Re: [Xen-devel] [PATCH] libxl/xl: add support for Xen 9pfs

[Jim Fehlig <jfehlig@xxxxxxxx>]

On 03/23/2017 05:36 PM, Stefano Stabellini wrote:
> Add functions to libxl to setup a Xen 9pfs frontend/backend connection.
> Add support to xl to parse a xen_9pfs option in the VM config file, in
> the following format:
>
> xen_9pfs=["tag=share_dir,security_model=none,path=/path/share_dir"]
>
> where tag identifies the 9p share and it is required to mount it on the
> guest side, path is the path of the filesystem to share and the only
> security_model supported is "none" which means that files are stored
> using the same credentials as they are created on the guest (no user
> ownership squash or remap).
FYI, similar libvirt config:

  <filesystem type='mount' accessmode='passthrough'>
    <source dir='/path/share_dir'/>
    <target dir='/share_dir'/>
  </filesystem>

So security_model == accessmode. The docs for accessmode:

-----
The filesystem block has an optional attribute accessmode which specifies the 
security mode for accessing the source (since 0.8.5). Currently this only works 
with type='mount' for the QEMU/KVM driver. The possible values are:
passthrough
The source is accessed with the permissions of the user inside the guest. This 
is the default accessmode if one is not specified.
mapped
The source is accessed with the permissions of the hypervisor (QEMU process).

squash
Similar to 'passthrough', the exception is that failure of privileged operations 
like 'chown' are ignored. This makes a passthrough-like mode usable for people 
who run the hypervisor as non-root.
-----

Regards,
Jim


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