[Xen-devel] [PATCH] libxl: Specify no nics to qemu when no emulated nics

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

qemu will default to one emulated NIC if no network configuration is
specified on the command-line.  If there are no emualted NICs (i.e.,
no NICs or all NICs are PV), specify no nics to avoid getting an
emulated NIC by default.

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

diff -r bf64e1081333 -r 67e4cfb20569 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c       Fri Jun 25 16:05:20 2010 +0100
+++ b/tools/libxl/libxl.c       Mon Jun 28 16:17:32 2010 +0100
@@ -858,6 +858,8 @@
         flexarray_set(dm_args, num++, info->serial);
     }
     if (info->type == XENFV) {
+        int ioemu_vifs = 0;
+
         if (info->videoram) {
             flexarray_set(dm_args, num++, "-videoram");
             flexarray_set(dm_args, num++, libxl_sprintf(ctx, "%d", 
info->videoram));
@@ -901,8 +903,14 @@
                 flexarray_set(dm_args, num++, "-net");
                 flexarray_set(dm_args, num++, libxl_sprintf(ctx, 
"tap,vlan=%d,ifname=%s,bridge=%s",
                             vifs[i].devid, vifs[i].ifname, vifs[i].bridge));
+                ioemu_vifs++;
             }
         }
+        /* If we have no emulated nics, tell qemu not to create any */
+        if ( ioemu_vifs == 0 ) {
+            flexarray_set(dm_args, num++, "-net");
+            flexarray_set(dm_args, num++, "none");
+        }
     }
     if (info->saved_state) {
         flexarray_set(dm_args, num++, "-loadvm");

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