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| author | jhb <jhb@FreeBSD.org> | 2014-07-21 18:26:51 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2014-07-21 18:26:51 +0000 |
| commit | b164bf591711a4c455ca47e1f58b0bb91e5e904c (patch) | |
| tree | 41ae3f780dac5d6828aff870aae230b12fcece76 | |
| parent | 044fcd5dc21bf096ebbe9d9453510cd559ce0796 (diff) | |
| download | FreeBSD-src-b164bf591711a4c455ca47e1f58b0bb91e5e904c.zip FreeBSD-src-b164bf591711a4c455ca47e1f58b0bb91e5e904c.tar.gz | |
MFC 264347:
Account for the "plus 1" encoding of the CPUID Function 4 reported
core per package and cache sharing values.
| -rw-r--r-- | sys/amd64/vmm/x86.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sys/amd64/vmm/x86.c b/sys/amd64/vmm/x86.c index e81b43e..ef1557f 100644 --- a/sys/amd64/vmm/x86.c +++ b/sys/amd64/vmm/x86.c @@ -219,9 +219,18 @@ x86_emulate_cpuid(struct vm *vm, int vcpu_id, /* * 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: |
