Re: [Xen-devel] [PATCH v3 02/17] Document ioemu Linux stubdomain protocol

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On Thu, Feb 21, 2019 at 03:39:25PM +0000, Wei Liu wrote:
> On Mon, Jan 28, 2019 at 10:30:19PM +0100, Marek Marczykowski-Górecki wrote:
> > Add documentation for upcoming Linux stubdomain for qemu-upstream.
> > 
> > Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
> > ---
> >  docs/misc/stubdom.txt | 50 ++++++++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 50 insertions(+)
> > 
> > diff --git a/docs/misc/stubdom.txt b/docs/misc/stubdom.txt
> > index 4c524f2..9c94c6b 100644
> > --- a/docs/misc/stubdom.txt
> > +++ b/docs/misc/stubdom.txt
> > @@ -75,6 +75,56 @@ Defined commands:
> >     - "running" - success
> >  
> >  
> > +Toolstack to Linux ioemu stubdomain protocol
> > +--------------------------------------------
> > +
> > +This section describe communication protocol between toolstack and
> > +qemu-upstream running in Linux stubdomain. The protocol include
> > +expectations of both stubdomain, and qemu.
> > +
> > +Setup (done by toolstack, expected by stubdomain):
> > + - Block devices for target domain are connected as PV disks to stubdomain,
> > +   according to configuration order, starting with xvda
> > + - Network devices for target domain are connected as PV nics to 
> > stubdomain,
> > +   according to configuration order, starting with 0
> > + - [not implemented] if graphics output is expected, VFB and VKB devices 
> > are set for stubdomain
> > +   (its backend is responsible for exposing them using appropriate protocol
> > +   like VNC or Spice)
> > + - other target domain's devices are not connected at this point to 
> > stubdomain
> > +   (may be hot-plugged later)
> > + - QEMU command line is stored in
> > +   /vm/<target-uuid>/image/dmargs xenstore dir, each argument as separate 
> > key
> > +   in form /vm/<target-uuid>/image/dmargs/NNN, where NNN is 0-padded 
> > argument
> > +   number
> > + - target domain id is stored in /local/domain/<stubdom-id>/target 
> > xenstore path
> > +?? - bios type is stored in /local/domain/<target-id>/hvmloader/bios
> 
> Since you're defining a new protocol here, you have the liberty to
> eliminate this uncertainty, unless for some reason you want it to be
> compatible with the old stubdom?

I'm not sure who access this xenstore key, since I haven't found how is
it used in minios based stubdomain. Is it used by qemu?

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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