On Fri, Oct 21, 2022, Chao Peng wrote:

quoted

In the context of userspace inaccessible memfd, what would be a
suggested way to enforce NUMA memory policy for physical memory
allocation? mbind[1] won't work here in absence of virtual address
range.

How about set_mempolicy():
https://www.man7.org/linux/man-pages/man2/set_mempolicy.2.html

Andy Lutomirski brought this up in an off-list discussion way back when the whole
private-fd thing was first being proposed.

  : The current Linux NUMA APIs (mbind, move_pages) work on virtual addresses.  If
  : we want to support them for TDX private memory, we either need TDX private
  : memory to have an HVA or we need file-based equivalents. Arguably we should add
  : fmove_pages and fbind syscalls anyway, since the current API is quite awkward
  : even for tools like numactl.