Re: [Qemu-devel] RFC: configuring QEMU virtfs for Xen PV(H) guests

[Stefano Stabellini]

On Fri, 12 Feb 2016, Wei Liu wrote:
> # Option 3: Only use -fsdev
> 
> The third way of doing it would be to not use QEMU command line to
> create device at all. We only use -fsdev to create fsdev and in
> xen_init_pv we reply on information in xenstore to create 9pfs
> transport. In this case:
> 
> 1. Toolstack arranges some xenstore entries.
> 2. Toolstack arranges command line options for QEMU:
>       -fsdev XXX
> 3. QEMU starts up in xen-attach mode, scans xenstore for relevant
>    entries, creates 9pfs transport on the fly.
> 
> Downside: This seems to deviate from how we do things before
> (comparing with other device like nic and disk).

I think this is best and actually it is like the other PV devices in
QEMU: xen_nic is not used at all and xen_disk is configured without
command line options, like you are suggesting here.