From patchwork Mon Jul 31 06:32:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13333763 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 0D3A4C001DF for ; Mon, 31 Jul 2023 07:04:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230455AbjGaHES (ORCPT ); Mon, 31 Jul 2023 03:04:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231221AbjGaHDv (ORCPT ); Mon, 31 Jul 2023 03:03:51 -0400 Received: from mgamail.intel.com (unknown [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6699B1BDF; Mon, 31 Jul 2023 00:02:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1690786948; x=1722322948; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=1h9fTPNcW28O8bu/nclSFH4GxPR5CW0Rl9/PbASKNuY=; b=QxWDADlZ9vCgE4aVAKNS/AeTeBChHMPRiv2UfhInUOBOBiZRn9VcrOxU NHOLWKuWC0OTEMbis8lTw1C/lC80oHjsZEWMp8e7mJsyzpezjU8G9isfG OORGn5H11MMLUE9v8uxtzjOXWmwFV3mr2fuoDG6db6cD6ErgasS1Ts56/ qD9BebHbfTWG1/dANuykxcrK/9ujx5szNraRUeYuKB6lOplGjwItjInP7 btstGsDPnCwGSS+wdMbCkn1cVeP6Lf/De6ZVyyA/GGrXSE282riN/ndDr L1J54GrEjgTaQqvl2lRLkMmlDOWv0bCxGOg+fGxTunwjzjCFANWCIYWEY Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10787"; a="371649178" X-IronPort-AV: E=Sophos;i="6.01,244,1684825200"; d="scan'208";a="371649178" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jul 2023 00:02:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.01,202,1684825200"; d="scan'208";a="871543443" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga001.fm.intel.com with ESMTP; 31 Jul 2023 00:02:07 -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: Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Andy Lutomirski , Oleg Nesterov , Tony Luck , "K . Y . Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Sean Christopherson , Peter Zijlstra , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Josh Poimboeuf , "Paul E . McKenney" , Catalin Marinas , Randy Dunlap , Steven Rostedt , Kim Phillips , Xin Li , Hyeonggon Yoo <42.hyeyoo@gmail.com>, "Liam R . Howlett" , Sebastian Reichel , "Kirill A . Shutemov" , Suren Baghdasaryan , Pawan Gupta , Jiaxi Chen , Babu Moger , Jim Mattson , Sandipan Das , Lai Jiangshan , Hans de Goede , Reinette Chatre , Daniel Sneddon , Breno Leitao , Nikunj A Dadhania , Brian Gerst , Sami Tolvanen , Alexander Potapenko , Andrew Morton , Arnd Bergmann , "Eric W . Biederman" , Kees Cook , Masami Hiramatsu , Masahiro Yamada , Ze Gao , Fei Li , Conghui , Ashok Raj , "Jason A . Donenfeld" , Mark Rutland , Jacob Pan , Jiapeng Chong , Jane Malalane , David Woodhouse , Boris Ostrovsky , Arnaldo Carvalho de Melo , Yantengsi , Christophe Leroy , Sathvika Vasireddy Subject: [PATCH v9 17/36] x86/fred: Define a common function type fred_handler Date: Sun, 30 Jul 2023 23:32:58 -0700 Message-Id: <20230731063317.3720-18-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230731063317.3720-1-xin3.li@intel.com> References: <20230731063317.3720-1-xin3.li@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-edac@vger.kernel.org FRED event delivery establishes a full supervisor context by saving the essential information about an event to a FRED stack frame, e.g., the faulting linear address of a #PF is saved as event data of a FRED stack frame. Thus a struct pt_regs has all the needed data to handle an event and it's the only input argument of a FRED event handler. Define fred_handler, a common function type used in the FRED event dispatch framework, which makes it easier to find the entry points (via grep), allows the prototype to change if necessary without requiring changing changes everywhere, and makes sure that all the entry points have the proper decorations (currently noinstr, but could change in the future.) Signed-off-by: Xin Li --- arch/x86/include/asm/fred.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/x86/include/asm/fred.h b/arch/x86/include/asm/fred.h index d76e681a806f..b45c1bea5b7f 100644 --- a/arch/x86/include/asm/fred.h +++ b/arch/x86/include/asm/fred.h @@ -68,6 +68,19 @@ #define FRED_SSX_64_BIT_MODE_BIT 57 #define FRED_SSX_64_BIT_MODE _BITUL(FRED_SSX_64_BIT_MODE_BIT) +/* + * FRED event delivery establishes a full supervisor context by + * saving the essential information about an event to a FRED + * stack frame, e.g., the faulting linear address of a #PF is + * saved as event data of a FRED #PF stack frame. Thus a struct + * pt_regs has all the needed data to handle an event and it's + * the only input argument of a FRED event handler. + * + * FRED handlers need to be placed in the noinstr text section. + */ +#define DECLARE_FRED_HANDLER(f) void f (struct pt_regs *regs) +#define DEFINE_FRED_HANDLER(f) noinstr DECLARE_FRED_HANDLER(f) + #ifdef CONFIG_X86_FRED #ifndef __ASSEMBLY__ @@ -97,6 +110,8 @@ static __always_inline unsigned long fred_event_data(struct pt_regs *regs) return fred_info(regs)->edata; } +typedef DECLARE_FRED_HANDLER((*fred_handler)); + #endif /* __ASSEMBLY__ */ #endif /* CONFIG_X86_FRED */