cpuid: Ignore known QEMU 1.2 KVM CPUID bug

QEMU 1.2 and older didn't ensure stable KVM feature bits, so ignore them
on pc-1.2 and older machine-types.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

qemu/tests/cfg/qemu_cpu.cfg

@@ -251,6 +251,11 @@
                         ignore_cpuid_leaves += " 0,0,ebx 0,0,ecx 0,0,edx"
                         ignore_cpuid_leaves += " 0x80000000,0,ebx 0x80000000,0,ecx 0x80000000,0,edx"
 
+                    #FIXED BUG: QEMU 1.2 and older didn't ensure stable KVM feature bits:
+                    kvm:
+                        pc_1_2, pc_1_1, pc_1_0:
+                            ignore_cpuid_leaves += " 0x40000001,0,eax"
+
                     #KNOWN BUG: QEMU 2.1.0 broke the ABI by changing
                     # CPUID[0x40000000].EAX without any compat code
                     kvm: