On 19.12.2014 18:33, Paolo Bonzini wrote:
>
>
> On 19/12/2014 16:44, poma wrote:
>> Mister Bonzini, what are these errors?
>
> They are harmless. Typically it means that the VM is trying to access
> registers for performance counters or machine check exceptions.
>
> Instead, this:
>
>> [ 125.880384] kvm: zapping shadow pages for mmio generation wraparound
>
> should be downgraded to KERN_DEBUG severity.
>
>> [ 4011.896698] kvm: zapping shadow pages for mmio generation wraparound
>> [ 4046.744577] kvm [4706]: vcpu0 unhandled rdmsr: 0xc0010112
>> [ 4046.815794] kvm [4706]: vcpu0 unhandled rdmsr: 0xc001100d
>> [ 4046.949092] kvm [4706]: vcpu0 unhandled rdmsr: 0xc0010001
>> [ 4046.962165] kvm [4706]: vcpu1 unhandled rdmsr: 0xc001100d
>>
>> Both Fedora 21 x64 host & Fedora 21 x64 guest are hosed, hard reset is must.
>
> It should not be hosed because of the rdmsr.
>
> What processor do you have in the host? Can you include the output of
> "ps | grep qemu"?
>
> Paolo
>
Eccola Mister Bonzini,
$ ps | grep qemu ; echo $?
1
$ ps axu | grep [q]emu ; echo $?
qemu 2347 101 1.6 2951384 63144 ? Sl 21:33 8:41
/usr/bin/qemu-system-x86_64 -machine accel=kvm -name Fedora21 -S -machine
pc-i440fx-2.1,accel=kvm,usb=off -cpu
Opteron_G3,+wdt,+skinit,+ibs,+osvw,+3dnowprefetch,+cr8legacy,+extapic,+cmp_legacy,+3dnow,+3dnowext,+pdpe1gb,+fxsr_opt,+mmxext,+ht,+vme
-m 2024 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 ...
0
/etc/libvirt/qemu/Fedora21.xml
...
<domain type='kvm'>
...
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.1'>hvm</type>
...
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<cpu mode='host-model'>
<model fallback='allow'/>
</cpu>
...
</domain>
HOST:
/proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 16
model : 4
model name : AMD Phenom(tm) II X4 955 Processor
stepping : 3
microcode : 0x10000c8
cpu MHz : 800.000
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 vmmcall
bugs : tlb_mmatch apic_c1e fxsave_leak
bogomips : 6400.37
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
...
"Phenom" doesn't exist in the /usr/share/libvirt/cpu_map.xml, therefore
libvirt? chooses probably the closest to specification,
and it is always Opteron_G3, even if cpu mode='host-passthrough'.
Is this the culprit, dunno, but both systems do have a tendency to "hose".
And this is nothing new, it is ongoing long since.
GUEST:
/proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 6
model name : AMD Opteron 23xx (Gen 3 Class Opteron)
stepping : 1
microcode : 0x1000065
cpu MHz : 3199.998
cache size : 512 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
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 syscall nx mmxext fxsr_opt pdpe1gb lm
3dnowext 3dnow rep_good nopl extd_apicid pni cx16 x2apic popcnt hypervisor
cmp_legacy svm cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw vmmcall
bugs : fxsave_leak
bogomips : 6399.99
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
...
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