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xen-devel
RE: [Xen-devel] yanked share problem
Yes, that's the desired way in most cases, as long as domain crash event
can be notified to xenstore and then watches upon specific node can work
for this purpose. Normal shutdown command issued from user can follow
this process due to driver code aware to send traffic on xenbus. But
abnormal crash may not go to such branch. Maybe we need a heartbeat check
between xenstore and hooked domains? ;-)
When a domain dies (for any reason), a VIRQ_DOM_EXC will be sent to dom0,
telling it that something "exceptional" (like being shutdown, or crashing)
has happened to a domain. This causes some entity (currently still Xend,
AFAIK) to go check the state of all the domains - the store will get
updated appropriately as a result of this.
This should work even for crashes - in the current world, this mechanism
also ensures it's possible to restart domains, clean up their devices, etc
if they die unexpectedly.
So watching the store ought to be fine in all cases, so long as dom0 stays
up (which is another problem ;-)
Cheers,
Mark
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