* Elliot Berman [off-list ref] [2023-02-14 13:24:26]:

+static int gh_vm_start(struct gh_vm *ghvm)
+{
+	struct gh_vm_mem *mapping;
+	u64 dtb_offset;
+	u32 mem_handle;
+	int ret;
+
+	down_write(&ghvm->status_lock);
+	if (ghvm->vm_status != GH_RM_VM_STATUS_LOAD) {
+		up_write(&ghvm->status_lock);
+		return 0;
+	}
+
+	ghvm->vm_status = GH_RM_VM_STATUS_RESET;
+
+	list_for_each_entry(mapping, &ghvm->memory_mappings, list) {
+		switch (mapping->share_type) {
+		case VM_MEM_LEND:
+			ret = gh_rm_mem_lend(ghvm->rm, &mapping->parcel);
+			break;
+		case VM_MEM_SHARE:
+			ret = gh_rm_mem_share(ghvm->rm, &mapping->parcel);
+			break;
+		}
+		if (ret) {
+			pr_warn("Failed to %s parcel %d: %d\n",
+				mapping->share_type == VM_MEM_LEND ? "lend" : "share",
+				mapping->parcel.label,
+				ret);
+			goto err;
+		}
+	}
+
+	mapping = gh_vm_mem_find_mapping(ghvm, ghvm->dtb_config.gpa, ghvm->dtb_config.size);

It may be some optimization to derive DTB 'mapping' in the first loop you have
above (that lends/shares all mappings)

+	if (!mapping) {
+		pr_warn("Failed to find the memory_handle for DTB\n");
+		ret = -EINVAL;
+		goto err;
+	}

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