[Qemu-devel] [PATCH -V3 00/32] virtio-9p: paravirtual file system passthrough

[Aneesh Kumar K.V]

This patch series adds a paravirtual file system passthrough mechanism to QEMU
based on the 9P protocol. With the current implementation, all I/O is 
implemented in the VCPU thread.  We've modified the protocol handlers so that
we can support dispatch I/O in a thread pool. The actual thread pool 
implementation
will be posted later

This patch set should work with any recent Linux kernel as virtio-9p has been
supported for a few kernel releases now. Export dir is specified using the below
Qemu option.

-fsdev fstype,id=ID,path=path/to/share \
          -device virtio-9p-pci,fsdev=ID,mount_tag=tag \
or
 
-virtfs fstype,path=path/to/share,mount_tag=tag

Only supported fstype currently is "local". mount_tag is used to identify
the mount point in the kernel. This will be available in Linux
kernel via /sys/devices/virtio-pci/virtio1/mount_tag file.

Changes from V2:
1) Added new method for specifying export dir. This new method should be more 
flexible.
2) rebased to qemu master bedd2912c83b1a87a6bfe3f59a892fd65cda7084

Changes from V1:
1) fsstress test suite runs successfully with the patches. That should indicate 
   patches are stable enough to be merged.
2) Added proper error handling to all posix_* calls.
3) Fixed code to follow Qemu coding style.
4) Other bug fixes most of which are folded back into the original patches
5) rebased to qemu master 0aef4261ac0ec9089ade0e3a92f986cb4ba7317e

-aneesh