Bhyve on AMD CPUs under 10-STABLE?

[Paul Mather]

Does bhyve work on AMD CPUs under 10-STABLE?  I rebuilt my system 
yesterday (to r269010) but the bhyve module does not appear to load 
properly.  I get this on the console when I kldload vmm:

=====
amdv_init: not implemented
amdv_cleanup: not implemented
module_register_init: MOD_LOAD (vmm, 0xffffffff81c1a590, 0) error 6
=====

The system has a 6-core AMD FX-6300 CPU:

=====
FreeBSD 10.0-STABLE #0 r269010: Wed Jul 23 08:25:27 EDT 2014
    paul at chumby.chumby.lan:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
CPU: AMD FX(tm)-6300 Six-Core Processor              (3515.86-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x600f20  Family = 0x15  Model = 0x2  Stepping = 0
  Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
  Features2=0x3e98320b<SSE3,PCLMULQDQ,MON,SSSE3,FMA,CX16,SSE4.1,SSE4.2,POPCNT,AESNI,XSAVE,OSXSAVE,AVX,F16C>
  AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
  AMD Features2=0x1ebbfff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,XOP,SKINIT,WDT,LWP,FMA4,TCE,NodeId,TBM,Topology,PCXC,PNXC>
  Structured Extended Features=0x8<BMI1>
  TSC: P-state invariant, performance statistics
real memory  = 8589934592 (8192 MB)
avail memory = 8225202176 (7844 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <042713 APIC1042>
FreeBSD/SMP: Multiprocessor System Detected: 6 CPUs
FreeBSD/SMP: 1 package(s) x 6 core(s)
[[...]]
=====

It has the POPCNT feature, which is the one the bhyve documentation 
says to look for.

Does bhyve only work on Intel CPUs for now?  Does anyone have it 
working on an AMD FX-6300-based 10-STABLE system?

Cheers,

Paul.