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...d 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...

...rprised 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...

...as working good working with kvm management tools using libvirt . virsh/virt-manager . But then i got annoyed when management tool did not allow me to change the CPU model while creating new virtual machine . error root@kvm-server qemu]# virt-install --virt-type kvm --name compute-2 --cpu Haswell-noTSX --ram=61440 --vcpus=20 --os-type=linux --os-variant=generic --disk compute2-disk0.qcow2,device=disk,bus=ide,size=300,sparse=true,format=qcow2 --pxe --network bridge=virbr0,model=e1000 --network bridge=virbr0,model=e1000 --network bridge=virbr0,model=virtio --network bridge=virbr0,model=virtio --gra...

...another test. Here I used libvirt's 'host-model' for both source and destination L1 guests, _and_ for L2 guest. Migrated the L2 to destination L1, worked great. In my setup, both my L1 guests recieved the following CPU configuration (in QEMU command-line): [...] -cpu Haswell-noTSX,vme=on,ss=on,vmx=on,f16c=on,rdrand=on,\ hypervisor=on,arat=on,tsc_adjust=on,xsaveopt=on,pdpe1gb=on,abm=on,aes=off [...] And the L2 guest recieved this: [...] -cpu Haswell-noTSX,vme=on,ss=on,f16c=on,rdrand=on,hypervisor=on,\ arat=on,tsc_adjust=on,xsaveopt=on,pdpe1gb=on,abm=on,a...

...<model usable='yes'>IvyBridge</model> > >> > <model usable='no'>Icelake-Server</model> > >> > <model usable='no'>Icelake-Client</model> > >> > <model usable='yes'>Haswell-noTSX-IBRS</model> > >> > <model usable='yes'>Haswell-noTSX</model> > >> > <model usable='yes'>Haswell-IBRS</model> > >> > <model usable='yes'>Haswell</model> > >> > <m...

...Does my VM config look reasonable for the latest releases of windows? Are there features I should be using that will help performance? > 2. Why does the hypervclock timer make so much performance difference in windows VMs? > 3. Does my virtualized CPU model make sense? I defined Haswell-noTSX-IBRS and libvirt added the features. > 4. Which kernel branch offers the best stability and performance? > 5. Are there performance gains in using UEFI booting the windows guest and defining ?<blockio logical_block_size='4096' physical_block_size='4096'/>?? Perhaps...

...n i got annoyed when management tool did not allow me to change the >> CPU model while creating new virtual machine . >> error >> >> > Are we talking about the same host? > > root@kvm-server qemu]# virt-install --virt-type kvm --name compute-2 --cpu >> Haswell-noTSX --ram=61440 --vcpus=20 --os-type=linux --os-variant=generic >> --disk >> compute2-disk0.qcow2,device=disk,bus=ide,size=300,sparse=tru >> e,format=qcow2 >> --pxe --network bridge=virbr0,model=e1000 --network >> bridge=virbr0,model=e1000 --network bridge=virbr0,model=vir...

...1. Does my VM config look reasonable for the latest releases of windows? Are there features I should be using that will help performance? 2. Why does the hypervclock timer make so much performance difference in windows VMs? 3. Does my virtualized CPU model make sense? I defined Haswell-noTSX-IBRS and libvirt added the features. 4. Which kernel branch offers the best stability and performance? 5. Are there performance gains in using UEFI booting the windows guest and defining “<blockio logical_block_size='4096' physical_block_size='4096'/>”? Perhaps better b...

...lt;/nvram> >> </os> >> <features> >> <acpi/> >> <apic/> >> <pae/> >> </features> >> <cpu mode='custom' match='exact'> >> <model fallback='allow'>Haswell-noTSX</model> >> </cpu> >> <clock offset='utc'> >> <timer name='rtc' tickpolicy='catchup'/> >> <timer name='pit' tickpolicy='delay'/> >> <timer name='hpet' present='no'/&...

...ate (in the kernel) is broken that hard, that even a reset cannot fix it. > > I've now changed my L2 guest's CPU configuration so that libvirt (in > L1) starts the L2 guest with the following settings: > > <cpu> > <model fallback='forbid'>Haswell-noTSX</model> > <vendor>Intel</vendor> > <feature policy='disable' name='vme'/> > <feature policy='disable' name='ss'/> > <feature policy='disable' name='f16c'/> > <feature policy=...

...oader> <nvram>/var/lib/libvirt/qemu/nvram/fedora22_VARS.fd</nvram> </os> <features> <acpi/> <apic/> <pae/> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>Haswell-noTSX</model> </cpu> <clock offset='utc'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='no'/> </clock> <on_poweroff>des...

