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I can reproduce with:libvirt-1.0.3-1.el7.x86_64.
Test pass with:libvirt-1.0.5-1.el7.x86_64

Steps:
1.Start a qemu guest.
2.Check the qemu-kvm command line,there is -machine accel=tcg added,so move the bug to VERIFIED.
# ps -ef |grep kvm
qemu       875     1  8 13:50 ?        00:00:06 /usr/libexec/qemu-kvm -name test -S -machine pc-i440fx-1.4,accel=tcg,usb=off -m 1024 -smp 1,sockets=1,cores=1,threads=1 -uuid 858064c9-5b54-4266-0c6e-79ca30477383 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/test.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/libvirt/images/test.img,if=none,id=drive-ide0-0-0,format=raw,cache=none -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=29,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:c0:84:2b,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -vnc 127.0.0.1:0 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4

I can reproduce with:libvirt-1.0.3-1.el7.x86_64. Test pass with:libvirt-1.0.5-1.el7.x86_64 Steps: 1.Start a qemu guest. 2.Check the qemu-kvm command line,there is -machine accel=tcg added,so move the bug to VERIFIED. # ps -ef |grep kvm qemu 875 1 8 13:50 ? 00:00:06 /usr/libexec/qemu-kvm -name test -S -machine pc-i440fx-1.4,accel=tcg,usb=off -m 1024 -smp 1,sockets=1,cores=1,threads=1 -uuid 858064c9-5b54-4266-0c6e-79ca30477383 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/test.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/libvirt/images/test.img,if=none,id=drive-ide0-0-0,format=raw,cache=none -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=29,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:c0:84:2b,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -vnc 127.0.0.1:0 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4