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Hello libvirt-users, I have an issue with libvirt on Centos 7.2 regarding CPU features seen by the Guest OS. The physical Host is Dell PowerEdge R730 with Haswell CPU, with the following features $ grep "model name" /proc/cpuinfo | tail -1 model name : Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz $ grep flags /proc/cpuinfo | tail -1 flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm xsaveopt cqm_llc cqm_occup_llc Regarding libvirt configuration, we have the following features detected : $ virsh capabilities | grep feature <feature name='invtsc'/> <feature name='abm'/> <feature name='pdpe1gb'/> <feature name='rdrand'/> <feature name='f16c'/> <feature name='osxsave'/> <feature name='dca'/> <feature name='pdcm'/> <feature name='xtpr'/> <feature name='tm2'/> <feature name='est'/> <feature name='smx'/> <feature name='vmx'/> <feature name='ds_cpl'/> <feature name='monitor'/> <feature name='dtes64'/> <feature name='pbe'/> <feature name='tm'/> <feature name='ht'/> <feature name='ss'/> <feature name='acpi'/> <feature name='ds'/> <feature name='vme'/> We have created a VM named that is configured with match="exact" $ virsh dumpxml compil | grep -A2 match <cpu mode='custom' match='exact'> <model fallback='allow'>Haswell-noTSX</model> </cpu> However, on the guest side, there no feature such as f16c is detected $ grep flag /proc/cpuinfo | tail -1 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 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx hypervisor lahf_lm fsgsbase bmi1 avx2 smep bmi2 erms invpcid xsaveopt Is this normal ? Should we use match="strict" to have the f16c feature seen by the guest OS ? The xml file describing both the host and the guest are in attachment. $ yum info libvirt Modules complémentaires chargés : fastestmirror Loading mirror speeds from cached hostfile Paquets installés Nom : libvirt Architecture : x86_64 Version : 1.2.17 Révision : 13.el7_2.4 Taille : 0.0 Dépôt : installed Depuis le dépôt : updates Résumé : Library providing a simple virtualization API URL : http://libvirt.org/ Licence : LGPLv2+ Description : Libvirt is a C toolkit to interact with the virtualization capabilities : of recent versions of Linux (and other OSes). The main package includes : the libvirtd server exporting the virtualization support. Thanks in advance for any advices we can receive. Best regards, Laurent Pouilloux -- Ingénieur en Calcul Scientifique Laboratoire de Mécanique des Fluides et d'Acoustique École Centrale de Lyon 36 Avenue Guy de Collongue, 69130 Écully Batiment I11 - Bureau 11097W Tél : 04.72.18.61.57 |
<domain type='kvm' id='9'>
<name>compil</name>
<uuid>67a217f9-4447-4963-b566-70c639e2552d</uuid>
<memory unit='KiB'>67108864</memory>
<currentMemory unit='KiB'>67108864</currentMemory>
<vcpu placement='static'>16</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
</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>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/mnt/vms/compil.img'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<alias name='usb'/>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<alias name='usb'/>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<alias name='usb'/>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<alias name='pci.0'/>
</controller>
<controller type='virtio-serial' index='0'>
<alias name='virtio-serial0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:a0:2a:16'/>
<source bridge='br0'/>
<target dev='vnet3'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/5'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/5'>
<source path='/dev/pts/5'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<channel type='unix'>
<source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-compil/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0' state='disconnected'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='tablet' bus='usb'>
