virt使用cirros创建虚拟机失败记录

virt-manager使用cirros创建虚拟机失败，
出现错误代码
Booting from Hard Disk...
Boot failed: not a bootable disk
No bootable device.

解决方案
It appears that virt-manager does not read the hard drive image format of a pre-existing image when creating a new virtual machine and instead chooses the "raw" format. Since virt-manager seems to store it's setting internally, you cannot just edit the ~/.libvirt/qemu/VMNameHere.xml file.

You must export the libvirt vm settings to xml, fix the hard drive image formatting, and import the vm settings back into libvirt.

Export vm settings:
/etc/libvirt/qemu/vm.xml

virsh -c qemu:///session dumpxml VMName > ~/Desktop/VMName.xml

Update the hard drive format in the xml file:

From   

    /usr/bin/kvm
    
      
      
      
    
To

    /usr/bin/kvm
    
      
      
      
    

Import in the fixed xml file:

virsh -c qemu:///session define ~/Desktop/VMName.xml