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

["Daniel P. Berrange" <berrange@redhat.com>]

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.

>      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.

Regards,
Daniel
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