From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52914) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fiiXy-0007hA-Dp for qemu-devel@nongnu.org; Thu, 26 Jul 2018 11:51:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fiiXu-0007cM-De for qemu-devel@nongnu.org; Thu, 26 Jul 2018 11:51:22 -0400 Received: from mail-wr1-x443.google.com ([2a00:1450:4864:20::443]:39957) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fiiXu-0007af-2d for qemu-devel@nongnu.org; Thu, 26 Jul 2018 11:51:18 -0400 Received: by mail-wr1-x443.google.com with SMTP id h15-v6so2195904wrs.7 for ; Thu, 26 Jul 2018 08:51:17 -0700 (PDT) References: <1407239306.11199051.1530240887935.JavaMail.zimbra@redhat.com> <20180705194311-mutt-send-email-mst@kernel.org> <20180726145214.GD17777@stefanha-x1.localdomain> From: Marcel Apfelbaum Message-ID: <488bdc8d-e36c-ad3e-f7b3-a45a78a99dda@gmail.com> Date: Thu, 26 Jul 2018 18:51:13 +0300 MIME-Version: 1.0 In-Reply-To: <20180726145214.GD17777@stefanha-x1.localdomain> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Subject: Re: [Qemu-devel] Question: SRIOV support over Win Hyper-V VM running in QEMU process on Linux host List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi , Elijah Shakkour , Knut Omang Cc: "qemu-devel@nongnu.org" , Tal Attaly , "Michael S. Tsirkin" Hi On 07/26/2018 05:52 PM, Stefan Hajnoczi wrote: > On Thu, Jul 12, 2018 at 07:33:14AM +0000, Elijah Shakkour wrote: >> Hey, >> >> Our team is adding a NIC functional emulation to QEMU. >> One of the features we are adding to this NIC is SRIOV. >> >> Here is the error message I get when checking SRIOV support of our emulated NIC on Win2016 server (the hyper-v VM). >> " >> SR-IOV cannot be used on this system as the PCI Express hardware does not support Access Control Services (ACS) at any root port. QEMU's emulated PCI Express Root Ports do not support ACS yet, however I am not sure ACS is a prerequisite for SR-IOV. We would need ARI support for allowing more than 8VFs, but QEMU doesn't support that either (yet). Knut Omag has some working patches, he successfully implemented SR-IOV with QEMU, see:      https://github.com/knuto/qemu/tree/sriov_patches_v7 The code was not merged since we need at least a device with SR-IOV support to justify the addition. >> Contact your system vendor for further information. >> " > I'm not sure what the status of emulated SR-IOV is so I have CCed > Michael Tsirkin and Marcel Apfelbaum, the PCI maintainers in QEMU. Thanks, Marcel >> Could you please advise about what could be the issue here? >> >> BTW: I use same configuration (VM XML file attached) when running linux VM (RH7.2) image (instead of Win Hyper-V) over the same host and SRIOV is working for me there. >> >> Here the XML file I use to define the VM (our emulated NIC is added at the end of XML): >> " >> >> nst105 >> 0249a525-2ee2-432b-a1f5-a6db83b089a3 >> 8388608 >> 8388608 >> 8 >> >> /machine >> >> >> hvm >> >> >> >> >> >> >> >> >> >> >> >> SandyBridge >> >> >> >> >> >> >> >> >> >> destroy >> restart >> destroy >> >> >> >> >> >> /opt/qemu/bin/qemu-system-x86_64 >> >> >> >> >> >>
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