[Xen-devel] [PATCH V2] libxl: Set path to console on domain startup.

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

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@xxxxxxxxxx>

---
Change in V2:
  Adding bug report link.
  Reword the last part of the patch description.
  Cleanup the code.
  Use VIR_FREE before VIR_STRDUP.
  Remove the code from OpenConsole as it is now a duplicate.
---
 src/libxl/libxl_domain.c | 20 ++++++++++++++++++++
 src/libxl/libxl_driver.c | 15 ---------------
 2 files changed, 20 insertions(+), 15 deletions(-)

diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index 9c62291..325de79 100644
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -1290,6 +1290,26 @@ libxlDomainStart(libxlDriverPrivatePtr driver, 
virDomainObjPtr vm,
     if (libxlDomainSetVcpuAffinities(driver, vm) < 0)
         goto cleanup_dom;
 
+    if (vm->def->nconsoles) {
+        virDomainChrDefPtr chr = vm->def->consoles[0];
+        if (chr && chr->source.type == VIR_DOMAIN_CHR_TYPE_PTY) {
+            libxl_console_type console_type;
+            char *console = NULL;
+
+            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) {
+                VIR_FREE(chr->source.data.file.path);
+                ignore_value(VIR_STRDUP(chr->source.data.file.path, console));
+            }
+            VIR_FREE(console);
+        }
+    }
+
     if (!start_paused) {
         libxl_domain_unpause(priv->ctx, domid);
         virDomainObjSetState(vm, VIR_DOMAIN_RUNNING, 
VIR_DOMAIN_RUNNING_BOOTED);
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 53c87ce..e79afac 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -3957,10 +3957,8 @@ 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);
 
@@ -4002,18 +4000,6 @@ 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,
@@ -4027,7 +4013,6 @@ libxlDomainOpenConsole(virDomainPtr dom,
     }
 
  cleanup:
-    VIR_FREE(console);
     if (vm)
         virObjectUnlock(vm);
     return ret;
-- 
Anthony PERARD


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