Merge tag 'kvm-x86-mmu-6.19' of https://github.com/kvm-x86/linux into HEAD

KVM x86 MMU changes for 6.19:

 - Skip the costly "zap all SPTEs" on an MMIO generation wrap if MMIO SPTE
   caching is disabled, as there can't be any relevant SPTEs to zap.

 - Relocate a misplace export.

Author: bonzini

arch/x86/kvm/mmu/mmu.c

@@ -6863,6 +6863,7 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
 
 	write_unlock(&kvm->mmu_lock);
 }
+EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_zap_gfn_range);
 
 static bool slot_rmap_write_protect(struct kvm *kvm,
 				    struct kvm_rmap_head *rmap_head,
@@ -7204,7 +7205,6 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
 
 	return need_tlb_flush;
 }
-EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_zap_gfn_range);
 
 static void kvm_rmap_zap_collapsible_sptes(struct kvm *kvm,
 					   const struct kvm_memory_slot *slot)
@@ -7364,6 +7364,9 @@ void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, u64 gen)
 {
 	WARN_ON_ONCE(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS);
 
+	if (!enable_mmio_caching)
+		return;
+
 	gen &= MMIO_SPTE_GEN_MASK;
 
 	/*