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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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3
include/hw/xen/xen-bus.h
View file

@ -14,6 +14,7 @@
typedef void (*XenWatchHandler)(void *opaque);
typedef struct XenWatchList XenWatchList;
typedef struct XenWatch XenWatch;
typedef struct XenEventChannel XenEventChannel;
@ -63,7 +64,7 @@ typedef struct XenBus {
BusState qbus;
domid_t backend_id;
struct xs_handle *xsh;
NotifierList watch_notifiers;
XenWatchList *watch_list;
XenWatch *backend_watch;
} XenBus;