Re: [PATCH v3 17/33] tools/xl: support new 9pfs backend xen-9pfsd

[Jason Andryuk <jandryuk@xxxxxxxxx>]

On Thu, Jan 4, 2024 at 4:02 AM Juergen Gross <jgross@xxxxxxxx> wrote:
>
> Add support for the new 9pfs backend "xen-9pfsd". For this backend type
> the tag defaults to "Xen" and the host side path to
> "/var/log/xen/guests/<dom-name>".
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> Reviewed-by: Jason Andryuk <jandryuk@xxxxxxxxx>
> ---
> V2:
> - test max_files and max_open_files, too (Jason Andryuk)
> ---
>  docs/man/xl.cfg.5.pod.in | 36 ++++++++++++++++++++++++++++++++++--
>  tools/xl/xl_parse.c      | 36 ++++++++++++++++++++++++++++++++++++
>  2 files changed, 70 insertions(+), 2 deletions(-)
>
> diff --git a/docs/man/xl.cfg.5.pod.in b/docs/man/xl.cfg.5.pod.in
> index 2e234b450e..80011adbf3 100644
> --- a/docs/man/xl.cfg.5.pod.in
> +++ b/docs/man/xl.cfg.5.pod.in
> @@ -772,10 +772,16 @@ settings, from the following list:
>
>  =over 4
>
> +=item B<type=TYPE>
> +
> +The backendtype for the PV device. Supported values are B<qemu> and
> +B<xen-9pfsd>.  The default is B<qemu>.
> +
>  =item B<tag=STRING>
>
>  9pfs tag to identify the filesystem share. The tag is needed on the
> -guest side to mount it.
> +guest side to mount it. For the backendtype of B<xen-9pfsd> the tag defaults 
> to
> +"Xen".

Here and below it's "xen_9pfsd" as the type.

I tried mounting a xen-9pfsd export in Linux, but mount failed:
mount: /mnt/9p-b: mount(2) system call failed: Remove I/O error.
dmesg(1) may have more information after failed mount system call.

dmesg doesn't have any other details.
/sys/bus/xen/devices/9pfs-2/state shows Connected.

Regards,
Jason