From ac3daf0899cced61faeeed3c6e14806d9e846174 Mon Sep 17 00:00:00 2001
From: Jiri Denemark <jdenemar@redhat.com>
Date: Mon, 12 Jul 2010 14:41:36 +0200
Subject: [PATCH] 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.
---
 src/cpu/cpu_x86.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index 114235c770..ab7c8cc77e 100644
--- 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++) {