Re: [Qemu-devel] DOS VM problem with QEMU-KVM and newer kernels

[Avi Kivity]

On 04/16/2012 03:18 PM, Gerhard Wiesinger wrote:
>>> Right. But there is an erratum on K8 (only) which Kevin ran into. It is
>>> documented as Erratum 701 and the bug is that no EXITINTINFO is stored
>>> on a task-switch intercept on K8.
>>
>> Ah, so this could affect Gerhard.  Gerhard, what's your cpu
>> family/model/stepping from /proc/cpuinfo?
>
>
> Only CPU 0 of 3:
> processor       : 0
> vendor_id       : AuthenticAMD
> cpu family      : 16
> model           : 4
> model name      : AMD Phenom(tm) II X4 940 Processor
> stepping        : 2
> microcode       : 0x1000086
> cpu MHz         : 2999.912
> cache size      : 512 KB
> physical id     : 0
> siblings        : 4
> core id         : 0
> cpu cores       : 4
> apicid          : 0
> initial apicid  : 0
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 5
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
> fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl
> nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm
> extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit
> wdt hw_pstate npt lbrv svm_lock nrip_save
> bogomips        : 5999.82
> TLB size        : 1024 4K pages
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 48 bits physical, 48 bits virtual
> power management: ts ttp tm stc 100mhzsteps hwpstate
>
> part of cpuid, CPU 0:
>    vendor_id = "AuthenticAMD"
>    version information (1/eax):
>       processor type  = primary processor (0)
>       family          = Intel Pentium 4/Pentium D/Pentium Extreme
> Edition/Celeron/Xeon/Xeon MP/Itanium2, AMD Athlon 64/Athlon
> XP-M/Opteron/Sempron/Turion (15)
>       model           = 0x4 (4)
>       stepping id     = 0x2 (2)
>       extended family = 0x1 (1)
>       extended model  = 0x0 (0)
>       (simple synth)  = AMD Quad-Core Opteron (Shanghai RB-C2) /
> Embedded Opteron (Shanghai RB-C2) / Athlon Dual-Core (Regor / Propus
> RB-C2) / Phenom II (Callisto / Heka / Deneb RB-C2), 45nm
>    miscellaneous (1/ebx):
>       process local APIC physical ID = 0x0 (0)
>       cpu count                      = 0x4 (4)
>       CLFLUSH line size              = 0x8 (8)
>       brand index                    = 0x0 (0)
>    brand id = 0x00 (0): unknown

So it's not a K8; we're dealing with a kvm bug.

(if it's really the task switch - we'll know when you post the traces).

-- 
error compiling committee.c: too many arguments to function