现象:

error: Failed to define domain from vhost_user_blk1.xml
error: operation failed: domain ‘vhostgw-vm’ already exists with uuid 08bdf402-2cd5-4aa7-bcfb-7588d6903b87

error: Failed to start domain vhostgw-vm
error: internal error: qemu unexpectedly closed the monitor: 2021-07-28T12:12:20.738024Z qemu-kvm: -object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu/78-vhostgw-vm,share=yes,size=8920236032: can’t open backing store /dev/hugepages/libvirt/qemu/78-vhostgw-vm for guest RAM: Permission denied

error: The domain is not running

解决办法:
/dev/hugepages /dev/hugepages/libvirt/qemu 这文件夹要挂在大页内存的