[Bug 246168] Ubuntu 20.04 KVM / QEMU Failure with nested FreeBSD bhyve

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246168

--- Comment #7 from John Hartley <drum at graphica.com.au> ---
Hi Peter & Co,

I reviewed the prior bug report and FYI here is some additional information on
my machine:

<<START LAYER 1 - FreeBSD CPU Report from dmesg.boot>>
...
...
CPU: Intel Core Processor (Broadwell, IBRS) (2600.09-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x306d2  Family=0x6  Model=0x3d  Stepping=2
 
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=0x121<LAHF,ABM,Prefetch>
  Structured Extended
Features=0x1c0fbb<FSGSBASE,TSCADJ,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM,RDSEED,ADX,SMAP>
  Structured Extended Features2=0x4<UMIP>
  Structured Extended Features3=0xac000400<MD_CLEAR,IBPB,STIBP,ARCH_CAP,SSBD>
  XSAVE Features=0x1<XSAVEOPT>
  IA32_ARCH_CAPS=0x8<SKIP_L1DFL_VME>
  AMD Extended Feature Extensions ID EBX=0x1001000
  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID,VID,PostIntr
Hypervisor: Origin = "KVMKVMKVM"
...
...
<END LAYER 1 - dimes.log>>


I also did cpuctl load and here are result from cpucontrol

(I am not sure how to interpret these or if provided vectors are still valid
with FreeBSD 12.1)

<<START CPUCTL>>
# kldload cpuctl
# 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: 0x00037bff 0x00000000
# cpucontrol -m 0x48c /dev/cpuctl0
MSR 0x48c: 0x00000f01 0x06334041
<<END CPUCTL>>

I also saw that in the original but, it appear that issue was that the bhyve
KLM was not loading.

I my case the vmm module is loading but I am getting runtime failure...

Any tips you can provide to help with diagnosis would be appreciated and I can
chase upstream if needed, if this is KVM regression.

Thanks.


John Hartley

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