Hello,
today I wanted to find out if it was possible to migrate a paused
domain. So, I tried the following:
# xm pause <dom>
# xm migrate <dom> <dest>
Unfortunately, the migration process would just hang before suspending
the domain and transferring its state. In order to resume it and
complete migration, I had to unpause the domain:
# xm unpause <dom>
After that, the process did get completed successfully.
-----
Then, I tried and track down the reason of this in the sources, and I
came to the following snip (XendDomainInfo.py):
def waitForShutdown(self):
self.state_updated.acquire()
try:
while self._stateGet() in
(DOM_STATE_RUNNING,DOM_STATE_PAUSED):
self.state_updated.wait()
finally:
self.state_updated.release()
It looks like that makes it wait forever, since the domain remains stuck
in the DOM_STATE_PAUSED state.
Now, the question is: is that the right behaviour or am I missing
something? Is it really not possible to migrate a paused domain?
Thanks,
- AS
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> today I wanted to find out if it was possible to migrate a paused > domain. So, I tried the following: > > # xm pause <dom> > # xm migrate <dom> <dest> >For PV domains, migrate requires the DomU itself to make a suspend call to the hypervisor when it is ready to suspend. I guess it can''t do that if it is paused... James _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
James Harper ha scritto:>> today I wanted to find out if it was possible to migrate a paused >> domain. So, I tried the following: >> >> # xm pause <dom> >> # xm migrate <dom> <dest> >> > > For PV domains, migrate requires the DomU itself to make a suspend call > to the hypervisor when it is ready to suspend. I guess it can''t do that > if it is paused... > > JamesI see. Would you be so kind to point me at that suspend call in the sources? Thanks again! - AS _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
On Saturday 19 July 2008, Alessandro Sardo wrote:> James Harper ha scritto: > >> today I wanted to find out if it was possible to migrate a paused > >> domain. So, I tried the following: > >> > >> # xm pause <dom> > >> # xm migrate <dom> <dest> > > > > For PV domains, migrate requires the DomU itself to make a suspend call > > to the hypervisor when it is ready to suspend. I guess it can''t do that > > if it is paused... > > > > James > > I see. Would you be so kind to point me at that suspend call in the > sources?In the Linux sources I think you could start browsing from drivers/xen/core/reboot.c::xen_suspend(). The final hypercall to suspend the guest (HYPERVISOR_suspend) is done in drivers/xen/core/machine_reboot.c::take_machine_down() Hope that helps, Cheers, Mark> > Thanks again! > > - AS > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel-- Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/) _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel