From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE942C433EF for ; Wed, 8 Sep 2021 16:52:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CEFB461157 for ; Wed, 8 Sep 2021 16:52:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352207AbhIHQxT (ORCPT ); Wed, 8 Sep 2021 12:53:19 -0400 Received: from mga07.intel.com ([134.134.136.100]:2633 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350090AbhIHQxQ (ORCPT ); Wed, 8 Sep 2021 12:53:16 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10101"; a="284243498" X-IronPort-AV: E=Sophos;i="5.85,278,1624345200"; d="scan'208";a="284243498" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Sep 2021 09:50:01 -0700 X-IronPort-AV: E=Sophos;i="5.85,278,1624345200"; d="scan'208";a="513327436" Received: from smithrya-mobl.amr.corp.intel.com (HELO [10.209.26.226]) ([10.209.26.226]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Sep 2021 09:50:00 -0700 Subject: Re: [PATCH v4 5/6] x86/sgx: Hook sgx_memory_failure() into mainline code To: "Luck, Tony" , Jarkko Sakkinen , Sean Christopherson Cc: "Zhang, Cathy" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" References: <20210728204653.1509010-1-tony.luck@intel.com> <20210827195543.1667168-1-tony.luck@intel.com> <20210827195543.1667168-6-tony.luck@intel.com> <49fccddbbf92279f575409851a9c682495146ad8.camel@kernel.org> <681d530d72de842c8bf43733c11f3c3f2ebf8c6e.camel@kernel.org> <25db682402d14c34af9ba525cffe85c5@intel.com> <848905ffa20cf234446b16682cbbcf1e56853950.camel@kernel.org> <40da1a9a7d5f41bb9b82ea2cbebce73a@intel.com> <250de8f97efe2458afc39f080c3ef6a55f42623c.camel@kernel.org> <9ee70d2db97c4f719fd23d68741069db@intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <9ee70d2db97c4f719fd23d68741069db@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/7/21 5:59 PM, Luck, Tony wrote: > +#ifdef CONFIG_X86_SGX > +int arch_memory_failure(unsigned long pfn, int flags); > +#define arch_memory_failure arch_memory_failure > + > +bool arch_is_platform_page(u64 paddr); > +#define arch_is_platform_page arch_is_platform_page > +#endif > > and in include/linux/mm.h > > +#ifndef arch_memory_failure > +static inline int arch_memory_failure(unsigned long pfn, int flags) > +{ > + return -ENXIO; > +} > +#endif > +#ifndef arch_is_platform_page > +static inline bool arch_is_platform_page(u64 paddr) > +{ > + return false; > +} > +#endif > > Dave: Is that what you wanted? If so I can fold these bits back into the > appropriate bits of the series. Address other comments. and post v5. Looks good to me. These can *also* be done with a config ARCH_HAS_SPECIAL_MEMORY_FAILURE bool in mm/Kconfig.h, and then: select ARCH_HAS_SPECIAL_MEMORY_FAILURE in the SGX Kconfig instead of the ifndef's. I prefer the configs personally because they are less ambiguous and can't be screwed up my missing #includes or weird #include ordering problems. But, some folks prefer to avoid polluting the CONFIG_* space. That's just pure personal preference though. Either way is fine.