.... >Also, I can mount an ISO and reinstall once secureboot is enabled. > >XML is at the bottom. > >LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin >QEMU_AUDIO_DRV=spice /usr/bin/qemu-kvm -name passthrough -S -machine >pc-i440fx-2.3,accel=kvm,usb=off -cpu Haswell-noTSX -drive >file=/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd,if=pflash,format=raw,unit=0,readonly=on >-drive >file=/var/lib/libvirt/qemu/nvram/passthrough_VARS.fd,if=pflash,format=raw,unit=1 >-m 2048 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid >ffd15ea4-03dc-4e86-...

...ally from virsh/virt-manager. Also, I can mount an ISO and reinstall once secureboot is enabled. XML is at the bottom. LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=spice /usr/bin/qemu-kvm -name passthrough -S -machine pc-i440fx-2.3,accel=kvm,usb=off -cpu Haswell-noTSX -drive file=/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd,if=pflash,format=raw,unit=0,readonly=on -drive file=/var/lib/libvirt/qemu/nvram/passthrough_VARS.fd,if=pflash,format=raw,unit=1 -m 2048 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid ffd15ea4-03dc-4e86-ae93-096e517055a8 -n...

...stall once secureboot is >> enabled. >> >> XML is at the bottom. >> >> LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin >> QEMU_AUDIO_DRV=spice /usr/bin/qemu-kvm -name passthrough -S >> -machine pc-i440fx-2.3,accel=kvm,usb=off -cpu Haswell-noTSX >> -drive >> file=/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd,if=pflash,format=raw,unit=0,readonly=on >> >> >> -drive >> file=/var/lib/libvirt/qemu/nvram/passthrough_VARS.fd,if=pflash,format=raw,unit=1 >> >> >> -m 2048 -realtime mlock=...

...009) pc-q35-2.4 Standard PC (Q35 + ICH9, 2009) isapc ISA-only PC none empty machine xenfv Xen Fully-virtualized PC xenpv Xen Para-virtualized PC *$> kvm -cpu help* Available CPUs: x86 486 x86 Broadwell-noTSX Intel Core Processor (Broadwell, no TSX) x86 Broadwell Intel Core Processor (Broadwell) x86 Conroe Intel Celeron_4x0 (Conroe/Merom Class Core 2) x86 Haswell-noTSX Intel Core Processor (Haswell, no TSX) x86 Haswell Intel Core Processor (Haswell) x86 IvyB...

...virsh/virt-manager . > >But then i got annoyed when management tool did not allow me to change the >CPU model while creating new virtual machine . >error > Are we talking about the same host? >root@kvm-server qemu]# virt-install --virt-type kvm --name compute-2 --cpu >Haswell-noTSX --ram=61440 --vcpus=20 --os-type=linux --os-variant=generic >--disk >compute2-disk0.qcow2,device=disk,bus=ide,size=300,sparse=true,format=qcow2 >--pxe --network bridge=virbr0,model=e1000 --network >bridge=virbr0,model=e1000 --network bridge=virbr0,model=virtio --network >bridge=virbr...

...? Thinkpad W530) and the new laptop is a Broadwell > (Thinkpad P70). [A side note on Broadwell CPUs, you might've noticed by now: Intel released a microcode update to remove TSX; if you're using the model without the TSX, your guest hypervisor (L1) should be using the CPU model Haswell-noTSX.] > I've tried to loading vhost_net without much luck. What is preventing you from loading `vhost_net`? Assuming VHOST_NET is compiled in your Kernel, `sudo modprobe vhost_net` fails for you? If so, in what way? On Fedora 23, it is compiled in by default: $ grep CONFIG_VHOST_NET...

...: guest and host CPU are not compatible: Host CPU does not provide required features: fma, x2apic, movbe, tsc-deadline, xsave, osxsave, avx, f16c, rdrand, fsgsbase, tsc_adjust, bmi1, hle, avx2, smep, bmi2, erms, invpcid, rtm, rdseed, adx, smap, xsaveopt, abm, 3dnowprefetch; try using 'Broadwell-noTSX' CPU model. LibVirt appears to be comparing the source and destination host CPUs, instead of guest VM and destination host CPUs. The VM is configured with a common set CPU features that are compatible with both (see below) and can run on both hosts without issue. The hosts have Westmere and B...

...to that, a virsh destroy/virsh start cycle does fix things. >> I've now changed my L2 guest's CPU configuration so that libvirt (in >> L1) starts the L2 guest with the following settings: >> >> <cpu> >> <model fallback='forbid'>Haswell-noTSX</model> >> <vendor>Intel</vendor> >> <feature policy='disable' name='vme'/> >> <feature policy='disable' name='ss'/> >> <feature policy='disable' name='f16c'/> >> &l...

...irt/qemu/nvram/fedora22_VARS.fd</nvram> > </os> > <features> > <acpi/> > <apic/> > <pae/> > </features> > <cpu mode='custom' match='exact'> > <model fallback='allow'>Haswell-noTSX</model> > </cpu> > <clock offset='utc'> > <timer name='rtc' tickpolicy='catchup'/> > <timer name='pit' tickpolicy='delay'/> > <timer name='hpet' present='no'/> > </cloc...