Add VIR_CONNECT_BASELINE_CPU_MIGRATABLE flag

This flag for virConnectBaselineCPU will allow filtering out
CPU features that block migration from the result.

https://bugzilla.redhat.com/show_bug.cgi?id=1171484

include/libvirt/libvirt-host.h

@@ -862,6 +862,7 @@ int virConnectGetCPUModelNames(virConnectPtr conn,
  */
 typedef enum {
     VIR_CONNECT_BASELINE_CPU_EXPAND_FEATURES  = (1 << 0),  /* show all features */
+    VIR_CONNECT_BASELINE_CPU_MIGRATABLE = (1 << 1),  /* filter out non-migratable features */
 } virConnectBaselineCPUFlags;
 
 char *virConnectBaselineCPU(virConnectPtr conn,

src/libvirt-host.c

@@ -1052,6 +1052,9 @@ virConnectGetCPUModelNames(virConnectPtr conn, const char *arch, char ***models,
  * without this flag features that are part of the CPU model will not be
  * listed.
  *
+ * If @flags includes VIR_CONNECT_BASELINE_CPU_MIGRATABLE, the resulting
+ * CPU will not include features that block migration.
+ *
  * Returns XML description of the computed CPU (caller frees) or NULL on error.
  */
 char *