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