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=-10.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 CE51FC4320E for ; Mon, 30 Aug 2021 12:00:56 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (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 29B69611CE for ; Mon, 30 Aug 2021 12:00:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 29B69611CE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id ED3A460785; Mon, 30 Aug 2021 12:00:55 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BTZdsotWfa4y; Mon, 30 Aug 2021 12:00:51 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp3.osuosl.org (Postfix) with ESMTPS id 8E6CD60636; Mon, 30 Aug 2021 12:00:51 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 6AA98C0010; Mon, 30 Aug 2021 12:00:51 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id B3912C000E for ; Mon, 30 Aug 2021 12:00:50 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 95A1A60636 for ; Mon, 30 Aug 2021 12:00:50 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pRDBEzMtY2uR for ; Mon, 30 Aug 2021 12:00:46 +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 smtp3.osuosl.org (Postfix) with ESMTPS id 8838D60785 for ; Mon, 30 Aug 2021 12:00:46 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 25CFD68B05; Mon, 30 Aug 2021 14:00:37 +0200 (CEST) Date: Mon, 30 Aug 2021 14:00:36 +0200 From: Christoph Hellwig To: Tianyu Lan Subject: Re: [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Message-ID: <20210830120036.GA22005@lst.de> References: <20210827172114.414281-1-ltykernel@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210827172114.414281-1-ltykernel@gmail.com> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: parri.andrea@gmail.com, linux-hyperv@vger.kernel.org, brijesh.singh@amd.com, peterz@infradead.org, catalin.marinas@arm.com, dave.hansen@linux.intel.com, dave.hansen@intel.com, netdev@vger.kernel.org, hpa@zytor.com, kys@microsoft.com, will@kernel.org, boris.ostrovsky@oracle.com, linux-arch@vger.kernel.org, wei.liu@kernel.org, sstabellini@kernel.org, sthemmin@microsoft.com, xen-devel@lists.xenproject.org, linux-scsi@vger.kernel.org, aneesh.kumar@linux.ibm.com, x86@kernel.org, decui@microsoft.com, hch@lst.de, michael.h.kelley@microsoft.com, mingo@redhat.com, pgonda@google.com, rientjes@google.com, kuba@kernel.org, jejb@linux.ibm.com, martin.b.radev@gmail.com, thomas.lendacky@amd.com, Tianyu.Lan@microsoft.com, arnd@arndb.de, konrad.wilk@oracle.com, haiyangz@microsoft.com, bp@alien8.de, luto@kernel.org, krish.sadhukhan@oracle.com, tglx@linutronix.de, vkuznets@redhat.com, linux-arm-kernel@lists.infradead.org, jgross@suse.com, martin.petersen@oracle.com, saravanand@fb.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, rppt@kernel.org, hannes@cmpxchg.org, ardb@kernel.org, akpm@linux-foundation.org, robin.murphy@arm.com, davem@davemloft.net, kirill.shutemov@linux.intel.com 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" Sorry for the delayed answer, but I look at the vmap_pfn usage in the previous version and tried to come up with a better version. This mostly untested branch: http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/hyperv-vmap get us there for swiotlb and the channel infrastructure I've started looking at the network driver and didn't get anywhere due to other work. As far as I can tell the network driver does gigantic multi-megabyte vmalloc allocation for the send and receive buffers, which are then passed to the hardware, but always copied to/from when interacting with the networking stack. Did I see that right? Are these big buffers actually required unlike the normal buffer management schemes in other Linux network drivers? If so I suspect the best way to allocate them is by not using vmalloc but just discontiguous pages, and then use kmap_local_pfn where the PFN includes the share_gpa offset when actually copying from/to the skbs. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu