Merge tag 'kvm-x86-gmem-6.19' of https://github.com/kvm-x86/linux into HEAD

Merge tag 'kvm-x86-gmem-6.19' of https://github.com/kvm-x86/linux into HEAD

KVM guest_memfd changes for 6.19:

 - Add NUMA mempolicy support for guest_memfd, and clean up a variety of
   rough edges in guest_memfd along the way.

 - Define a CLASS to automatically handle get+put when grabbing a guest_memfd
   from a memslot to make it harder to leak references.

 - Enhance KVM selftests to make it easer to develop and debug selftests like
   those added for guest_memfd NUMA support, e.g. where test and/or KVM bugs
   often result in hard-to-debug SIGBUS errors.

 - Misc cleanups.