You can do so even per-size via e.g. 
/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
As discussed the later the allocation the higher the chance to fail, so 
re-check the sysfs file after each change if it actually got that much memory.

The default size is only a boot time parameter.
But you can specify explicit sizes in libvirt xml.

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https://bugs.launchpad.net/bugs/1838575

Title:
  passthrough devices cause >17min boot delay

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