diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c
index 22f0c74455af..d4561e368cd5 100644
--- a/arch/arm64/kvm/rme.c
+++ b/arch/arm64/kvm/rme.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/kvm_host.h>
+#include <linux/hugetlb.h>
 
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_mmu.h>
@@ -545,6 +546,236 @@ void kvm_realm_unmap_range(struct kvm *kvm, unsigned long start, u64 size,
 		realm_unmap_private_range(kvm, start, end);
 }
 
+static int realm_create_protected_data_page(struct realm *realm,
+					    unsigned long ipa,
+					    kvm_pfn_t dst_pfn,
+					    kvm_pfn_t src_pfn,
+					    unsigned long flags)
+{
+	phys_addr_t dst_phys, src_phys;
+	int ret;
+
+	dst_phys = __pfn_to_phys(dst_pfn);
+	src_phys = __pfn_to_phys(src_pfn);
+
+	if (rmi_granule_delegate(dst_phys))
+		return -ENXIO;
+
+	ret = rmi_data_create(virt_to_phys(realm->rd), dst_phys, ipa, src_phys,
+			      flags);
+
+	if (RMI_RETURN_STATUS(ret) == RMI_ERROR_RTT) {
+		/* Create missing RTTs and retry */
+		int level = RMI_RETURN_INDEX(ret);
+
+		ret = realm_create_rtt_levels(realm, ipa, level,
+					      RMM_RTT_MAX_LEVEL, NULL);
+		if (ret)
+			goto err;
+
+		ret = rmi_data_create(virt_to_phys(realm->rd), dst_phys, ipa,
+				      src_phys, flags);
+	}
+
+	if (!ret)
+		return 0;
+
+err:
+	if (WARN_ON(rmi_granule_undelegate(dst_phys))) {
+		/* Page can't be returned to NS world so is lost */
+		get_page(pfn_to_page(dst_pfn));
+	}
+	return -ENXIO;
+}
+
+static int fold_rtt(struct realm *realm, unsigned long addr, int level)
+{
+	phys_addr_t rtt_addr;
+	int ret;
+
+	ret = realm_rtt_fold(realm, addr, level + 1, &rtt_addr);
+	if (ret)
+		return ret;
+
+	free_delegated_granule(rtt_addr);
+
+	return 0;
+}
+
+static int populate_par_region(struct kvm *kvm,
+			       phys_addr_t ipa_base,
+			       phys_addr_t ipa_end,
+			       u32 flags)
+{
+	struct realm *realm = &kvm->arch.realm;
+	struct kvm_memory_slot *memslot;
+	gfn_t base_gfn, end_gfn;
+	int idx;
+	phys_addr_t ipa;
+	int ret = 0;
+	unsigned long data_flags = 0;
+
+	base_gfn = gpa_to_gfn(ipa_base);
+	end_gfn = gpa_to_gfn(ipa_end);
+
+	if (flags & KVM_ARM_RME_POPULATE_FLAGS_MEASURE)
+		data_flags = RMI_MEASURE_CONTENT;
+
+	idx = srcu_read_lock(&kvm->srcu);
+	memslot = gfn_to_memslot(kvm, base_gfn);
+	if (!memslot) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	/* We require the region to be contained within a single memslot */
+	if (memslot->base_gfn + memslot->npages < end_gfn) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (!kvm_slot_can_be_private(memslot)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	write_lock(&kvm->mmu_lock);
+
+	ipa = ipa_base;
+	while (ipa < ipa_end) {
+		struct vm_area_struct *vma;
+		unsigned long map_size;
+		unsigned int vma_shift;
+		unsigned long offset;
+		unsigned long hva;
+		struct page *page;
+		bool writeable;
+		kvm_pfn_t pfn;
+		int level, i;
+
+		hva = gfn_to_hva_memslot(memslot, gpa_to_gfn(ipa));
+		vma = vma_lookup(current->mm, hva);
+		if (!vma) {
+			ret = -EFAULT;
+			break;
+		}
+
+		/* FIXME: Currently we only support 4k sized mappings */
+		vma_shift = PAGE_SHIFT;
+
+		map_size = 1 << vma_shift;
+
+		ipa = ALIGN_DOWN(ipa, map_size);
+
+		switch (map_size) {
+		case RMM_L2_BLOCK_SIZE:
+			level = 2;
+			break;
+		case PAGE_SIZE:
+			level = 3;
+			break;
+		default:
+			WARN_ONCE(1, "Unsupported vma_shift %d", vma_shift);
+			ret = -EFAULT;
+			break;
+		}
+
+		pfn = __kvm_faultin_pfn(memslot, gpa_to_gfn(ipa), FOLL_WRITE,
+					&writeable, &page);
+
+		if (is_error_pfn(pfn)) {
+			ret = -EFAULT;
+			break;
+		}
+
+		if (level < RMM_RTT_MAX_LEVEL) {
+			/*
+			 * A temporary RTT is needed during the map, precreate
+			 * it, however if there is an error (e.g. missing
+			 * parent tables) this will be handled in the
+			 * realm_create_protected_data_page() call.
