Merge tag 'kvm-x86-mmu-7.1' of https://github.com/kvm-x86/linux into HEAD

Merge tag 'kvm-x86-mmu-7.1' of https://github.com/kvm-x86/linux into HEAD

KVM x86 MMU changes for 7.1

 - Fix an undefined behavior warning where a crafty userspace can read kvm.ko's
   nx_huge_pages before it's fully initialized.

 - Don't zero-allocate page tables that are used for splitting hugepages in the
   TDP MMU, as KVM is guaranteed to set all SPTEs in the page table and thus
   write all bytes.

 - Bail early when trying to unsync 4KiB mappings if the target gfn can be
   mapped with a 2MiB hugepage, to avoid the gfn hash lookup.