[Bug 203994] bhyve kernel module may need to relax some checks when running nested under KVM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203994

--- Comment #10 from Roman Bogorodskiy <novel at FreeBSD.org> ---
(In reply to Peter Grehan from comment #9)

Here's what I have in FreeBSD (12-CURRENT as of Feb 22 2017) inside KVM (Fedora
25):

# cpucontrol -m 0x480 /dev/cpuctl0
MSR 0x480: 0x00d81000 0x11e57ed0
# cpucontrol -m 0x482 /dev/cpuctl0
MSR 0x482: 0xfff9fffe 0x0401e172
# cpucontrol -m 0x48b /dev/cpuctl0
MSR 0x48b: 0x000000fb 0x00000000
# cpucontrol -m 0x48c /dev/cpuctl0
MSR 0x48c: 0x00000601 0x06114041
# 

in case if could be useful, cpu part of dmesg looks like this:


CPU: Intel(R) Core(TM) i5-4690 CPU @ 3.50GHz (3492.07-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x306c3  Family=0x6  Model=0x3c  Stepping=3
 
Features=0xf83fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,SS>
 
Features2=0xfffa3223<SSE3,PCLMULQDQ,VMX,SSSE3,FMA,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND,HV>
  AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
  AMD Features2=0x21<LAHF,ABM>
  Structured Extended Features=0x72a<TSCADJ,BMI1,AVX2,BMI2,ERMS,INVPCID>
  XSAVE Features=0x1<XSAVEOPT>
  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID
Hypervisor: Origin = "KVMKVMKVM"

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