hi ,

yes you were correct . Model should as per qemu-kvm binary. thanks .
 /usr/libexec/qemu-kvm -name compute-0 -S -machine pc-i440fx-rhel7.0.0,accel=kvm,usb=off -cpu Haswell,+rtm,+hle -m 61440 -realtime mlock=off

This time KVM is invked with cpu model HAswell.

Also  from proc

rocessor    : 19
vendor_id    : GenuineIntel
cpu family    : 6
model        : 60
model name    : Intel Core Processor (Haswell)
stepping    : 1
microcode    : 0x1
cpu MHz        : 1995.110
cache size    : 4096 KB
fpu        : yes
fpu_exception    : yes
cpuid level    : 13
wp        : yes
flags        : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx rdtscp lm constant_tsc rep_good nopl eagerfpu pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx hypervisor lahf_lm xsaveopt



Akhilesh


On Fri, Jan 27, 2017 at 3:23 PM, Jiri Denemark <jdenemar@redhat.com> wrote:
On Fri, Jan 27, 2017 at 13:48:44 +0530, akhilesh rawat wrote:
> hello ,
>
> thanks for comments .
>
> I tried now with force options for CPU flag which were not supported . Now
> the command with non fully supported CPU model gets executed ,  But i am
> surprised to see that still Guest  cpu model is not changed and still same
> as host cpu model(SAndy Bridge)
>
> Why don't i see the model as HAswell now , could you please comment.
>
> Command used :
>
> virt-install --virt-type kvm --name controller-0  --cpu
> Haswell-noTSX,+fma,+movbe,+fsgsbase,+bmi1,+avx2,+smep,+bmi2,+erms,+invpcid
> --ram=8120 --vcpus=4,sockets=1
>
> Linux process for KVM :
>
> 7479     1 37 10:13 ?        01:13:21 /usr/libexec/qemu-kvm -name
> controller-0 -S -machine pc-i440fx-rhel7.0.0,accel=kvm,usb=off *-cpu
> SandyBridge,*+fma,+pcid,+movbe,+fsgsbase,+bmi1,+avx2,+smep,+bmi2,+erms,+invpcid
> -m 8120 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1

Your qemu-kvm binary apparently doesn't know what Haswell-noTSX is and
thus libvirt has to translate it to something QEMU understands. You can
check supported CPU models with "/usr/libexec/qemu-kvm -cpu ?" (make
sure the question mark is not expanded by the shell).

Jirka