+			 */
+			realm_create_rtt_levels(realm, ipa, level,
+						RMM_RTT_MAX_LEVEL, NULL);
+		}
+
+		for (offset = 0, i = 0; offset < map_size && !ret;
+		     offset += PAGE_SIZE, i++) {
+			phys_addr_t page_ipa = ipa + offset;
+			kvm_pfn_t priv_pfn;
+			struct page *gmem_page;
+			int order;
+
+			ret = kvm_gmem_get_pfn(kvm, memslot,
+					       page_ipa >> PAGE_SHIFT,
+					       &priv_pfn, &gmem_page, &order);
+			if (ret)
+				break;
+
+			ret = realm_create_protected_data_page(realm, page_ipa,
+							       priv_pfn,
+							       pfn + i,
+							       data_flags);
+		}
+
+		kvm_release_faultin_page(kvm, page, false, false);
+
+		if (ret)
+			break;
+
+		if (level == 2)
+			fold_rtt(realm, ipa, level);
+
+		ipa += map_size;
+	}
+
+	write_unlock(&kvm->mmu_lock);
+
+out:
+	srcu_read_unlock(&kvm->srcu, idx);
+	return ret;
+}
+
+static int kvm_populate_realm(struct kvm *kvm,
+			      struct kvm_cap_arm_rme_populate_realm_args *args)
+{
+	phys_addr_t ipa_base, ipa_end;
+
+	if (kvm_realm_state(kvm) != REALM_STATE_NEW)
+		return -EINVAL;
+
+	if (!IS_ALIGNED(args->populate_ipa_base, PAGE_SIZE) ||
+	    !IS_ALIGNED(args->populate_ipa_size, PAGE_SIZE))
+		return -EINVAL;
+
+	if (args->flags & ~RMI_MEASURE_CONTENT)
+		return -EINVAL;
+
+	ipa_base = args->populate_ipa_base;
+	ipa_end = ipa_base + args->populate_ipa_size;
+
+	if (ipa_end < ipa_base)
+		return -EINVAL;
+
+	/*
+	 * Perform the populate in parts to ensure locks are not held for too
+	 * long
+	 */
+	while (ipa_base < ipa_end) {
+		phys_addr_t end = min(ipa_end, ipa_base + SZ_2M);
+
+		int ret = populate_par_region(kvm, ipa_base, end,
+					      args->flags);
+
+		if (ret)
+			return ret;
+
+		ipa_base = end;
+	}
+
+	return 0;
+}
+
 int realm_set_ipa_state(struct kvm_vcpu *vcpu,
 			unsigned long start,
 			unsigned long end,
@@ -794,6 +1025,18 @@ int kvm_realm_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
 		r = kvm_init_ipa_range_realm(kvm, &args);
 		break;
 	}
+	case KVM_CAP_ARM_RME_POPULATE_REALM: {
+		struct kvm_cap_arm_rme_populate_realm_args args;
+		void __user *argp = u64_to_user_ptr(cap->args[1]);
+
+		if (copy_from_user(&args, argp, sizeof(args))) {
+			r = -EFAULT;
+			break;
+		}
+
+		r = kvm_populate_realm(kvm, &args);
+		break;
+	}
 	default:
 		r = -EINVAL;
 		break;
