diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 3f3db17231..c98af03f44 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -1417,6 +1417,27 @@ static void nvme_init_blk(NvmeCtrl *n, Error **errp)
                                   false, errp);
 }
 
+static void nvme_init_namespace(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
+{
+    int64_t bs_size;
+    NvmeIdNs *id_ns = &ns->id_ns;
+
+    bs_size = blk_getlength(n->conf.blk);
+    if (bs_size < 0) {
+        error_setg_errno(errp, -bs_size, "could not get backing file size");
+        return;
+    }
+
+    n->ns_size = bs_size;
+
+    id_ns->lbaf[0].ds = BDRV_SECTOR_BITS;
+    id_ns->nsze = cpu_to_le64(nvme_ns_nlbas(n, ns));
+
+    /* no thin provisioning */
+    id_ns->ncap = id_ns->nsze;
+    id_ns->nuse = id_ns->ncap;
+}
+
 static void nvme_realize(PCIDevice *pci_dev, Error **errp)
 {
     NvmeCtrl *n = NVME(pci_dev);
@@ -1424,7 +1445,6 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
     Error *local_err = NULL;
 
     int i;
-    int64_t bs_size;
     uint8_t *pci_conf;
 
     nvme_check_constraints(n, &local_err);
@@ -1435,12 +1455,6 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
 
     nvme_init_state(n);
 
-    bs_size = blk_getlength(n->conf.blk);
-    if (bs_size < 0) {
-        error_setg(errp, "could not get backing file size");
-        return;
-    }
-
     nvme_init_blk(n, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
@@ -1453,8 +1467,6 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
     pci_config_set_class(pci_dev->config, PCI_CLASS_STORAGE_EXPRESS);
     pcie_endpoint_cap_init(pci_dev, 0x80);
 
-    n->ns_size = bs_size / (uint64_t)n->num_namespaces;
-
     memory_region_init_io(&n->iomem, OBJECT(n), &nvme_mmio_ops, n,
                           "nvme", n->reg_size);
     pci_register_bar(pci_dev, 0,
@@ -1563,17 +1575,11 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
     }
 
     for (i = 0; i < n->num_namespaces; i++) {
-        NvmeNamespace *ns = &n->namespaces[i];
-        NvmeIdNs *id_ns = &ns->id_ns;
-        id_ns->nsfeat = 0;
-        id_ns->nlbaf = 0;
-        id_ns->flbas = 0;
-        id_ns->mc = 0;
-        id_ns->dpc = 0;
-        id_ns->dps = 0;
-        id_ns->lbaf[0].ds = BDRV_SECTOR_BITS;
-        id_ns->ncap  = id_ns->nuse = id_ns->nsze =
-            cpu_to_le64(nvme_ns_nlbas(n, ns));
+        nvme_init_namespace(n, &n->namespaces[i], &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+            return;
+        }
     }
 }