fix(ps5): use scheduler SMT evidence even without readable CPU topology CPUID [core-ready] [full-build] [test-all-on]

headless/performance.cpp

@@ -245,8 +245,9 @@ void CheckWorkerTopology() {
     topology_allowed = original;
     topology_allowed_valid = true;
     if (!has_x2apic && !has_amd_topology) {
-        std::printf("EDEN_WORKER_TOPOLOGY ready=0 reason=no_supported_physical_cpuid\n");
-        return;
+        // This is not yet a failure: the kernel may still expose authoritative
+        // SMT groups even when neither architectural CPUID leaf is usable.
+        std::printf("EDEN_PS5_CPU_CPUID unavailable=1 trying_kernel_topology=1\n");
     }
     // The PS5's FreeBSD scheduler may expose genuine SMT sibling groups
     // even when CPUID per-affinity yields bogus 13-core/one-core readings.

tools/check-worker-affinity.py

@@ -151,6 +151,20 @@ int main(){
         "<flags><flag name=\"SMT\"></flag></flags></group></groups>";
  CheckWorkerTopology();
  assert(!worker_topology_ready && current==0x1fff);
+ // Kernel topology must also work when no CPUID topology exists.
+ max_leaf=0xa;amd_vendor=false;amd_ext_feature=false;
+ os_xml="<groups>";
+ for(unsigned i=0;i<14;i+=2) {
+  char pair[160];
+  std::snprintf(pair,sizeof(pair),
+    "<group><cpu count=\"2\" mask=\"%llx,0,0\">pair</cpu>"
+    "<flags><flag name=\"SMT\">SMT group</flag></flags></group>",
+    (unsigned long long)(3ULL<<i));
+  os_xml+=pair;
+ }
+ os_xml+="</groups>";
+ CheckWorkerTopology();
+ assert(worker_topology_ready && current==0x1fff);
  os_xml.clear();
  max_leaf=0xa;
  // TopologyExtensions absent: do not claim proof from logical IDs alone.