cpuCompare: Fix comparison of two host CPUs

When a CPU to be compared with host CPU describes a host CPU instead of
a guest CPU, the result is incorrect. This is because instead of
treating additional features in host CPU description as required, they
were treated as if they were mentioned with all possible policies at the
same time.

diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index 114235c770fc814c9dfe9f07085fb7d78b066062..ab7c8cc77eb1307d17d4a6bfba6a73612a13766b 100644 (file)
--- a/src/cpu/cpu_x86.c
+++ b/src/cpu/cpu_x86.c
@@ -826,8 +826,7 @@ x86ModelFromCPU(const virCPUDefPtr cpu,
     struct x86_model *model = NULL;
     int i;
 
-    if (cpu->type == VIR_CPU_TYPE_HOST
-        || policy == VIR_CPU_FEATURE_REQUIRE) {
+    if (policy == VIR_CPU_FEATURE_REQUIRE) {
         if ((model = x86ModelFind(map, cpu->model)) == NULL) {
             virCPUReportError(VIR_ERR_INTERNAL_ERROR,
                     _("Unknown CPU model %s"), cpu->model);
@@ -839,6 +838,8 @@ x86ModelFromCPU(const virCPUDefPtr cpu,
     }
     else if (VIR_ALLOC(model) < 0)
         goto no_memory;
+    else if (cpu->type == VIR_CPU_TYPE_HOST)
+        return model;
 
     for (i = 0; i < cpu->nfeatures; i++) {
         const struct x86_feature *feature;
@@ -1181,7 +1182,7 @@ x86Compute(virCPUDefPtr host,
     }
 
     if (!(map = x86LoadMap()) ||
-        !(host_model = x86ModelFromCPU(host, map, 0)) ||
+        !(host_model = x86ModelFromCPU(host, map, VIR_CPU_FEATURE_REQUIRE)) ||
         !(cpu_force = x86ModelFromCPU(cpu, map, VIR_CPU_FEATURE_FORCE)) ||
         !(cpu_require = x86ModelFromCPU(cpu, map, VIR_CPU_FEATURE_REQUIRE)) ||
         !(cpu_optional = x86ModelFromCPU(cpu, map, VIR_CPU_FEATURE_OPTIONAL)) ||
@@ -1611,7 +1612,7 @@ x86Baseline(virCPUDefPtr *cpus,
     if (!(map = x86LoadMap()))
         goto error;
 
-    if (!(base_model = x86ModelFromCPU(cpus[0], map, 0)))
+    if (!(base_model = x86ModelFromCPU(cpus[0], map, VIR_CPU_FEATURE_REQUIRE)))
         goto error;
 
     if (VIR_ALLOC(cpu) < 0 ||
@@ -1630,7 +1631,7 @@ x86Baseline(virCPUDefPtr *cpus,
     for (i = 1; i < ncpus; i++) {
         const char *vn = NULL;
 
-        if (!(model = x86ModelFromCPU(cpus[i], map, 0)))
+        if (!(model = x86ModelFromCPU(cpus[i], map, VIR_CPU_FEATURE_REQUIRE)))
             goto error;
 
         if (cpus[i]->vendor && model->vendor &&
@@ -1710,7 +1711,7 @@ x86Update(virCPUDefPtr guest,
     union cpuData *data = NULL;
 
     if (!(map = x86LoadMap()) ||
-        !(host_model = x86ModelFromCPU(host, map, 0)))
+        !(host_model = x86ModelFromCPU(host, map, VIR_CPU_FEATURE_REQUIRE)))
         goto cleanup;
 
     for (i = 0; i < guest->nfeatures; i++) {