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Thu, 2 Sep 2021 07:51:41 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4DHkyytv0M7u for ; Thu, 2 Sep 2021 07:51:40 +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 smtp2.osuosl.org (Postfix) with ESMTPS id 1A2E740004 for ; Thu, 2 Sep 2021 07:51:39 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id A78796736F; Thu, 2 Sep 2021 09:51:31 +0200 (CEST) Date: Thu, 2 Sep 2021 09:51:31 +0200 From: Christoph Hellwig To: Tianyu Lan Subject: Re: [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Message-ID: <20210902075131.GA14986@lst.de> References: <20210827172114.414281-1-ltykernel@gmail.com> <20210830120036.GA22005@lst.de> <91b5e997-8d44-77f0-6519-f574b541ba9f@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <91b5e997-8d44-77f0-6519-f574b541ba9f@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, tglx@linutronix.de, 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, Christoph Hellwig , 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, boris.ostrovsky@oracle.com, 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" On Tue, Aug 31, 2021 at 11:20:06PM +0800, Tianyu Lan wrote: >> 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. >> > When netvsc needs to copy packet data to send buffer, it needs to caculate > position with section_index and send_section_size. > Please seee netvsc_copy_to_send_buf() detail. So the contiguous virtual > address of send buffer is necessary to copy data and batch packets. Actually that makes the kmap approach much easier. The phys_to_virt can just be replaced with a kmap_local_pfn and the unmap needs to be added. I've been mostly focussing on the receive path, which would need a similar treatment. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu