Merge branch 'kvm-fixes-for-5.18-rc5' into HEAD

Fixes for (relatively) old bugs, to be merged in both the -rc and next
development trees.

The merge reconciles the ABI fixes for KVM_EXIT_SYSTEM_EVENT between
5.18 and commit c24a950e ("KVM, SEV: Add KVM_EXIT_SHUTDOWN metadata
for SEV-ES", 2022-04-13).