AMD Erratum 383 crashes FreeBSD 9-Stable

[Richard Yao]

On 03/17/12 15:21, Alan Cox wrote:
> When the FreeBSD kernel detects that it is running on an affected
> processor, it automatically enables the recommended workaround.  However,
> because you are running within a virtual machine, the automatic detection
> may not be working.  Alternatively, you may be using a newer processor
> revision that still suffers from the bug, but the kernel doesn't enable the
> workaround for.  Can you tell us how the FreeBSD guest sees the underlying
> processor, e.g., the first few lines of dmesg from the guest?
> 
> Alan
> 

I am currently passing "-cpu
Opteron_G3,+3dnowext,+3dnow,+3dnowprefetch,+cmp_legacy" to KVM at
libvirtd's suggestion. I assume this is why the workaround is not being
triggered.

# dmesg
Copyright (c) 1992-2012 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 9.0-RELEASE #0: Sun Jan 15 22:48:55 UTC 2012
    root at zfsguru:/usr/obj/usr/src/sys/OFED amd64
module_register: module pci/mps already exists!
Module pci/mps failed to register: 17
CPU: AMD Opteron 23xx (Gen 3 Class Opteron) (3210.85-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0xf61  Family = f  Model = 6  Stepping = 1

Features=0x783fbfd<FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2>
  Features2=0x80802001<SSE3,CX16,POPCNT,HV>
  AMD Features=0xe0100800<SYSCALL,NX,LM,3DNow!+,3DNow!>
  AMD Features2=0x1e7<LAHF,CMP,SVM,ABM,SSE4A,MAS,Prefetch>

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