q3C24JG9pDo1XzgHp3a67++lN7mOpESQtFrGAcl6ejiJWQ3YOx9iXlfiX ie51tmab696chdWcLXsyJMgPMUaRKYc+NlJ6xD6VQMbOK3eA1LctYuR7/ Tgo1m39VV88dvJCirsDSxzsPv9GcP3C+OmVM5HonqqgkrZJD+Fa2Lcq8h Srek1ROe8I5gQzIG1AsmHCcpdcVGa8rYrCpIhq6KoLwpC9Scw7cjOUzE/ w==; X-IronPort-AV: E=McAfee;i="6600,9927,10832"; a="382661155" X-IronPort-AV: E=Sophos;i="6.02,145,1688454000"; d="scan'208";a="382661155" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Sep 2023 22:17:33 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10832"; a="779488756" X-IronPort-AV: E=Sophos;i="6.02,145,1688454000"; d="scan'208";a="779488756" Received: from unknown (HELO fred..) ([172.25.112.68]) by orsmga001.jf.intel.com with ESMTP; 13 Sep 2023 22:17:32 -0700 From: Xin Li To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, linux-hyperv@vger.kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, luto@kernel.org, pbonzini@redhat.com, seanjc@google.com, peterz@infradead.org, jgross@suse.com, ravi.v.shankar@intel.com, mhiramat@kernel.org, andrew.cooper3@citrix.com, jiangshanlai@gmail.com Subject: [PATCH v10 07/38] x86/fred: Add Kconfig option for FRED (CONFIG_X86_FRED) Date: Wed, 13 Sep 2023 21:47:34 -0700 Message-Id: <20230914044805.301390-8-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230914044805.301390-1-xin3.li@intel.com> References: <20230914044805.301390-1-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 3b3594f96330..cae126417427 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -496,6 +496,15 @@ 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"