[PATCH] libxl: support ACPI shutdown flag

[Jim Fehlig <jfehlig@xxxxxxxx>]

Add support for VIR_DOMAIN_SHUTDOWN_ACPI_POWER_BTN flag in
libxlDomainShutdownFlags().  Inspired by similar functionality
in the Xen xl client.

Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---

I considered invoking libxl_send_trigger() immediately when
VIR_DOMAIN_SHUTDOWN_ACPI_POWER_BTN flag is specified, but in the
end decided to only honor the flag if a "normal" shutdown request
failed.  This behavior is similar to xl and conforms to the
virDomainShutdownFlags() docs

"If @flags is set to zero, then the hypervisor will choose the method
of shutdown it considers best. To have greater control pass one or
more of the virDomainShutdownFlagValues. The order in which the
hypervisor tries each shutdown method is undefined, and a hypervisor
is not required to support all methods."

I'm certainly receptive to only invoking libxl_send_trigger() when
VIR_DOMAIN_SHUTDOWN_ACPI_POWER_BTN is specified if folks think that
is a better approach.

 src/libxl/libxl_driver.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index b3f8df6..2b30c08 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -868,7 +868,7 @@ libxlDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
     int ret = -1;
     libxlDomainObjPrivatePtr priv;
 
-    virCheckFlags(0, -1);
+    virCheckFlags(VIR_DOMAIN_SHUTDOWN_ACPI_POWER_BTN, -1);
 
     if (!(vm = libxlDomObjFromDomain(dom)))
         goto cleanup;
@@ -883,17 +883,35 @@ libxlDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
     }
 
     priv = vm->privateData;
-    if (libxl_domain_shutdown(priv->ctx, vm->def->id) != 0) {
+    ret = libxl_domain_shutdown(priv->ctx, vm->def->id);
+    if (ret == ERROR_NOPARAVIRT) {
+        if (flags & VIR_DOMAIN_SHUTDOWN_ACPI_POWER_BTN) {
+            VIR_DEBUG("PV control interface not available, "
+                      "sending ACPI power button event.");
+            ret = libxl_send_trigger(priv->ctx, vm->def->id,
+                                     LIBXL_TRIGGER_POWER, 0);
+        } else {
+            virReportError(VIR_ERR_OPERATION_INVALID,
+                       "%s", _("PV control interface not available, "
+                               "preventing external graceful shutdown. "
+                               "Consider using an ACPI power event."));
+            ret = -1;
+            goto cleanup;
+        }
+    }
+
+    if (ret != 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Failed to shutdown domain '%d' with libxenlight"),
                        vm->def->id);
+        ret = -1;
         goto cleanup;
     }
 
-    /* vm is marked shutoff (or removed from domains list if not persistent)
+    /* ret == 0 == successful shutdown request
+     * vm is marked shutoff (or removed from domains list if not persistent)
      * in shutdown event handler.
      */
-    ret = 0;
 
  cleanup:
     if (vm)
-- 
1.8.1.4

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