Try matching on the last core

acidanthera · Jul 17, 2021 · 37ff126 · 37ff126
1 parent 814662f
commit 37ff126
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/CpuTscSync/VoodooTSCSync.cpp b/CpuTscSync/VoodooTSCSync.cpp
@@ -49,8 +49,10 @@ IOService* VoodooTSCSync::probe(IOService* provider, SInt32* score)
     if (!cpuNumber) return NULL;
 
     if (getKernelVersion() >= KernelVersion::Monterey) {
-        if (cpuNumber->unsigned16BitValue() != 0) return NULL;
-        SYSLOG("cputs", "discovered cpu with %llu threads, syncing", rdmsr64(MSR_CORE_THREAD_COUNT));
+        // only attach to last CPU
+        uint16_t threadCount = rdmsr64(MSR_CORE_THREAD_COUNT);
+        if (cpuNumber->unsigned16BitValue() != threadCount-1) return NULL;
+        SYSLOG("cputs", "discovered cpu with %u threads, matching last, syncing", threadCount);
         mp_rendezvous_no_intrs(stamp_tsc_new, NULL);
         SYSLOG("cputs", "done syncing");
         tsc_synced = true;