[PATCH] libxl: Use -vcpu_avail with qemu-xen.

[Anthony PERARD <anthony.perard@citrix.com>]

This require the series CPU hotplug for qemu-xen.

Note: this patch is valid only for 4.3 as the -vcpu_avail will
probably not be upstream to Qemu.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
 tools/libxl/libxl_dm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 1e3a9f4..2db2372 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -530,11 +530,17 @@ static char ** libxl__build_device_model_args_new(libxl__gc *gc,
             flexarray_append(dm_args, "-smp");
             if (b_info->avail_vcpus.size) {
                 int nr_set_cpus = 0;
+                char *s;
                 nr_set_cpus = libxl_bitmap_count_set(&b_info->avail_vcpus);
 
                 flexarray_append(dm_args, libxl__sprintf(gc, "%d,maxcpus=%d",
                                                          nr_set_cpus,
                                                          b_info->max_vcpus));
+                
+                s = libxl_bitmap_to_hex_string(CTX, &b_info->avail_vcpus);
+                flexarray_vappend(dm_args, "-vcpu_avail",
+                                  libxl__sprintf(gc, "%s", s), NULL);
+                free(s);
             } else
                 flexarray_append(dm_args, libxl__sprintf(gc, "%d",
                                                          b_info->max_vcpus));
-- 
Anthony PERARD