cpu: Forbid model fallback in the ppc64 driver

Unlike what happens on x86, on ppc64 you can't mix and match CPU
features to obtain the guest CPU you want regardless of the host
CPU, so the concept of model fallback doesn't apply.

Make sure CPU definitions emitted by the driver, eg. as output of
the cpuBaseline() and cpuUpdate() calls, reflect this fact.

diff --git a/src/cpu/cpu_ppc64.c b/src/cpu/cpu_ppc64.c
index f24fc412ed2c8b73d243d1440e98818fcd99e62c..33fec8bc56fb95c3fa93111dd270754eecc2bd8b 100644 (file)
--- a/src/cpu/cpu_ppc64.c
+++ b/src/cpu/cpu_ppc64.c
@@ -670,6 +670,7 @@ ppc64DriverUpdate(virCPUDefPtr guest,
     case VIR_CPU_MODE_HOST_MODEL:
     case VIR_CPU_MODE_HOST_PASSTHROUGH:
         guest->match = VIR_CPU_MATCH_EXACT;
+        guest->fallback = VIR_CPU_FALLBACK_FORBID;
         virCPUDefFreeModel(guest);
         return virCPUDefCopyModel(guest, host, true);
 
@@ -768,6 +769,7 @@ ppc64DriverBaseline(virCPUDefPtr *cpus,
 
     cpu->type = VIR_CPU_TYPE_GUEST;
     cpu->match = VIR_CPU_MATCH_EXACT;
+    cpu->fallback = VIR_CPU_FALLBACK_FORBID;
 
  cleanup:
     ppc64MapFree(map);