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=-10.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 C587DC4320E for ; Wed, 4 Aug 2021 19:27:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B022460F58 for ; Wed, 4 Aug 2021 19:27:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240680AbhHDT1k (ORCPT ); Wed, 4 Aug 2021 15:27:40 -0400 Received: from mga01.intel.com ([192.55.52.88]:42490 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237768AbhHDT1g (ORCPT ); Wed, 4 Aug 2021 15:27:36 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10066"; a="235953155" X-IronPort-AV: E=Sophos;i="5.84,295,1620716400"; d="scan'208";a="235953155" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 12:27:22 -0700 X-IronPort-AV: E=Sophos;i="5.84,295,1620716400"; d="scan'208";a="671072064" Received: from cmalmber-mobl1.amr.corp.intel.com (HELO [10.212.219.120]) ([10.212.219.120]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2021 12:27:18 -0700 Subject: Re: [PATCH V2 03/14] x86/set_memory: Add x86_set_memory_enc static call support To: Tianyu Lan , kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu.Lan@microsoft.com, rppt@kernel.org, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, pgonda@google.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, martin.b.radev@gmail.com, ardb@kernel.org, rientjes@google.com, tj@kernel.org, keescook@chromium.org, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, parri.andrea@gmail.com References: <20210804184513.512888-1-ltykernel@gmail.com> <20210804184513.512888-4-ltykernel@gmail.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: <20210804184513.512888-4-ltykernel@gmail.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 8/4/21 11:44 AM, Tianyu Lan wrote: > +static int default_set_memory_enc(unsigned long addr, int numpages, bool enc); > +DEFINE_STATIC_CALL(x86_set_memory_enc, default_set_memory_enc); > + > #define CPA_FLUSHTLB 1 > #define CPA_ARRAY 2 > #define CPA_PAGES_ARRAY 4 > @@ -1981,6 +1985,11 @@ int set_memory_global(unsigned long addr, int numpages) > } > > static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) > +{ > + return static_call(x86_set_memory_enc)(addr, numpages, enc); > +} > + > +static int default_set_memory_enc(unsigned long addr, int numpages, bool enc) > { > struct cpa_data cpa; > int ret; It doesn't make a lot of difference to add this infrastructure and then ignore it for the existing in-tree user: > static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) > { > struct cpa_data cpa; > int ret; > > /* Nothing to do if memory encryption is not active */ > if (!mem_encrypt_active()) > return 0; Shouldn't the default be to just "return 0"? Then on mem_encrypt_active() systems, do the bulk of what is in __set_memory_enc_dec() today.