<html><body>Thanks Dave. That was quick! Igor, any idea when this will happen? :-) <img width="16" height="16" src="cid:1__=8FBB0E5DDFFB06788f9e8a93df938690918c8FB@" border="0" alt="Inactive hide details for "Dr. David Alan Gilbert" ---12/12/2019 01:59:15 PM---* Gong Su (gongsu@us.ibm.com) wrote: >">"Dr. David Alan Gilbert" ---12/12/2019 01:59:15 PM---* Gong Su (gongsu@us.ibm.com) wrote: > From: "Dr. David Alan Gilbert" <dgilbert@redhat.com> To: Gong Su <gongsu@us.ibm.com> Cc: virtio-fs@redhat.com, Cornelia Huck <cohuck@redhat.com> Date: 12/12/2019 01:59 PM Subject: [EXTERNAL] Re: [Virtio-fs] virtio-fs on zLinux (s390x) <hr width="100%" size="2" align="left" noshade style="color:#8091A5; "> <tt>* Gong Su (gongsu@us.ibm.com) wrote: > > > Hi Stefan, I'm resending my questions to the list per your request. > > Basically, I'm trying to see if I can get virtio-fs to work on zLinux. > Following the instructions on </tt><tt><a href="https://virtio-fs.gitlab.io/howto-qemu.html">https://virtio-fs.gitlab.io/howto-qemu.html</a></tt><tt> I > was able to compile all the pieces but when I tried to run qemu I realized > that it needs -numa option which isn't supported on s390x yet. > > I have talked to Christian Borntraeger (whom I worked with on other > projects before) and he indicated that he had a plan to add -numa support > for s390x but currently is busy on other things. > > So I'm trying to see if there are other ways for me to go forward without > having to wait for Christian. I see two options: > > 1. Merge virtiofsd into qemu itself. In the "Interchangeability" section of > the virtio-fs design page (</tt><tt><a href="https://virtio-fs.gitlab.io/design.html">https://virtio-fs.gitlab.io/design.html</a></tt><tt> ), it > mentioned that "It is also possible to forego vhost-user and emulate the > virtio-fs device directly inside the hypervisor, although this may result > in poor isolation and security." Since each guest typically gets its own > qemu process, maybe this is acceptable for some use cases. In exchange, you > get the benefit of not having to carve out a chunk of memory from /dev/shm > (and maybe simpler communication between virtiofsd and qemu). > 2. Use something other than -numa to share memory between virtiofsd and > qemu that's supported on zLinux. I'm not entirely familiar with qemu so I > have no idea whether this is possible or not. Hi, My understanding is that Igor Mammedov (imammedo@redhat.com) has plans to allow 'shared' to be set on main memory, so we wouldn't need the numa code. Dave > Thanks. > _______________________________________________ > Virtio-fs mailing list > Virtio-fs@redhat.com > </tt><tt><a href="https://www.redhat.com/mailman/listinfo/virtio-fs">https://www.redhat.com/mailman/listinfo/virtio-fs</a></tt><tt> -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK </tt> </body></html>