From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qc0-f180.google.com (mail-qc0-f180.google.com [209.85.216.180]) by dpdk.org (Postfix) with ESMTP id 7BCB63F9 for ; Wed, 10 Dec 2014 08:24:12 +0100 (CET) Received: by mail-qc0-f180.google.com with SMTP id i8so1715518qcq.39 for ; Tue, 09 Dec 2014 23:24:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=V067dtmVJ2DoPFl+AVDp1HupjtI5eV7Tf4n49szalxM=; b=XxcwOTU3wyE4+zO7h/+/OpGeZiC0loTMf6PkaNrigB7POcyIa/r8ANhUELLNn82nwJ HT4Zbvh1shs+MOeWMkLnhM+1tSRlZypBitT/1PSKGSQm72F+rHtr08e+T8LAFIxGP8n9 EO6ZGwBAARux/N3LHMmAwDMvron9FZquyX7nbbipJm6pMlS0FhKgEOryu8llpBESKfdt kBYggVMEQJdrfWqaY85T7NFirP0KXSPfWISU4/M/JOnebzn35M7bnFnYKX2Bq0ima/G8 MY/fOyiI7XbFrfZj/MLAc0RAfkfCqJZrDHqQEgeINXePm7lICNJSXAYMcX+hgxGjGAii JILg== MIME-Version: 1.0 X-Received: by 10.140.104.169 with SMTP id a38mr5201844qgf.35.1418196252039; Tue, 09 Dec 2014 23:24:12 -0800 (PST) Received: by 10.229.170.14 with HTTP; Tue, 9 Dec 2014 23:24:11 -0800 (PST) In-Reply-To: <533710CFB86FA344BFBF2D6802E60286C9E62D@SHSMSX101.ccr.corp.intel.com> References: <533710CFB86FA344BFBF2D6802E60286C9E62D@SHSMSX101.ccr.corp.intel.com> Date: Wed, 10 Dec 2014 12:54:11 +0530 Message-ID: From: Aashima Arora To: "Qiu, Michael" Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Cc: dev@dpdk.org Subject: Re: [dpdk-dev] Accessing a Virtual Function Driver in Guest Machine via VFIO X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Dec 2014 07:24:12 -0000 Thanks for your reply. What do you mean "device assignment" ? You mean pass-through? > Yes, the same thing. Pass through of PCI device to VM via qemu (pci-assign, vfio-pci, ivshmem etc) As I knows, the answer is *NO*, because the iommu is not support in guest. > NO was essentially what I was looking for, aware of it now :) On Wed, Dec 10, 2014 at 12:42 PM, Qiu, Michael wrote: > On 12/6/2014 3:01 AM, Aashima Arora wrote: > > Hi, > > I was trying to access the pci config space(BAR) of the virtual function > > device visible in the virtual machine, similar to what DPDK does on host > > via both UIO and VFIO. Did the following steps. > > > > 1. Bound PF Drivers to ixgbe and spawned virtual function drivers , bound > > them to vfio-pci and set their mac addresses via ip link. Ran Qemu and > > assigned the VF Device using vfio-pci device assignment and initialized > the > > virtual machine. > > insmod igb max_vfs=2 > > > > ./x86_64-softmmu/qemu-system-x86_64 -cpu host -boot c -hda > > /home/vm-images/vm2.imgsnapshot -m 2048M -smp 2 --enable-kvm -name 'vm2' > > -vnc :2 -pidfile /tmp/vm2.pid -driile=fat:rw:/tmp/share,snapshot=off > > -device vfio-pci,host=01:10.1,id=net1 > > > > > > 2. The VF Device was visible with another pci address. > > > > 00:04.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit > SFI/SFP+ > > Network > > Connection (rev 01) > > > > Further ran DPDK testpmd on top of VM but bound the virtual function > driver > > to igb_uio instead of vfio-pci. It ran successfully. The ixgbevf pmd > > driver is able to access the BAR registers in pci_uio_map_resource via > > mmaping somewhere close to hugepages. I was not able to bind the virtual > > function driver in VM to vfio-pci and hence DPDK would not be able to run > > with VFIO enabled as it complains of no IOMMU support. I also believe > that > > there is little logic in binding the vf device to vfio-pci again since > qemu > > has already taken care of it and hardware support is involved. > > > > So my questions are > > a. vfio is meant to be a replacement for both uio and device assignment > > for qemu. This doesnt seem simultaneous. Comment? > > What do you mean "device assignment" ? You mean pass-through? > > b. Is there any way to access VF device using VFIO in guest userspace? > > Have you run DPDK in guest machine with VFIO support enabled and all > > dependent modules inserted and did it work? > > As I knows, the answer is *NO*, because the iommu is not support in guest. > > c. Is igb_uio or uio_pci_generic in future the only way to access the > > device in guest userspace? > > It depends, who knows what will happen in future :) > > Thanks, > Michael > > *Regards* > > > > -- *Regards,* *Aashima Arora* *arora.aa91@gmail.com *