KVM: arm64: Handle guest_memfd()-backed guest page faults

Add arm64 support for handling guest page faults on guest_memfd
backed memslots.

For now, the fault granule is restricted to PAGE_SIZE.

Change-Id: I6d1b53392d5a4d659b5ed8189f6b62d04443642f
Signed-off-by: Fuad Tabba <tabba@google.com>
3 files changed