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=-10.5 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 BCFAAC4338F for ; Wed, 28 Jul 2021 15:29:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A351960F91 for ; Wed, 28 Jul 2021 15:29:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237312AbhG1P3x (ORCPT ); Wed, 28 Jul 2021 11:29:53 -0400 Received: from mga07.intel.com ([134.134.136.100]:19023 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237292AbhG1P3v (ORCPT ); Wed, 28 Jul 2021 11:29:51 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10059"; a="276471631" X-IronPort-AV: E=Sophos;i="5.84,276,1620716400"; d="scan'208";a="276471631" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jul 2021 08:29:46 -0700 X-IronPort-AV: E=Sophos;i="5.84,276,1620716400"; d="scan'208";a="517575500" Received: from sobsiex-desk2.amr.corp.intel.com (HELO [10.212.198.197]) ([10.212.198.197]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jul 2021 08:29:43 -0700 Subject: Re: [PATCH 03/13] x86/HV: Add new hvcall guest address host visibility 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, thomas.lendacky@amd.com, brijesh.singh@amd.com, ardb@kernel.org, Tianyu.Lan@microsoft.com, rientjes@google.com, martin.b.radev@gmail.com, akpm@linux-foundation.org, rppt@kernel.org, kirill.shutemov@linux.intel.com, aneesh.kumar@linux.ibm.com, krish.sadhukhan@oracle.com, saravanand@fb.com, xen-devel@lists.xenproject.org, pgonda@google.com, david@redhat.com, keescook@chromium.org, hannes@cmpxchg.org, sfr@canb.auug.org.au, 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, anparri@microsoft.com References: <20210728145232.285861-1-ltykernel@gmail.com> <20210728145232.285861-4-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: <20210728145232.285861-4-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 7/28/21 7:52 AM, Tianyu Lan wrote: > @@ -1986,7 +1988,9 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) > int ret; > > /* Nothing to do if memory encryption is not active */ > - if (!mem_encrypt_active()) > + if (hv_is_isolation_supported()) > + return hv_set_mem_enc(addr, numpages, enc); > + else if (!mem_encrypt_active()) > return 0; __set_memory_enc_dec() is turning into a real mess. SEV, TDX and now Hyper-V are messing around in here. It doesn't help that these additions are totally uncommented. Even worse is that hv_set_mem_enc() was intentionally named "enc" when it presumably has nothing to do with encryption. This needs to be refactored. The current __set_memory_enc_dec() can become __set_memory_enc_pgtable(). It gets used for the hypervisors that get informed about "encryption" status via page tables: SEV and TDX. Then, rename hv_set_mem_enc() to hv_set_visible_hcall(). You'll end up with: int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) { if (hv_is_isolation_supported()) return hv_set_visible_hcall(...); if (mem_encrypt_active() || ...) return __set_memory_enc_pgtable(); /* Nothing to do */ return 0; } That tells the story pretty effectively, in code. > +int hv_set_mem_enc(unsigned long addr, int numpages, bool enc) > +{ > + return hv_set_mem_host_visibility((void *)addr, > + numpages * HV_HYP_PAGE_SIZE, > + enc ? VMBUS_PAGE_NOT_VISIBLE > + : VMBUS_PAGE_VISIBLE_READ_WRITE); > +} I know this is off in Hyper-V code, but this just makes my eyes bleed. I'd much rather see something which is less compact but readable. > +/* Hyper-V GPA map flags */ > +#define VMBUS_PAGE_NOT_VISIBLE 0 > +#define VMBUS_PAGE_VISIBLE_READ_ONLY 1 > +#define VMBUS_PAGE_VISIBLE_READ_WRITE 3 That looks suspiciously like an enum.