Re: [Qemu-discuss] qemu -cpu host

[Vincenzo Romano]

Which version of qemu are you using?
Which version of the kernel are you running?

--
Vincenzo Romano - NotOrAnd.IT
Information Technologies
--
NON QVIETIS MARIBVS NAVTA PERITVS


2017-02-06 12:19 GMT+01:00 akhilesh rawat <address@hidden>:
> address@hidden qemu]# /usr/libexec/qemu-kvm -cpu help
> x86           qemu64  QEMU Virtual CPU version 1.5.3
> x86           phenom  AMD Phenom(tm) 9550 Quad-Core Processor
> x86         core2duo  Intel(R) Core(TM)2 Duo CPU     T7700  @ 2.40GHz
> x86            kvm64  Common KVM processor
> x86           qemu32  QEMU Virtual CPU version 1.5.3
> x86            kvm32  Common 32-bit KVM processor
> x86          coreduo  Genuine Intel(R) CPU           T2600  @ 2.16GHz
> x86              486
> x86          pentium
> x86         pentium2
> x86         pentium3
> x86           athlon  QEMU Virtual CPU version 1.5.3
> x86             n270  Intel(R) Atom(TM) CPU N270   @ 1.60GHz
> x86      cpu64-rhel6  QEMU Virtual CPU version (cpu64-rhel6)
> x86           Conroe  Intel Celeron_4x0 (Conroe/Merom Class Core 2)
> x86           Penryn  Intel Core 2 Duo P9xxx (Penryn Class Core 2)
> x86          Nehalem  Intel Core i7 9xx (Nehalem Class Core i7)
> x86         Westmere  Westmere E56xx/L56xx/X56xx (Nehalem-C)
> x86      SandyBridge  Intel Xeon E312xx (Sandy Bridge)
> x86          Haswell  Intel Core Processor (Haswell)
> x86        Broadwell  Intel Core Processor (Broadwell)
> x86   Skylake-Client  Intel Core Processor (Skylake)
> x86       Opteron_G1  AMD Opteron 240 (Gen 1 Class Opteron)
> x86       Opteron_G2  AMD Opteron 22xx (Gen 2 Class Opteron)
> x86       Opteron_G3  AMD Opteron 23xx (Gen 3 Class Opteron)
> x86       Opteron_G4  AMD Opteron 62xx class CPU
> x86       Opteron_G5  AMD Opteron 63xx class CPU
> x86             host  KVM processor with all supported host features (only
> available in KVM mode)
>
> Recognized CPUID flags:
>   pbe ia64 tm ht ss sse2 sse fxsr mmx acpi ds clflush pn pse36 pat cmov mca
> pge mtrr sep apic cx8 mce pae msr tsc pse de vme fpu
>   hypervisor rdrand f16c avx osxsave xsave aes tsc-deadline popcnt movbe
> x2apic sse4.2|sse4_2 sse4.1|sse4_1 dca pcid pdcm xtpr cx16 fma cid ssse3 tm2
> est smx vmx ds_cpl monitor dtes64 pclmulqdq|pclmuldq pni|sse3
>   avx512vl avx512bw avx512cd avx512er avx512pf avx512ifma smap adx rdseed
> avx512dq avx512f mpx rtm invpcid erms bmi2 smep avx2 hle bmi1 fsgsbase
>   avx512vbmi
>   3dnow 3dnowext lm|i64 rdtscp pdpe1gb fxsr_opt|ffxsr mmxext nx|xd syscall
>   perfctr_nb perfctr_core topoext tbm nodeid_msr tce fma4 lwp wdt skinit xop
> ibs osvw 3dnowprefetch misalignsse sse4a abm cr8legacy extapic svm
> cmp_legacy lahf_lm
>   pmm-en pmm phe-en phe ace2-en ace2 xcrypt-en xcrypt xstore-en xstore
>   kvm_pv_unhalt kvm_pv_eoi kvm_steal_time kvm_asyncpf kvmclock kvm_mmu
> kvm_nopiodelay kvmclock
>   pfthreshold pause_filter decodeassists flushbyasid vmcb_clean tsc_scale
> nrip_save svm_lock lbrv npt
>   xgetbv1 xsavec xsaveopt
>
>
> On Mon, Feb 6, 2017 at 4:45 PM, akhilesh rawat <address@hidden>
> wrote:
>>
>> thanks , but if you see the guest which was run as
>>
>> qemu -cpu host
>>
>>
>> has auto generated model as SandyBridge in KVM process.
>>
>>  usr/libexec/qemu-kvm -name compute-0 -S -machine
>> pc-i440fx-rhel7.0.0,accel=kvm,usb=off -cpu
>> SandyBridge,+vme,+ds,+acpi,+ss,+ht,+tm,+pbe,+dtes64,+monitor,+ds_cpl,+vmx,+smx,+est,+tm2,+xtpr,+pdcm,+pcid,+dca,+osxsave,+arat,+xsaveopt,+pdpe1gb
>> -m 61440
>>
>> So now  running  "--cpu SandyBridge" will make any difference
>>
>>
>>
>>
>> On Mon, Feb 6, 2017 at 4:28 PM, Vincenzo Romano
>> <address@hidden> wrote:
>>>
>>> 2017-02-06 11:36 GMT+01:00 akhilesh rawat <address@hidden>:
>>> >
>>> > processor    : 19
>>> > vendor_id    : GenuineIntel
>>> > cpu family    : 6
>>> > model        : 42
>>>
>>> Hmmm. your guest CPU is a different model form the host one.
>>>
>>> Would you please:
>>>
>>> - try forcing "SandyBridge" cpu (that'd be your Intel Xeon E312xx)
>>> instead of host and
>>> - check the "Recognized CPUID flags" from the output of
>>> "qemu-system-x86_64 -cpu help" ?
>>>
>>> --
>>> Vincenzo Romano - NotOrAnd.IT
>>> Information Technologies
>>> --
>>> NON QVIETIS MARIBVS NAVTA PERITVS
>>
>>
>