[PATCH 1/6] libxl: Disable death events after receiving a shutdown event

[Jim Fehlig <jfehlig@xxxxxxxx>]

The libxl driver will handle all domain destruction and cleanup
when receiving a domain shutdown event from libxl. Commit fa30ee04a2a
introduced the ignoreDeathEvent boolean in the DomainObjPrivate struct
to ignore subsequent death events from libxl. But libxl already provides
a mechanism to disable death events via libxl_evdisable_domain_death.

This patch partially reverts commit fa30ee04a2a and instead uses
libxl_evdisable_domain_death to disable subsequent death events when
processing a shutdown event.

Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---
 src/libxl/libxl_domain.c | 23 +++++------------------
 src/libxl/libxl_domain.h |  3 ---
 2 files changed, 5 insertions(+), 21 deletions(-)

diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index db2966a599..bbcbd4c74f 100644
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -616,12 +616,6 @@ static void
 libxlDomainHandleDeath(libxlDriverPrivate *driver, virDomainObj *vm)
 {
     virObjectEvent *dom_event = NULL;
-    libxlDomainObjPrivate *priv = vm->privateData;
-
-    if (priv->ignoreDeathEvent) {
-        priv->ignoreDeathEvent = false;
-        return;
-    }
 
     if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
         return;
@@ -671,7 +665,6 @@ libxlDomainEventHandler(void *data, libxl_event *event)
     }
 
     if (event->type == LIBXL_EVENT_TYPE_DOMAIN_SHUTDOWN) {
-        libxlDomainObjPrivate *priv = vm->privateData;
         struct libxlShutdownThreadInfo *shutdown_info = NULL;
         virThread thread;
         g_autofree char *name = NULL;
@@ -688,12 +681,9 @@ libxlDomainEventHandler(void *data, libxl_event *event)
         name = g_strdup_printf("ev-%d", event->domid);
         /*
          * Cleanup will be handled by the shutdown thread.
-         * Ignore the forthcoming death event from libxl
          */
-        priv->ignoreDeathEvent = true;
         if (virThreadCreateFull(&thread, false, libxlDomainShutdownThread,
                                 name, false, shutdown_info) < 0) {
-             priv->ignoreDeathEvent = false;
             /*
              * Not much we can do on error here except log it.
              */
@@ -859,18 +849,17 @@ libxlDomainDestroyInternal(libxlDriverPrivate *driver,
     libxlDomainObjPrivate *priv = vm->privateData;
     int ret = -1;
 
-    /* Ignore next LIBXL_EVENT_TYPE_DOMAIN_DEATH as the caller will handle
-     * domain death appropriately already (having more info, like the reason).
-     */
-    priv->ignoreDeathEvent = true;
+    if (priv->deathW) {
+        libxl_evdisable_domain_death(cfg->ctx, priv->deathW);
+        priv->deathW = NULL;
+    }
+
     /* Unlock virDomainObj during destroy, which can take considerable
      * time on large memory domains.
      */
     virObjectUnlock(vm);
     ret = libxl_domain_destroy(cfg->ctx, vm->def->id, NULL);
     virObjectLock(vm);
-    if (ret)
-        priv->ignoreDeathEvent = false;
 
     return ret;
 }
@@ -921,8 +910,6 @@ libxlDomainCleanup(libxlDriverPrivate *driver,
         priv->deathW = NULL;
     }
 
-    priv->ignoreDeathEvent = false;
-
     if (!!g_atomic_int_dec_and_test(&driver->nactive) && driver->inhibitCallback)
         driver->inhibitCallback(false, driver->inhibitOpaque);
 
diff --git a/src/libxl/libxl_domain.h b/src/libxl/libxl_domain.h
index 661610bd3f..981bfc2bca 100644
--- a/src/libxl/libxl_domain.h
+++ b/src/libxl/libxl_domain.h
@@ -54,9 +54,6 @@ struct _libxlDomainObjPrivate {
     /* console */
     virChrdevs *devs;
     libxl_evgen_domain_death *deathW;
-    /* Flag to indicate the upcoming LIBXL_EVENT_TYPE_DOMAIN_DEATH is caused
-     * by libvirt and should not be handled separately */
-    bool ignoreDeathEvent;
     virThread *migrationDstReceiveThr;
     unsigned short migrationPort;
     char *lockState;
-- 
2.33.0