[Xen-devel] [RFC XEN PATCH v4 39/41] tools/libxl: allow aborting domain creation on fatal QMP init errors

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

If some errors happening during QMP initialization can affect the
proper work of a domain, it'd be better to treat them as fatal errors
and abort the creation of that domain. The existing types of QMP
initialization errors are not treated as fatal, and do not abort the
domain creation as before.

Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/libxl_create.c | 4 +++-
 tools/libxl/libxl_qmp.c    | 9 ++++++---
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index f15fb215c2..075850b58f 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -1542,7 +1542,9 @@ static void domcreate_devmodel_started(libxl__egc *egc,
     if (dcs->sdss.dm.guest_domid) {
         if (d_config->b_info.device_model_version
             == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
-            libxl__qmp_initializations(gc, domid, d_config);
+            ret = libxl__qmp_initializations(gc, domid, d_config);
+            if (ret == ERROR_BADFAIL)
+                goto error_out;
         }
     }
 
diff --git a/tools/libxl/libxl_qmp.c b/tools/libxl/libxl_qmp.c
index eab993aca9..e1eb47c1d2 100644
--- a/tools/libxl/libxl_qmp.c
+++ b/tools/libxl/libxl_qmp.c
@@ -1175,11 +1175,12 @@ int libxl__qmp_initializations(libxl__gc *gc, uint32_t 
domid,
 {
     const libxl_vnc_info *vnc = libxl__dm_vnc(guest_config);
     libxl__qmp_handler *qmp = NULL;
-    int ret = 0;
+    bool ignore_error = true;
+    int ret = -1;
 
     qmp = libxl__qmp_initialize(gc, domid);
     if (!qmp)
-        return -1;
+        goto out;
     ret = libxl__qmp_query_serial(qmp);
     if (!ret && vnc && vnc->passwd) {
         ret = qmp_change(gc, qmp, "vnc", "password", vnc->passwd);
@@ -1189,7 +1190,9 @@ int libxl__qmp_initializations(libxl__gc *gc, uint32_t 
domid,
         ret = qmp_query_vnc(qmp);
     }
     libxl__qmp_close(qmp);
-    return ret;
+
+ out:
+    return ret ? (ignore_error ? ERROR_FAIL : ERROR_BADFAIL) : 0;
 }
 
 /*
-- 
2.15.1


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