[Qemu-devel] [Help]: Does qemu-system-aarch64 support virtio-9p? I got a problem when remap host file to guest in AArch64.

[Kevin Zhao]

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:
address@hidden ~]# 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.
     The Qemu version is QEMU emulator version 2.5.0 (Debian
1:2.5+dfsg-5ubuntu10.2). Besides test fedora24 guest, I have got the same
problem in Debian jessie.
      Kindly need your help~You will be really appreciated.

Best Regards,
Kevin Zhao