[Xen-devel] [PATCH v3 2/2] xl: Register the AER event handler to handle AER errors

[Venu Busireddy <venu.busireddy@xxxxxxxxxx>]

When a guest is created, register the AER event handler to handle the
AER errors. When an AER error occurs, the handler will forcibly remove
the erring PCIe device from the guest.

Signed-off-by: Venu Busireddy <venu.busireddy@xxxxxxxxxx>
---
 tools/xl/xl_vmcontrol.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/xl/xl_vmcontrol.c b/tools/xl/xl_vmcontrol.c
index 89c2b25..9855cdb 100644
--- a/tools/xl/xl_vmcontrol.c
+++ b/tools/xl/xl_vmcontrol.c
@@ -656,6 +656,7 @@ int create_domain(struct domain_create *dom_info)
     const char *restore_source = NULL;
     int migrate_fd = dom_info->migrate_fd;
     bool config_in_json;
+    libxl_aer_watch *aer_ws = NULL;
 
     int i;
     int need_daemon = daemonize;
@@ -966,6 +967,12 @@ start:
     LOG("Waiting for domain %s (domid %u) to die [pid %ld]",
         d_config.c_info.name, domid, (long)getpid());
 
+    ret = libxl_reg_aer_events_handler(ctx, domid, &aer_ws);
+    if (ret) {
+        /* Log the error, and move on... */
+        LOG("libxl_reg_aer_events_handler() failed, ret = 0x%08x", ret);
+    }
+
     ret = libxl_evenable_domain_death(ctx, domid, 0, &deathw);
     if (ret) goto out;
 
@@ -993,6 +1000,7 @@ start:
             LOG("Domain %u has shut down, reason code %d 0x%x", domid,
                 event->u.domain_shutdown.shutdown_reason,
                 event->u.domain_shutdown.shutdown_reason);
+            libxl_unreg_aer_events_handler(ctx, domid, aer_ws);
             switch (handle_domain_death(&domid, event, &d_config)) {
             case DOMAIN_RESTART_SOFT_RESET:
                 domid_soft_reset = domid;
@@ -1059,6 +1067,7 @@ start:
 
         case LIBXL_EVENT_TYPE_DOMAIN_DEATH:
             LOG("Domain %u has been destroyed.", domid);
+            libxl_unreg_aer_events_handler(ctx, domid, aer_ws);
             libxl_event_free(ctx, event);
             ret = 0;
             goto out;

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