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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 B2810C2B9F4 for ; Mon, 14 Jun 2021 15:33:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 82C7661241 for ; Mon, 14 Jun 2021 15:33:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233484AbhFNPfD (ORCPT ); Mon, 14 Jun 2021 11:35:03 -0400 Received: from verein.lst.de ([213.95.11.211]:44969 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233253AbhFNPfB (ORCPT ); Mon, 14 Jun 2021 11:35:01 -0400 Received: by verein.lst.de (Postfix, from userid 2407) id 2740F68AFE; Mon, 14 Jun 2021 17:32:52 +0200 (CEST) Date: Mon, 14 Jun 2021 17:32:52 +0200 From: Christoph Hellwig To: Robin Murphy Cc: Christoph Hellwig , 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, arnd@arndb.de, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, rppt@kernel.org, hannes@cmpxchg.org, cai@lca.pw, krish.sadhukhan@oracle.com, saravanand@fb.com, Tianyu.Lan@microsoft.com, konrad.wilk@oracle.com, m.szyprowski@samsung.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, xen-devel@lists.xenproject.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, 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, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com Subject: Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function Message-ID: <20210614153252.GA1741@lst.de> References: <20210530150628.2063957-1-ltykernel@gmail.com> <20210530150628.2063957-9-ltykernel@gmail.com> <20210607064312.GB24478@lst.de> <94038087-a33c-93c5-27bf-7ec1f6f5f0e3@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <94038087-a33c-93c5-27bf-7ec1f6f5f0e3@arm.com> User-Agent: Mutt/1.5.17 (2007-11-01) Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Mon, Jun 14, 2021 at 02:49:51PM +0100, Robin Murphy wrote: > FWIW, I think a better generalisation for this would be allowing > set_memory_decrypted() to return an address rather than implicitly > operating in-place, and hide all the various hypervisor hooks behind that. Yes, something like that would be a good idea. As-is set_memory_decrypted is a pretty horribly API anyway due to passing the address as void, and taking a size parameter while it works in units of pages. So I'd very much welcome a major overhaul of this API. 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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 3230FC48BE8 for ; Mon, 14 Jun 2021 15:33:04 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B4ABB613D0 for ; Mon, 14 Jun 2021 15:33:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B4ABB613D0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 6CD2B404AF; Mon, 14 Jun 2021 15:33:03 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3ccOtvMhsNX8; Mon, 14 Jun 2021 15:33:02 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTPS id 1279C404A3; Mon, 14 Jun 2021 15:33:02 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id D5B73C000D; Mon, 14 Jun 2021 15:33:01 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 3D13BC000B for ; Mon, 14 Jun 2021 15:33:00 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 2764D82DA1 for ; Mon, 14 Jun 2021 15:33:00 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sx7RVtE6B2nY for ; Mon, 14 Jun 2021 15:32:59 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by smtp1.osuosl.org (Postfix) with ESMTPS id DE64E82D17 for ; Mon, 14 Jun 2021 15:32:58 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 2740F68AFE; Mon, 14 Jun 2021 17:32:52 +0200 (CEST) Date: Mon, 14 Jun 2021 17:32:52 +0200 From: Christoph Hellwig To: Robin Murphy Subject: Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function Message-ID: <20210614153252.GA1741@lst.de> References: <20210530150628.2063957-1-ltykernel@gmail.com> <20210530150628.2063957-9-ltykernel@gmail.com> <20210607064312.GB24478@lst.de> <94038087-a33c-93c5-27bf-7ec1f6f5f0e3@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <94038087-a33c-93c5-27bf-7ec1f6f5f0e3@arm.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: linux-hyperv@vger.kernel.org, brijesh.singh@amd.com, thomas.lendacky@amd.com, peterz@infradead.org, dave.hansen@linux.intel.com, hpa@zytor.com, kys@microsoft.com, will@kernel.org, Christoph Hellwig , linux-arch@vger.kernel.org, wei.liu@kernel.org, sstabellini@kernel.org, sthemmin@microsoft.com, linux-scsi@vger.kernel.org, x86@kernel.org, decui@microsoft.com, Tianyu Lan , mingo@redhat.com, xen-devel@lists.xenproject.org, jejb@linux.ibm.com, jgross@suse.com, Tianyu.Lan@microsoft.com, arnd@arndb.de, konrad.wilk@oracle.com, haiyangz@microsoft.com, kuba@kernel.org, bp@alien8.de, luto@kernel.org, krish.sadhukhan@oracle.com, tglx@linutronix.de, vkuznets@redhat.com, boris.ostrovsky@oracle.com, martin.petersen@oracle.com, saravanand@fb.com, netdev@vger.kernel.org, sunilmut@microsoft.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, kirill.shutemov@linux.intel.com, hannes@cmpxchg.org, cai@lca.pw, akpm@linux-foundation.org, davem@davemloft.net, rppt@kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Mon, Jun 14, 2021 at 02:49:51PM +0100, Robin Murphy wrote: > FWIW, I think a better generalisation for this would be allowing > set_memory_decrypted() to return an address rather than implicitly > operating in-place, and hide all the various hypervisor hooks behind that. Yes, something like that would be a good idea. As-is set_memory_decrypted is a pretty horribly API anyway due to passing the address as void, and taking a size parameter while it works in units of pages. So I'd very much welcome a major overhaul of this API. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu