diff --git a/hw/pci_host.c b/hw/pci_host.c
index 44c6c20..829d797 100644
--- a/hw/pci_host.c
+++ b/hw/pci_host.c
@@ -48,48 +48,50 @@ static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)
 }
 
 void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
-                                  uint32_t limit, uint32_t val, uint32_t len)
+                                  uint32_t val, uint32_t len)
 {
     assert(len <= 4);
-    pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
+    if ((addr + len) <= pci_config_size(pci_dev)) {
+        pci_dev->config_write(pci_dev, addr, val, len);
+    }
 }
 
 uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
-                                     uint32_t limit, uint32_t len)
+                                     uint32_t len)
 {
     assert(len <= 4);
-    return pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
+    if ((addr + len) <= pci_config_size(pci_dev)) {
+        return pci_dev->config_read(pci_dev, addr, len);
+    } else {
+        return ~0x0;
+    }
 }
 
 void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len)
 {
     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
-    uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
 
     if (!pci_dev) {
         return;
     }
 
     PCI_DPRINTF("%s: %s: addr=%02" PRIx32 " val=%08" PRIx32 " len=%d\n",
-                __func__, pci_dev->name, config_addr, val, len);
-    pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,
-                                 val, len);
+                __func__, pci_dev->name, addr, val, len);
+    pci_host_config_write_common(pci_dev, addr, val, len);
 }
 
 uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len)
 {
     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
-    uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
     uint32_t val;
 
     if (!pci_dev) {
         return ~0x0;
     }
 
-    val = pci_host_config_read_common(pci_dev, config_addr,
-                                      PCI_CONFIG_SPACE_SIZE, len);
+    val = pci_host_config_read_common(pci_dev, addr, len);
     PCI_DPRINTF("%s: %s: addr=%02"PRIx32" val=%08"PRIx32" len=%d\n",
-                __func__, pci_dev->name, config_addr, val, len);
+                __func__, pci_dev->name, addr, val, len);
 
     return val;
 }
diff --git a/hw/pci_host.h b/hw/pci_host.h
index 359e38f..4bb0838 100644
--- a/hw/pci_host.h
+++ b/hw/pci_host.h
@@ -42,9 +42,9 @@ struct PCIHostState {
 
 /* common internal helpers for PCI/PCIe hosts, cut off overflows */
 void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
-                                  uint32_t limit, uint32_t val, uint32_t len);
+                                  uint32_t val, uint32_t len);
 uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
-                                     uint32_t limit, uint32_t len);
+                                     uint32_t len);
 
 void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len);
 uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len);
diff --git a/hw/pcie_host.c b/hw/pcie_host.c
index 28bbe72..3af8610 100644
--- a/hw/pcie_host.c
+++ b/hw/pcie_host.c
@@ -60,19 +60,12 @@ static void pcie_mmcfg_data_write(void *opaque, target_phys_addr_t mmcfg_addr,
     PCIBus *s = e->pci.bus;
     PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr);
     uint32_t addr;
-    uint32_t limit;
 
     if (!pci_dev) {
         return;
     }
     addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr);
-    limit = pci_config_size(pci_dev);
-    if (limit <= addr) {
-        /* conventional pci device can be behind pcie-to-pci bridge.
-           256 <= addr < 4K has no effects. */
-        return;
-    }
-    pci_host_config_write_common(pci_dev, addr, limit, val, len);
+    pci_host_config_write_common(pci_dev, addr, val, len);
 }
 
 static uint64_t pcie_mmcfg_data_read(void *opaque,
@@ -83,19 +76,12 @@ static uint64_t pcie_mmcfg_data_read(void *opaque,
     PCIBus *s = e->pci.bus;
     PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr);
     uint32_t addr;
-    uint32_t limit;
 
     if (!pci_dev) {
         return ~0x0;
     }
     addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr);
-    limit = pci_config_size(pci_dev);
-    if (limit <= addr) {
-        /* conventional pci device can be behind pcie-to-pci bridge.
-           256 <= addr < 4K has no effects. */
-        return ~0x0;
-    }
-    return pci_host_config_read_common(pci_dev, addr, limit, len);
+    return pci_host_config_read_common(pci_dev, addr, len);
 }
 
 static const MemoryRegionOps pcie_mmcfg_ops = {
diff --git a/hw/spapr_pci.c b/hw/spapr_pci.c
index cfdd9dd..1e8d03e 100644
--- a/hw/spapr_pci.c
+++ b/hw/spapr_pci.c
@@ -67,25 +67,6 @@ static uint32_t rtas_pci_cfgaddr(uint32_t arg)
     return ((arg >> 20) & 0xf00) | (arg & 0xff);
 }
 
-static uint32_t rtas_read_pci_config_do(PCIDevice *pci_dev, uint32_t addr,
-                                        uint32_t limit, uint32_t len)
-{
-    if ((addr + len) <= limit) {
-        return pci_host_config_read_common(pci_dev, addr, limit, len);
-    } else {
-        return ~0x0;
-    }
-}
-
-static void rtas_write_pci_config_do(PCIDevice *pci_dev, uint32_t addr,
-                                     uint32_t limit, uint32_t val,
-                                     uint32_t len)
-{
-    if ((addr + len) <= limit) {
-        pci_host_config_write_common(pci_dev, addr, limit, val, len);
-    }
-}
-
 static void rtas_ibm_read_pci_config(sPAPREnvironment *spapr,
                                      uint32_t token, uint32_t nargs,
                                      target_ulong args,
@@ -101,7 +82,7 @@ static void rtas_ibm_read_pci_config(sPAPREnvironment *spapr,
     }
     size = rtas_ld(args, 3);
     addr = rtas_pci_cfgaddr(rtas_ld(args, 0));
-    val = rtas_read_pci_config_do(dev, addr, pci_config_size(dev), size);
+    val = pci_host_config_read_common(dev, addr, size);
     rtas_st(rets, 0, 0);
     rtas_st(rets, 1, val);
 }
@@ -120,7 +101,7 @@ static void rtas_read_pci_config(sPAPREnvironment *spapr,
     }
     size = rtas_ld(args, 1);
     addr = rtas_pci_cfgaddr(rtas_ld(args, 0));
-    val = rtas_read_pci_config_do(dev, addr, pci_config_size(dev), size);
+    val = pci_host_config_read_common(dev, addr, size);
     rtas_st(rets, 0, 0);
     rtas_st(rets, 1, val);
 }
@@ -141,7 +122,7 @@ static void rtas_ibm_write_pci_config(sPAPREnvironment *spapr,
     val = rtas_ld(args, 4);
     size = rtas_ld(args, 3);
     addr = rtas_pci_cfgaddr(rtas_ld(args, 0));
-    rtas_write_pci_config_do(dev, addr, pci_config_size(dev), val, size);
+    pci_host_config_write_common(dev, addr, val, size);
     rtas_st(rets, 0, 0);
 }
 
@@ -160,7 +141,7 @@ static void rtas_write_pci_config(sPAPREnvironment *spapr,
     val = rtas_ld(args, 2);
     size = rtas_ld(args, 1);
     addr = rtas_pci_cfgaddr(rtas_ld(args, 0));
-    rtas_write_pci_config_do(dev, addr, pci_config_size(dev), val, size);
+    pci_host_config_write_common(dev, addr, val, size);
     rtas_st(rets, 0, 0);
 }