virsh start centos.xml报错：Could not access KVM kernel module: Permission denied 2020-03-06T10:43:32.626226Z qemu-kvm: failed to initialize KVM: Permission denied

     解决方法：

     #vi /etc/libvirt/qemu.conf

     #去掉user=root和group=root前面的注释

     #重启libvirtd（systemctl restart libvirtd）