Changeset 21353 in vbox

Timestamp:

Jul 7, 2009 3:59:53 PM (16 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

49702

Message:

CPUID: correct core count encoding

File:

• trunk/src/VBox/VMM/CPUM.cpp (modified) (1 diff)

trunk/src/VBox/VMM/CPUM.cpp

@@ -427 +427 @@
         AssertReturn(pVM->cCPUs <= 64, VERR_TOO_MANY_CPUS);
         /* One logical processor with possibly multiple cores. */
-        pCPUM->aGuestCpuIdStd[4].eax |= (pVM->cCPUs << 26);   /* 6 bits only -> 64 cores! */
+        /* See  http://www.intel.com/Assets/PDF/appnote/241618.pdf p. 29 */
+        pCPUM->aGuestCpuIdStd[4].eax |= ((pVM->cCPUs - 1) << 26);   /* 6 bits only -> 64 cores! */
     }
 #endif