Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "s390:

   - Lots of small and not-so-small fixes for the newly rewritten gmap,
     mostly affecting the handling of nested guests.

  x86:

   - Fix an issue with shadow paging, which causes KVM to install an
     MMIO PTE in the shadow page tables without first zapping a non-MMIO
     SPTE if KVM didn't see the write that modified the shadowed guest
     PTE.

     While commit a54aa15c6bda3 ("KVM: x86/mmu: Handle MMIO SPTEs
     directly in mmu_set_spte()") was right about it being impossible to
     miss such a write if it was coming from the guest, it failed to
     account for writes to guest memory that are outside the scope of
     KVM: if userspace modifies the guest PTE, and then the guest hits a
     relevant page fault, KVM will get confused"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE
  KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE
  KVM: s390: Fix KVM_S390_VCPU_FAULT ioctl
  KVM: s390: vsie: Fix guest page tables protection
  KVM: s390: vsie: Fix unshadowing while shadowing
  KVM: s390: vsie: Fix refcount overflow for shadow gmaps
  KVM: s390: vsie: Fix nested guest memory shadowing
  KVM: s390: Correctly handle guest mappings without struct page
  KVM: s390: Fix gmap_link()
  KVM: s390: vsie: Fix check for pre-existing shadow mapping
  KVM: s390: Remove non-atomic dat_crstep_xchg()
  KVM: s390: vsie: Fix dat_split_ste()

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