1. the vm's qemu cmd line string that created by libvirt is as follow:
/usr/bin/kvm -name 2012r2-DC-cattest -S -machine pc-i440fx-1.5,accel=kvm,usb=off -m 16384 -smp 4,maxcpus=24,sockets=24,cores=1,threads=1 -uuid 95a0e2e4-c615-4a1c-a8de-d50d29bc6bab -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/2012r2-DC-cattest.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime,clock=vm,driftfix=slew -no-hpet -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device usb-ehci,id=ehci,bus=pci.0,addr=0x4 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive file=/vms/dwnw2/2012r2-DC-cattest,if=none,id=drive-virtio-disk0,format=qcow2,cache=directsync -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=/vms/isos/virtio-win2012-0.1.52.vfd,if=none,id=drive-fdc0-0-0,readonly=on,format=raw,cache=directsync -global isa-fdc.driveA=drive-fdc0-0-0 -drive file=/vms/isos/petst.iso,if=none,id=drive-ide0-0-0,readonly=on,format=raw,cache=directsync -device ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=2 -netdev tap,fd=24,id=hostnet0,vhost=on,vhostfd=26 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=0c:da:41:1d:e4:f7,bus=pci.0,addr=0x3 -netdev tap,fd=27,id=hostnet1 -device rtl8139,netdev=hostnet1,id=net1,mac=0c:da:41:1d:c7:1c,bus=pci.0,addr=0x8 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/2012r2-DC-cattest.agent,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -device usb-tablet,id=input0,bus=usb.0 -vnc 0.0.0.0:0 -device VGA,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7
2. the cpuinfo of HP DL580G7 is as follow: