[Xen-users] Load Xen domU (guest) kernel over TFTP

[Camden Mannett <Camden.Mannett@xxxxxxx>]

I have a Xen dom0 instance that has its kernel and DTB loaded over TFTP (via a 
U-Boot script), and its root FS loaded over NFS. I would like any domU (guest) 
instances to behave the same, but I'm struggling to find out how to load over 
TFTP - for example:

    kernel      = "my_kernel"
    device_tree = "my_dt.dtb"
    name        = "guest1"
    memory      = 1024
    vcpus       = 2
    extra       = "rw nfsroot=192.168.0.1:/guest1,tcp,v3 earlyprintk=xenboot 
console=hvc0 ip=:::::eth0:dhcp"
    nfs_root    = "/guest1"
    nfs_server  = "10.32.209.10"
    root        = "/dev/nfs"
    dhcp        = 'dhcp'
    nics        = 1
    vif         = [ 'mac=aa:00:00:00:00:01' ]
    vfb         = [ 'type=vnc,vncdisplay=1' ]

Having the guest kernel and DTB loaded from dom0's filesystem works, but 
attempting to change the relevant paths to TFTP (xenpvnetboot style):

    kernel      = "tftp://192.168.0/1/my_kernel";
    device_tree = "tftp://192.168.0.1/my_dt.dtb";

This doesn't work. I can't use xenpvnetboot as it requires a ramdisk image, 
which I don't use.

Any ideas how I can load a kernel and DTB into a domU instance over TFTP?
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