libxl: Set path to console on domain startup.

The path to the pty of a Xen PV console is set only in
virDomainOpenConsole. But this is done too late. A call to
virDomainGetXMLDesc done before OpenConsole will not have the path to
the pty, but a call after OpenConsole will.

e.g. of the current issue.
Starting a domain with '<console type="pty"/>'
Then:
virDomainGetXMLDesc():
  <devices>
    <console type='pty'>
      <target type='xen' port='0'/>
    </console>
  </devices>
virDomainOpenConsole()
virDomainGetXMLDesc():
  <devices>
    <console type='pty' tty='/dev/pts/30'>
      <source path='/dev/pts/30'/>
      <target type='xen' port='0'/>
    </console>
  </devices>

The patch intend to have the TTY path on the first call of GetXMLDesc.
This is done by setting up the path at domain start up instead of in
OpenConsole.

https://bugzilla.redhat.com/show_bug.cgi?id=1170743

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>

diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index 91851172aec6973091d4153976190bf2107cb370..856cfb40305d7f50984efb8527a86f96bb6858cf 100644 (file)
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -1149,6 +1149,42 @@ libxlDomainFreeMem(libxlDomainObjPrivatePtr priv, libxl_domain_config *d_config)
     return ret;
 }
 
+static void
+libxlConsoleCallback(libxl_ctx *ctx, libxl_event* ev, void *for_callback)
+{
+    virDomainObjPtr vm = for_callback;
+    libxlDomainObjPrivatePtr priv = vm->privateData;
+    size_t i;
+
+    virObjectLock(vm);
+    for (i = 0; i < vm->def->nconsoles; i++) {
+        virDomainChrDefPtr chr = vm->def->consoles[i];
+        if (chr && chr->source.type == VIR_DOMAIN_CHR_TYPE_PTY) {
+            libxl_console_type console_type;
+            char *console = NULL;
+            int ret;
+
+            console_type =
+                (chr->targetType == VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_SERIAL ?
+                 LIBXL_CONSOLE_TYPE_SERIAL : LIBXL_CONSOLE_TYPE_PV);
+            ret = libxl_console_get_tty(priv->ctx, ev->domid,
+                                        chr->target.port, console_type,
+                                        &console);
+            if (!ret) {
+                VIR_FREE(chr->source.data.file.path);
+                if (console && console[0] != '\0') {
+                    ignore_value(VIR_STRDUP(chr->source.data.file.path,
+                                            console));
+                }
+            }
+            VIR_FREE(console);
+        }
+    }
+    virObjectUnlock(vm);
+    libxl_event_free(ctx, ev);
+}
+
+
 /*
  * Start a domain through libxenlight.
  *
@@ -1173,6 +1209,7 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
     libxl_domain_restore_params params;
 #endif
     virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
+    libxl_asyncprogress_how aop_console_how;
 
     libxl_domain_config_init(&d_config);
 
@@ -1242,17 +1279,21 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
 
     /* Unlock virDomainObj while creating the domain */
     virObjectUnlock(vm);
+
+    aop_console_how.for_callback = vm;
+    aop_console_how.callback = libxlConsoleCallback;
     if (restore_fd < 0) {
         ret = libxl_domain_create_new(priv->ctx, &d_config,
-                                      &domid, NULL, NULL);
+                                      &domid, NULL, &aop_console_how);
     } else {
 #ifdef LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS
         params.checkpointed_stream = 0;
         ret = libxl_domain_create_restore(priv->ctx, &d_config, &domid,
-                                          restore_fd, &params, NULL, NULL);
+                                          restore_fd, &params, NULL,
+                                          &aop_console_how);
 #else
         ret = libxl_domain_create_restore(priv->ctx, &d_config, &domid,
-                                          restore_fd, NULL, NULL);
+                                          restore_fd, NULL, &aop_console_how);
 #endif
     }
     virObjectLock(vm);

diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index ce7b95a547dfd53e7a1c1c09c89905bc0fb95d0a..cd56cbcd7b4cf2db454b23fc0891703a1b03c551 100644 (file)
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -3991,10 +3991,8 @@ libxlDomainOpenConsole(virDomainPtr dom,
 {
     virDomainObjPtr vm = NULL;
     int ret = -1;
-    libxl_console_type console_type;
     virDomainChrDefPtr chr = NULL;
     libxlDomainObjPrivatePtr priv;
-    char *console = NULL;
 
     virCheckFlags(VIR_DOMAIN_CONSOLE_FORCE, -1);
 
@@ -4036,18 +4034,6 @@ libxlDomainOpenConsole(virDomainPtr dom,
         goto cleanup;
     }
 
-    console_type =
-        (chr->targetType == VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_SERIAL ?
-                            LIBXL_CONSOLE_TYPE_SERIAL : LIBXL_CONSOLE_TYPE_PV);
-
-    ret = libxl_console_get_tty(priv->ctx, vm->def->id, chr->target.port,
-                                console_type, &console);
-    if (ret)
-        goto cleanup;
-
-    if (VIR_STRDUP(chr->source.data.file.path, console) < 0)
-        goto cleanup;
-
     /* handle mutually exclusive access to console devices */
     ret = virChrdevOpen(priv->devs,
                         &chr->source,
@@ -4061,7 +4047,6 @@ libxlDomainOpenConsole(virDomainPtr dom,
     }
 
  cleanup:
-    VIR_FREE(console);
     if (vm)
         virObjectUnlock(vm);
     return ret;