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Re: [PATCH v2 13/17] tools/xenstored: Delay firing special watches
- To: Jason Andryuk <jason.andryuk@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 17 Jul 2025 10:41:40 +0200
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- Cc: Julien Grall <julien@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Delivery-date: Thu, 17 Jul 2025 08:41:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.07.25 23:15, Jason Andryuk wrote:
fire_special_watches() can only be called after setup_structure() has
been called. If it is called before setup_structure(), the hashtable
search will segfault as the nodes hashtable has not been allocated.
Normally, dom0 is setup up first and setup_structure() runs before any
other domain.
If we iterate xenmanage_poll_changed_domain() to discover domains, there
is no guarantee the local domain running xenstored will be created
first. Suppress firing special watches until the hashtable has been
allocated.
Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
---
With a known domid, xenstored could construct that first and the iterate
skipping itself.
Another solution would be to modify the next patch to first scan the
initial domains in a loop and only then introduce them after knowing
which one is hosting Xenstore.
Juergen
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