[$] Security topics: io_uring, VM attestation, and random-reseed notifications

The kernel-development community has recently been discussing a number of
independent patches, each of which is intended to help improve the security
of deployed systems in some way. They touch on a number of areas within the
kernel, including the question of how widely io_uring should be available,
how to allow virtual machines to attest to their integrity, and the best
way to inform applications when their random-number generators need to be
reseeded.