AMD Erratum 383 crashes FreeBSD 9-Stable

[Richard Yao]

Alan, thanks for the information.

This is a definitely libvirtd bug. Passing '-cpu host' fixes the
problem. I replaced libvirtd with Gentoo's kvm-tools, which makes it
easy to specify this, so problem solved.

I would send a report to the libvirt developers, but I have encountered
more problems in libvirt than I have time to describe, so that will not
happen right away.

On 03/17/12 15:39, Richard Yao wrote:
> 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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