commit d08067f04248c7f1bd797f4401308ea9a8971f1b
Author: Jim Fehlig <jfehlig@novell.com>
Date:   Fri Nov 13 14:44:56 2009 -0700

    xen-unstable changeset 19788 removed MAX_VIRT_CPUS from public
    headers, breaking compilation of libvirt on -unstable.  Its
    semanitc was retained with XEN_LEGACY_MAX_VCPUS.  Ensure
    MAX_VIRT_CPUS is defined accordingly.

diff --git a/src/xen/xen_hypervisor.c b/src/xen/xen_hypervisor.c
index 6d8bfdd..843102a 100644
--- a/src/xen/xen_hypervisor.c
+++ b/src/xen/xen_hypervisor.c
@@ -109,6 +109,14 @@ typedef privcmd_hypercall_t hypercall_t;
 #define SYS_IFACE_MIN_VERS_NUMA 4
 #endif
 
+/* xen-unstable changeset 19788 removed MAX_VIRT_CPUS from public
+ * headers.  Its semanitc was retained with XEN_LEGACY_MAX_VCPUS.
+ * Ensure MAX_VIRT_CPUS is defined accordingly.
+ */
+#if !defined(MAX_VIRT_CPUS) && defined(XEN_LEGACY_MAX_VCPUS)
+#define MAX_VIRT_CPUS XEN_LEGACY_MAX_VCPUS
+#endif
+
 static int xen_ioctl_hypercall_cmd = 0;
 static int initialized = 0;
 static int in_init = 0;