[Bug 232081] 12.0-BETA8 crashes under 11.2+Bhyve on Phenom-II (unemulated clflush [ebx])

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232081

            Bug ID: 232081
           Summary: 12.0-BETA8 crashes under 11.2+Bhyve on Phenom-II
                    (unemulated clflush [ebx])
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: phk at FreeBSD.org

12.0-ALPHA8 on Phenom-II crashes with unemulated "clflush BYTE PTR [ebx]


Host:
-----
        FreeBSD 11.2-RELEASE-p4 FreeBSD 11.2-RELEASE-p4 #0: Thu Sep 27 08:16:24
UTC 2018 amd64

        CPU: AMD Phenom(tm) II X6 1075T Processor (3013.98-MHz K8-class CPU)
          Origin="AuthenticAMD"  Id=0x100fa0  Family=0x10  Model=0xa 
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=0x802009<SSE3,MON,CX16,POPCNT>
          AMD
Features=0xee500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM,3DNow!+,3DNow!>
          AMD
Features2=0x837ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,SKINIT,WDT,NodeId>
          SVM: NP,NRIP,NAsids=64
          TSC: P-state invariant, performance statistics
        real memory  = 34359738368 (32768 MB)
        avail memory = 33279193088 (31737 MB)

Guest:
------
        12.0-ALPHA8-amd64-20180928-r338991


Result:
-------

        Host:
        -----

                Launching virtual machine "vm14_fbsd" ...
                Failed to emulate instruction [0x0f 0xae 0x3b 0x8b 0x04 0x25
0xf8 0x5d 0xb8 0x81 0x48 0x01 0xc3 0x4c 0x39] at 0xffffffff8104abb0

        Guest:
        ------
                CPU: AMD Phenom(tm) II X6 1075T Processor (3013.42-MHz K8-class
CPU)
                  Origin="AuthenticAMD"  Id=0x100fa0  Family=0x10  Model=0xa 
Stepping=0
                 
Features=0x1783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,HTT>
                  Features2=0x80802001<SSE3,CX16,POPCNT,HV>
                  AMD
Features=0xe6500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,LM,3DNow!+,3DNow!>
                  AMD
Features2=0x31fb<LAHF,CMP,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,SKINIT,WDT>
                  TSC: P-state invariant
                [...]
                ACPI APIC Table: <BHYVE  BVMADT  >
                FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
                FreeBSD/SMP: 4 package(s) x 1 core(s)
                arc4random: no preloaded entropy cache

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