<alias name='input0'/>
</input>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x83' slot='0x00' function='0x4'/>
</source>
<alias name='hostdev0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</hostdev>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</memballoon>
</devices>
</domain>
<capabilities>
<host>
<uuid>44454c4c-5200-1044-8058-c7c04f473632</uuid>
<cpu>
<arch>x86_64</arch>
<model>Haswell-noTSX</model>
<vendor>Intel</vendor>
<topology sockets='1' cores='8' threads='2'/>
<feature name='invtsc'/>
<feature name='abm'/>
<feature name='pdpe1gb'/>
<feature name='rdrand'/>
<feature name='f16c'/>
<feature name='osxsave'/>
<feature name='dca'/>
<feature name='pdcm'/>
<feature name='xtpr'/>
<feature name='tm2'/>
<feature name='est'/>
<feature name='smx'/>
<feature name='vmx'/>
<feature name='ds_cpl'/>
<feature name='monitor'/>
<feature name='dtes64'/>
<feature name='pbe'/>
<feature name='tm'/>
<feature name='ht'/>
<feature name='ss'/>
<feature name='acpi'/>
<feature name='ds'/>
<feature name='vme'/>
<pages unit='KiB' size='4'/>
<pages unit='KiB' size='2048'/>
<pages unit='KiB' size='1048576'/>
</cpu>
<power_management>
<suspend_mem/>
<suspend_disk/>
<suspend_hybrid/>
</power_management>
<migration_features>
<live/>
<uri_transports>
<uri_transport>tcp</uri_transport>
<uri_transport>rdma</uri_transport>
</uri_transports>
</migration_features>
<topology>
<cells num='2'>
<cell id='0'>
<memory unit='KiB'>67003624</memory>
<pages unit='KiB' size='4'>16750906</pages>
<pages unit='KiB' size='2048'>0</pages>
<pages unit='KiB' size='1048576'>0</pages>
<distances>
<sibling id='0' value='10'/>
<sibling id='1' value='21'/>
</distances>
<cpus num='16'>
<cpu id='0' socket_id='0' core_id='0' siblings='0,16'/>
<cpu id='2' socket_id='0' core_id='1' siblings='2,18'/>
<cpu id='4' socket_id='0' core_id='2' siblings='4,20'/>
<cpu id='6' socket_id='0' core_id='3' siblings='6,22'/>
<cpu id='8' socket_id='0' core_id='4' siblings='8,24'/>
<cpu id='10' socket_id='0' core_id='5' siblings='10,26'/>
<cpu id='12' socket_id='0' core_id='6' siblings='12,28'/>
<cpu id='14' socket_id='0' core_id='7' siblings='14,30'/>
<cpu id='16' socket_id='0' core_id='0' siblings='0,16'/>
<cpu id='18' socket_id='0' core_id='1' siblings='2,18'/>
<cpu id='20' socket_id='0' core_id='2' siblings='4,20'/>
<cpu id='22' socket_id='0' core_id='3' siblings='6,22'/>
<cpu id='24' socket_id='0' core_id='4' siblings='8,24'/>
<cpu id='26' socket_id='0' core_id='5' siblings='10,26'/>
<cpu id='28' socket_id='0' core_id='6' siblings='12,28'/>
<cpu id='30' socket_id='0' core_id='7' siblings='14,30'/>
</cpus>
</cell>
<cell id='1'>
<memory unit='KiB'>67108864</memory>
<pages unit='KiB' size='4'>16777216</pages>
<pages unit='KiB' size='2048'>0</pages>
<pages unit='KiB' size='1048576'>0</pages>
<distances>
<sibling id='0' value='21'/>
<sibling id='1' value='10'/>
</distances>
<cpus num='16'>
<cpu id='1' socket_id='1' core_id='0' siblings='1,17'/>
<cpu id='3' socket_id='1' core_id='1' siblings='3,19'/>
<cpu id='5' socket_id='1' core_id='2' siblings='5,21'/>
<cpu id='7' socket_id='1' core_id='3' siblings='7,23'/>
<cpu id='9' socket_id='1' core_id='4' siblings='9,25'/>
<cpu id='11' socket_id='1' core_id='5' siblings='11,27'/>
<cpu id='13' socket_id='1' core_id='6' siblings='13,29'/>
<cpu id='15' socket_id='1' core_id='7' siblings='15,31'/>
<cpu id='17' socket_id='1' core_id='0' siblings='1,17'/>
<cpu id='19' socket_id='1' core_id='1' siblings='3,19'/>
<cpu id='21' socket_id='1' core_id='2' siblings='5,21'/>
<cpu id='23' socket_id='1' core_id='3' siblings='7,23'/>
<cpu id='25' socket_id='1' core_id='4' siblings='9,25'/>
<cpu id='27' socket_id='1' core_id='5' siblings='11,27'/>
<cpu id='29' socket_id='1' core_id='6' siblings='13,29'/>
<cpu id='31' socket_id='1' core_id='7' siblings='15,31'/>
</cpus>
</cell>
</cells>
</topology>
<secmodel>
<model>none</model>
<doi>0</doi>
</secmodel>
