diff --git a/hw/pci.c b/hw/pci.c
index 44bb3b9a91cf7694b917c10b1cb83e3e53354021..d0b51b80bdb1ae936986e46b08136bfc5729773a 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -2014,17 +2014,43 @@ static char *pcibus_get_fw_dev_path(DeviceState *dev)
 
 static char *pcibus_get_dev_path(DeviceState *dev)
 {
-    PCIDevice *d = (PCIDevice *)dev;
-    char path[16];
-
-    snprintf(path, sizeof(path), "%04x:%02x:%02x.%x",
-             pci_find_domain(d->bus),
-             0 /* TODO: need a persistent path for nested buses.
-                * Note: pci_bus_num(d->bus) is not right as it's guest
-                * assigned. */,
-             PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
-
-    return strdup(path);
+    PCIDevice *d = container_of(dev, PCIDevice, qdev);
+    PCIDevice *t;
+    int slot_depth;
+    /* Path format: Domain:00:Slot.Function:Slot.Function....:Slot.Function.
+     * 00 is added here to make this format compatible with
+     * domain:Bus:Slot.Func for systems without nested PCI bridges.
+     * Slot.Function list specifies the slot and function numbers for all
+     * devices on the path from root to the specific device. */
+    int domain_len = strlen("DDDD:00");
+    int slot_len = strlen(":SS.F");
+    int path_len;
+    char *path, *p;
+
+    /* Calculate # of slots on path between device and root. */;
+    slot_depth = 0;
+    for (t = d; t; t = t->bus->parent_dev) {
+        ++slot_depth;
+    }
+
+    path_len = domain_len + slot_len * slot_depth;
+
+    /* Allocate memory, fill in the terminating null byte. */
+    path = malloc(path_len + 1 /* For '\0' */);
+    path[path_len] = '\0';
+
+    /* First field is the domain. */
+    snprintf(path, domain_len, "%04x:00", pci_find_domain(d->bus));
+
+    /* Fill in slot numbers. We walk up from device to root, so need to print
+     * them in the reverse order, last to first. */
+    p = path + path_len;
+    for (t = d; t; t = t->bus->parent_dev) {
+        p -= slot_len;
+        snprintf(p, slot_len, ":%02x.%x", PCI_SLOT(t->devfn), PCI_FUNC(d->devfn));
+    }
+
+    return path;
 }
 
 static int pci_qdev_find_recursive(PCIBus *bus,