[libvirt-users] LibVirt query CPU Model support and restore operation

[akhilesh rawat]

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 at 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
>
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