<secmodel>
<model>dac</model>
<doi>0</doi>
<baselabel type='kvm'>+107:+107</baselabel>
<baselabel type='qemu'>+107:+107</baselabel>
</secmodel>
</host>
<guest>
<os_type>hvm</os_type>
<arch name='i686'>
<wordsize>32</wordsize>
<emulator>/usr/bin/qemu-system-i386</emulator>
<machine maxCpus='255'>pc-i440fx-2.0</machine>
<machine canonical='pc-i440fx-2.0' maxCpus='255'>pc</machine>
<machine maxCpus='255'>pc-0.12</machine>
<machine maxCpus='255'>pc-1.3</machine>
<machine maxCpus='255'>pc-q35-1.6</machine>
<machine maxCpus='255'>pc-q35-1.5</machine>
<machine maxCpus='255'>pc-i440fx-1.6</machine>
<machine maxCpus='255'>pc-i440fx-1.7</machine>
<machine maxCpus='255'>pc-0.11</machine>
<machine maxCpus='255'>pc-0.10</machine>
<machine maxCpus='255'>pc-1.2</machine>
<machine maxCpus='1'>isapc</machine>
<machine maxCpus='255'>pc-q35-1.4</machine>
<machine maxCpus='255'>pc-0.15</machine>
<machine maxCpus='255'>pc-0.14</machine>
<machine maxCpus='255'>pc-i440fx-1.5</machine>
<machine maxCpus='255'>pc-q35-2.0</machine>
<machine canonical='pc-q35-2.0' maxCpus='255'>q35</machine>
<machine maxCpus='255'>pc-i440fx-1.4</machine>
<machine maxCpus='255'>pc-1.1</machine>
<machine maxCpus='255'>pc-q35-1.7</machine>
<machine maxCpus='255'>pc-1.0</machine>
<machine maxCpus='255'>pc-0.13</machine>
<domain type='qemu'/>
<domain type='kvm'>
<emulator>/usr/libexec/qemu-kvm</emulator>
<machine maxCpus='240'>pc-i440fx-rhel7.0.0</machine>
<machine canonical='pc-i440fx-rhel7.0.0' maxCpus='240'>pc</machine>
<machine maxCpus='240'>rhel6.0.0</machine>
<machine maxCpus='240'>rhel6.1.0</machine>
<machine maxCpus='240'>rhel6.2.0</machine>
<machine maxCpus='240'>rhel6.3.0</machine>
<machine maxCpus='240'>rhel6.4.0</machine>
<machine maxCpus='240'>rhel6.5.0</machine>
<machine maxCpus='240'>rhel6.6.0</machine>
</domain>
</arch>
<features>
<cpuselection/>
<deviceboot/>
<disksnapshot default='on' toggle='no'/>
<acpi default='on' toggle='yes'/>
<apic default='on' toggle='no'/>
<pae/>
<nonpae/>
</features>
</guest>
<guest>
<os_type>hvm</os_type>
<arch name='x86_64'>
<wordsize>64</wordsize>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<machine maxCpus='255'>pc-i440fx-2.0</machine>
<machine canonical='pc-i440fx-2.0' maxCpus='255'>pc</machine>
<machine maxCpus='255'>pc-1.3</machine>
<machine maxCpus='255'>pc-0.12</machine>
<machine maxCpus='255'>pc-q35-1.6</machine>
<machine maxCpus='255'>pc-q35-1.5</machine>
<machine maxCpus='255'>pc-i440fx-1.6</machine>
<machine maxCpus='255'>pc-i440fx-1.7</machine>
<machine maxCpus='255'>pc-0.11</machine>
<machine maxCpus='255'>pc-1.2</machine>
<machine maxCpus='255'>pc-0.10</machine>
<machine maxCpus='1'>isapc</machine>
<machine maxCpus='255'>pc-q35-1.4</machine>
<machine maxCpus='255'>pc-0.15</machine>
<machine maxCpus='255'>pc-0.14</machine>
<machine maxCpus='255'>pc-i440fx-1.5</machine>
<machine maxCpus='255'>pc-i440fx-1.4</machine>
<machine maxCpus='255'>pc-q35-2.0</machine>
<machine canonical='pc-q35-2.0' maxCpus='255'>q35</machine>
<machine maxCpus='255'>pc-1.1</machine>
<machine maxCpus='255'>pc-q35-1.7</machine>
<machine maxCpus='255'>pc-1.0</machine>
<machine maxCpus='255'>pc-0.13</machine>
<domain type='qemu'/>
<domain type='kvm'>
<emulator>/usr/libexec/qemu-kvm</emulator>
<machine maxCpus='240'>pc-i440fx-rhel7.0.0</machine>
<machine canonical='pc-i440fx-rhel7.0.0' maxCpus='240'>pc</machine>
<machine maxCpus='240'>rhel6.0.0</machine>
<machine maxCpus='240'>rhel6.1.0</machine>
<machine maxCpus='240'>rhel6.2.0</machine>
<machine maxCpus='240'>rhel6.3.0</machine>
<machine maxCpus='240'>rhel6.4.0</machine>
<machine maxCpus='240'>rhel6.5.0</machine>
<machine maxCpus='240'>rhel6.6.0</machine>
</domain>
</arch>
<features>
<cpuselection/>
<deviceboot/>
<disksnapshot default='on' toggle='no'/>
<acpi default='on' toggle='yes'/>
<apic default='on' toggle='no'/>
</features>
</guest>
</capabilities>
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