From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Monjalon Subject: Re: [PATCH] maintainers: claim responsability for xen Date: Mon, 19 Jun 2017 15:22:26 +0200 Message-ID: <3259340.9y2bTrEvHo@xps> References: <1478504326-68105-1-git-send-email-jianfeng.tan@intel.com> <1596758.olymjc7Tvq@xps> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Cc: dev@dpdk.org, Joao Martins , Konrad Rzeszutek Wilk , Konrad Rzeszutek Wilk , Xen-devel , techboard@dpdk.org To: "Tan, Jianfeng" Return-path: In-Reply-To: List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Thanks Jianfeng for giving new ideas. There is not much activity on Xen side. Is there someone working on DPDK+Xen? Any news? The technical board requested to re-consider Xen support in DPDK. It will be discussed in the next techboard meeting: https://annuel.framapad.org/p/r.0c3cc4d1e011214183872a98f6b5c7db 11/05/2017 13:41, Tan, Jianfeng: > Hi Thomas and all, > > Apologize for being an unqualified maintainer. > > > -----Original Message----- > From: Thomas Monjalon [mailto:thomas@monjalon.net] > > > Ping > > > > The Xen dom0 support in DPDK seems dead. > > > > Reminder: > > Last time we talked about, it was because of a severe bug which is not > > fixed yet: > > http://dpdk.org/ml/archives/dev/2016-July/044207.html > > For this bug, we removed the userspace memset(0) and suppose it has been done by kernel, however, xen0 uses __get_free_pages() kernel API to map hugepages and reseve memseg, I think it makes sense to zero the hugepage for xen0 in rte_dom0_mm kernel module (instead of some special code for xen0 in userspace) to keep aligned behavior. > > > http://dpdk.org/ml/archives/dev/2016-July/044376.html > > It does not make any sense to upstream a netfront PMD before we have a netback PMD, as the legacy netback driver would be the bottleneck. Anyone has plan on this? And a question mark keeps in my mind that is it a must to implement netback in dom0? > > From another perspective, instead of using netfront/netback, we can also use virtio/vhost as the device model; however, xl tool in xen only supports vhost-kernel backend instead of vhost-user backend. So anyone has plan to enhance xl tool so that we can accelerate dom0 just using vswitch like OVS-DPDK? > > A third solution is to use xenvirtio as the frontend, and vhost_xen as the backend. This solution is to use virtio ring on grant table mechanism of xen. Honestly, I don't even know if it still work now. And to make it more usable, better to upstream vhost_xen inside popular vswitch like OVS-DPDK. > > > The request (9 months ago) was to give more time for feedbacks: > > http://dpdk.org/ml/archives/dev/2016-July/044847.html > > Apologize again that I volunteer to maintain these files, but spend very few time on this. > > Thanks, > Jianfeng