Re: [Xen-devel] Running xenstored in Linux stubdom

[Juergen Gross <jgross@xxxxxxxx>]

On 06.09.19 20:01, Daniel Smith wrote:
> On Wed, Sep 4, 2019 at 1:26 PM Daniel Smith <dpsmith.dev@xxxxxxxxx> wrote:
> > On Wed, Sep 4, 2019 at 12:12 PM Juergen Gross <jgross@xxxxxxxx> wrote:
> > > The stubdom gets an event channel to use for dom0 xenbstore connection
> > > via commandline parameter ("--event <event-nr>"). This needs to be used
> > > in the stubdom for setting up the communication path.
> > >
> > >
> > > Juergen
> > Hi Juergen,
> >
> > Thanks for the quick response! tracing through xenstored, looks like
> > that flag sets the variable dom0_event which is only used in the
> > xenstored_minios.c as the return value to the xenbus_evtchn() call. I
> > could naively short circuit xenbus_evtchn() under xenstored_posix.c to
> > return immediately if dom0_event has been set. If that works, I would
> > be glad to submit it back upstream if there is interest in
> > incorporating it.
> Hi again,
>
> I made the change to short circuit the xenbus_evtchn and did testing
> as a guest domain approach to confirm that i was parsing the
> parameters correctly in initramfs script that init-xenstore-helper
> passed. I am still it hanging after the attempt to write
> /tool/xenstored/domid. At this point I was wondering if there might be
> a way to get console output from the domain to try and troubleshoot if
> xenstored is getting started when actually running as the actual
> stubdom instead of as a guest?
I think you are not mapping dom0 xenbus page. Have a look at
xenbus_map() in xenstored_minios.c. You could do the alternative
handling depending on the --event parameter specified.


Juergen

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