Re: [PATCH] SUPPORT: Add linux device model stubdom to Toolstack

[Jason Andryuk <jandryuk@xxxxxxxxx>]

On Tue, May 26, 2020 at 6:50 AM George Dunlap <George.Dunlap@xxxxxxxxxx> wrote:
>
>
>
> > On May 25, 2020, at 3:55 AM, Jason Andryuk <jandryuk@xxxxxxxxx> wrote:
> >
> > Add qemu-xen linux device model stubdomain to the Toolstack section as a
> > Tech Preview.
> >
> > Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
> > ---
> > SUPPORT.md | 6 ++++++
> > 1 file changed, 6 insertions(+)
> >
> > diff --git a/SUPPORT.md b/SUPPORT.md
> > index e3a366fd56..25becc9192 100644
> > --- a/SUPPORT.md
> > +++ b/SUPPORT.md
> > @@ -153,6 +153,12 @@ Go (golang) bindings for libxl
> >
> >     Status: Experimental
> >
> > +### Linux device model stubdomains
> > +
> > +Support for running qemu-xen device model in a linux stubdomain.
> > +
> > +    Status: Tech Preview
>
> Acked-by: George Dunlap <george.dunlap@xxxxxxxxxx>
>
> Out of curiosity, what do you think is missing to be able to declare this 
> ‘Supported’?  Are there any features missing, or do we just  need to add a 
> test to osstest?

Yeah, adding testing would be good.  From this list of limitations:
 - PCI passthrough require permissive mode
 - at most 26 emulated disks are supported (more are still available
as PV disks)
 - only one nic is supported
 - graphics output (VNC/SDL/Spice) not supported

PCI passthrough requiring permissive mode is fine for now.  26
emulated disks is probably fine forever.  We should have support for
multiple nics, and I have a idea for that.

The lack of graphics output is probably the biggest limitation at this time.

Regards,
Jason