qemu: Don't use full CPU model expansion

We used type=full expansion on the result of previous type=static
expansion to get all possible spellings of CPU features. Since we can
now translate the QEMU's canonical names to our names, we can drop this
magic and do only type=static CPU model expansion.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_capabilities.c

@@ -2494,10 +2494,13 @@ virQEMUCapsProbeQMPHostCPU(virQEMUCapsPtr qemuCaps,
 
     /* Some x86_64 features defined in cpu_map.xml use spelling which differ
      * from the one preferred by QEMU. Static expansion would give us only the
-     * preferred spelling, thus we need to do a full expansion on the result of
-     * the initial static expansion to get all variants of all features.
+     * preferred spelling. With new QEMU we always use the QEMU's canonical
+     * names of all features and translate between them and our names. But for
+     * older version of QEMU we need to do a full expansion on the result of
+     * the initial static expansion to get all variants of feature names.
      */
-    if (ARCH_IS_X86(qemuCaps->arch))
+    if (ARCH_IS_X86(qemuCaps->arch) &&
+        !virQEMUCapsGet(qemuCaps, QEMU_CAPS_CANONICAL_CPU_FEATURES))
         type = QEMU_MONITOR_CPU_MODEL_EXPANSION_STATIC_FULL;
     else
         type = QEMU_MONITOR_CPU_MODEL_EXPANSION_STATIC;