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xen / notify: introduce a new XenWatchList abstraction

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Xenstore watch call-backs are already abstracted away from XenBus using
the XenWatch data structure but the associated NotifierList manipulation
and file handle registration is still open coded in various xen_bus_...()
functions.
This patch creates a new XenWatchList data structure to allow these
interactions to be abstracted away from XenBus as well. This is in
preparation for a subsequent patch which will introduce separate watch lists
for XenBus and XenDevice objects.

NOTE: This patch also introduces a new notifier_list_empty() helper function
      for the purposes of adding an assertion that a XenWatchList is not
      freed whilst its associated NotifierList is still occupied.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Anthony Perard <anthony.perard@citrix.com>
Message-Id: <20190913082159.31338-2-paul.durrant@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Paul Durrant 2019-09-13 09:21:56 +01:00 • committed by Anthony PERARD
parent df6180bb56
commit 374752a26b
5 changed files with 87 additions and 45 deletions
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5
hw/xen/trace-events
View file

@ -19,9 +19,8 @@ xen_bus_unrealize(void) ""
xen_bus_enumerate(void) ""
xen_bus_type_enumerate(const char *type) "type: %s"
xen_bus_backend_create(const char *type, const char *path) "type: %s path: %s"
xen_bus_add_watch(const char *node, const char *key, char *token) "node: %s key: %s token: %s"
xen_bus_remove_watch(const char *node, const char *key, char *token) "node: %s key: %s token: %s"
xen_bus_watch(const char *token) "token: %s"
xen_bus_add_watch(const char *node, const char *key) "node: %s key: %s"
xen_bus_remove_watch(const char *node, const char *key) "node: %s key: %s"
xen_device_realize(const char *type, char *name) "type: %s name: %s"
xen_device_unrealize(const char *type, char *name) "type: %s name: %s"
xen_device_backend_state(const char *type, char *name, const char *state) "type: %s name: %s -> %s"