machine: Put all sanity-check in the generic SMP parser

Put both sanity-check of the input SMP configuration and sanity-check
of the output SMP configuration uniformly in the generic parser. Then
machine_set_smp() will become cleaner, also all the invalid scenarios
can be tested only by calling the parser.

Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@ionos.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20210929025816.21076-16-wangyanan55@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 30 insertions, 32 deletions

diff --git a/hw/core/machine.c b/hw/core/machine.c
index d49ebc2..3920a2f 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -799,6 +799,20 @@ static void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp)
     unsigned maxcpus = config->has_maxcpus ? config->maxcpus : 0;
 
     /*
+     * Specified CPU topology parameters must be greater than zero,
+     * explicit configuration like "cpus=0" is not allowed.
+     */
+    if ((config->has_cpus && config->cpus == 0) ||
+        (config->has_sockets && config->sockets == 0) ||
+        (config->has_dies && config->dies == 0) ||
+        (config->has_cores && config->cores == 0) ||
+        (config->has_threads && config->threads == 0) ||
+        (config->has_maxcpus && config->maxcpus == 0)) {
+        warn_report("Deprecated CPU topology (considered invalid): "
+                    "CPU topology parameters must be greater than zero");
+    }
+
+    /*
      * If not supported by the machine, a topology parameter must be
      * omitted or specified equal to 1.
      */
@@ -873,6 +887,22 @@ static void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp)
                    topo_msg, maxcpus, cpus);
         return;
     }
+
+    if (ms->smp.cpus < mc->min_cpus) {
+        error_setg(errp, "Invalid SMP CPUs %d. The min CPUs "
+                   "supported by machine '%s' is %d",
+                   ms->smp.cpus,
+                   mc->name, mc->min_cpus);
+        return;
+    }
+
+    if (ms->smp.max_cpus > mc->max_cpus) {
+        error_setg(errp, "Invalid SMP CPUs %d. The max CPUs "
+                   "supported by machine '%s' is %d",
+                   ms->smp.max_cpus,
+                   mc->name, mc->max_cpus);
+        return;
+    }
 }
 
 static void machine_get_smp(Object *obj, Visitor *v, const char *name,
@@ -895,46 +925,14 @@ static void machine_get_smp(Object *obj, Visitor *v, const char *name,
 static void machine_set_smp(Object *obj, Visitor *v, const char *name,
                             void *opaque, Error **errp)
 {
-    MachineClass *mc = MACHINE_GET_CLASS(obj);
     MachineState *ms = MACHINE(obj);
     g_autoptr(SMPConfiguration) config = NULL;
-    ERRP_GUARD();
 
     if (!visit_type_SMPConfiguration(v, name, &config, errp)) {
         return;
     }
 
-    /*
-     * Specified CPU topology parameters must be greater than zero,
-     * explicit configuration like "cpus=0" is not allowed.
-     */
-    if ((config->has_cpus && config->cpus == 0) ||
-        (config->has_sockets && config->sockets == 0) ||
-        (config->has_dies && config->dies == 0) ||
-        (config->has_cores && config->cores == 0) ||
-        (config->has_threads && config->threads == 0) ||
-        (config->has_maxcpus && config->maxcpus == 0)) {
-        warn_report("Deprecated CPU topology (considered invalid): "
-                    "CPU topology parameters must be greater than zero");
-    }
-
     smp_parse(ms, config, errp);
-    if (*errp) {
-        return;
-    }
-
-    /* sanity-check smp_cpus and max_cpus against mc */
-    if (ms->smp.cpus < mc->min_cpus) {
-        error_setg(errp, "Invalid SMP CPUs %d. The min CPUs "
-                   "supported by machine '%s' is %d",
-                   ms->smp.cpus,
-                   mc->name, mc->min_cpus);
-    } else if (ms->smp.max_cpus > mc->max_cpus) {
-        error_setg(errp, "Invalid SMP CPUs %d. The max CPUs "
-                   "supported by machine '%s' is %d",
-                   ms->smp.max_cpus,
-                   mc->name, mc->max_cpus);
-    }
 }
 
 static void machine_class_init(ObjectClass *oc, void *data)