Re: [Xen-users] DomU crashes with device_model_stubdomain_override=1 under Xen 4.5.0

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Ian Campbell
> Sent: 18 February 2015 13:38
> To: Kuba; Wei Liu; Paul Durrant
> Cc: xen-users@xxxxxxxxxxxxx
> Subject: Re: [Xen-users] DomU crashes with
> device_model_stubdomain_override=1 under Xen 4.5.0
> 
> On Mon, 2015-02-16 at 22:33 +0100, Kuba wrote:
> 
> Wei/Paul, I suppose this is the ioreq server related regression which
> was discovered and discussed on xen-devel recently?
> 

Certainly sounds like it. The symptom was hvmloader() bailing because PCi 
enumeration got screwed up.

> I'm still catching up on my email backlog from being away -- what's the
> status of the fix?

I posted a fix (in Xen) to the list a couple of weeks back and Jan committed it 
on Feb 10th:

http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=dd748d128d86996592afafea02e578cc7d4e6d42

I don't see it in the stable-4.5 branch yet though.

  Paul

> 
> > Dear List,
> >
> > I'm trying to bring up an HVM domain with
> >
> > device_model_stubdomain_override=1
> >
> > under Xen 4.5.0, but the domain always crashes just after creation.
> > Everything works flawlessly in Xen 4.4.x. Under 4.5.0 the domain starts
> > just fine if I change that line to "device_model_stubdomain_override=0".
> >
> > I'm using stub domains because they allow me to use storage driver
> domains.
> >
> > # xl -vvv create consumer.conf &> create.log
> > # xl list
> > Name                        ID   Mem VCPUs      State   Time(s)
> > Domain-0                     0  6144     4     r-----      36.1
> > consumer                    10   255     1     ---sc-       0.0
> > consumer-dm                 11    32     1     -b----       0.1
> >
> > There is no output in the VNC console.
> >
> > The logs are from Xen compiled with debug ?= y, verbose ?= y and
> > crash_debug ?= y, but the same happens with non-debug build.
> >
> > My consumer.conf:
> >
> > name='consumer'
> > device_model_stubdomain_override=1
> > builder='hvm'
> > vcpus=1
> > memory=256
> > disk=[
> > #'file:/root/fbsd.iso,xvda,r,devtype=cdrom'
> > ]
> > boot='d'
> > pae=1
> > nx=1
> > videoram=16
> > stdvga=1
> > sdl=0
> > vnc=1
> > vnclisten="0.0.0.0"
> > vncdisplay=31
> > localtime=1
> > xen_platform_pci=1
> > on_crash="preserve"
> >
> > I've ran out of ideas and I'd be very grateful for any advice on how to
> > find the cause of this issue.
> >
> > Best regards,
> > Kuba
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-users
> 

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