[libvirt] [PATCH] Do not drop kernel cmdline for xen pv domains

[Jim Fehlig <jfehlig novell com>]

Kernel cmdline args can be passed to xen pv domains even when a
bootloader is specified.  The current config-to-sxpr mapping
ignores cmdline when bootloader is present.

Since the xend sub-driver is used with many xen toolstack versions,
this patch takes conservative approach of adding an else block to
existing !def->os.bootloader, and only appends sxpr if def->os.cmdline
is non-NULL.
---
 src/xenxs/xen_sxpr.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/xenxs/xen_sxpr.c b/src/xenxs/xen_sxpr.c
index 13ca015..bd770bc 100644
--- a/src/xenxs/xen_sxpr.c
+++ b/src/xenxs/xen_sxpr.c
@@ -2261,6 +2261,12 @@ xenFormatSxpr(virConnectPtr conn,
         }
 
         virBufferAddLit(&buf, "))");
+    } else {
+        /* PV domains accept kernel cmdline args */
+        if (def->os.cmdline) {
+            virBufferEscapeSexpr(&buf, "(image (linux (args '%s')))",
+                                 def->os.cmdline);
+        }
     }
 
     for (i = 0 ; i < def->ndisks ; i++)
-- 
1.7.5.4