On 05.08.2016 12:27, Claudio Fontana wrote: > Hi, > > On 05.08.2016 10:28, Daniel P. Berrange wrote: >> On Fri, Aug 05, 2016 at 10:23:58AM +0800, Kevin Zhao wrote: >>> Hi All, >>> I have a problem may about Qemu and kindly need your help. Does >>> qemu-system-aarch64 support virtio-9p ? >>> Recently I have tried to use qemu remapped the file from host to >>> guest. As I know, Qemu has supported this so long as guest kernel has >>> support 9p(virtfs). Reference to this link: >>> http://wiki.qemu.org/Documentation/9psetup >>> Fedora 24 AArch64 kernel has supported this: >>> [root@sha-win-225 ~]# lsmod | grep 9p >>> 9p 56273 0 >>> fscache 87449 1 9p >>> 9pnet_virtio 9122 0 >>> 9pnet 83564 2 9p,9pnet_virtio >>> virtio_ring 13866 5 virtio_net,virtio_pci,9pnet_ >>> virtio,virtio_mmio,virtio_scsi >>> virtio 9467 5 virtio_net,virtio_pci,9pnet_ >>> virtio,virtio_mmio,virtio_scsi >>> >>> Now I use virsh to launch the VM, and the corresponding qemu command I >>> have pasted here: >>> http://paste.openstack.org/show/549225/. >>> You can see that: >>> * -fsdev >>> local,security_model=mapped,id=fsdev-fs0,path=/var/lib/libvirt/images/coreos >>> -device >>> virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=share,bus=pci.2,addr=0x1* >>> Here is the command that remapped the directory from host to guest. >>> After VM launched, I use the command to mount: >>> * mount -t 9p -o trans=virtio share /tmp/shared/ >>> -oversion=9p2000.L,posixacl,cache=loose* >>> But mount command will be blocked and output nothing. >> >> Try using version=9p2000.u instead - I've noticed other versions have >> been buggy in various kernel version/qemu version combinations. The >> 9p2000.u version is what i use in libvirt-sandobx and so I know it will >> work in general. > > We are using version=9p2000.L here with qemu-system-aarch64, and it works > well. > We tested only on qemu-2.5 though.
Forgot to mention though that we backported commit c8225aa1 "virtio-9p: use accessor to get thread_pool" though, as without it we have experienced crashes. Ciao, C.