Merge tag 'kvm-x86-mmu-7.4' of https://github.com/kvm-x86/linux into HEAD

KVM x86 MMU changes for 7.4

 - Grab KVM's SRCU "lock" in kvm_zap_gfn_range() to fix a recurring bug where
   callers fail to do so.

 - Fix a variety of issues in the pre-fault code that are mostly benign in the
   current code base, but will show up in big ways if/when the pre-faulting
   logic is used to implementing prefetch-on-fault for the TDP MMU.

 - Guard rmaps with mmu_lock for PREEMPT_RT=y kernels to fix a longstanding
   issue introducing by "lockless aging" where KVM would take its effective
   raw bit-spinlock with preemption enabled (because mmu_lock gets turned into
   a sleepable lock).

 - Prepare a memory_fault exit (paired with -EFAULT) when KVM hits an error
   PFN, e.g. so that userspace can resolve transient issues instead of killing
   the guest.  Convert a variety of WARN()+EFAULT paths into KVM_BUG_ON()+EIO
   so that KVM can hard commit to filling memory_fault on -EFAULTs that occur
   in the page fault path.

 - Fix a NX hugepage un-accounting bug where KVM would always uncharge the
   shadow MMU, even when handling TDP MMU pages.

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