Author: tychon
Date: Fri Apr 11 18:19:21 2014
New Revision: 264347
URL: http://svnweb.freebsd.org/changeset/base/264347
Log:
Account for the "plus 1" encoding of the CPUID Function 4 reported
core per package and cache sharing values.
Approved by: grehan (co-mentor)
Modified:
head/sys/amd64/vmm/x86.c
Modified: head/sys/amd64/vmm/x86.c
==============================================================================
--- head/sys/amd64/vmm/x86.c Fri Apr 11 16:55:25 2014 (r264346)
+++ head/sys/amd64/vmm/x86.c Fri Apr 11 18:19:21 2014 (r264347)
@@ -219,9 +219,18 @@ x86_emulate_cpuid(struct vm *vm, int vcp
/*
* Do not expose topology.
+ *
+ * The maximum number of processor cores in
+ * this physical processor package and the
+ * maximum number of threads sharing this
+ * cache are encoded with "plus 1" encoding.
+ * Adding one to the value in this register
+ * field to obtains the actual value.
+ *
+ * Therefore 0 for both indicates 1 core per
+ * package and no cache sharing.
*/
regs[0] &= 0xffff8000;
- regs[0] |= 0x04008000;
break;
case CPUID_0000_0007:
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