diff --git a/tools/pciaccess.hpp b/tools/pciaccess.hpp
index ea7d5b4..3b25594 100644
--- a/tools/pciaccess.hpp
+++ b/tools/pciaccess.hpp
@@ -21,6 +21,8 @@
 #include <pciaccess.h>
 } // extern "C"
 
+#include <cstdint>
+
 namespace host_tool
 {
 
@@ -38,6 +40,12 @@
     virtual struct pci_device*
         pci_device_next(struct pci_device_iterator* iter) const = 0;
     virtual int pci_device_probe(struct pci_device* dev) const = 0;
+    virtual int pci_device_cfg_read_u8(struct pci_device* dev,
+                                       std::uint8_t* data,
+                                       pciaddr_t offset) const = 0;
+    virtual int pci_device_cfg_write_u8(struct pci_device* dev,
+                                        std::uint8_t data,
+                                        pciaddr_t offset) const = 0;
     virtual int pci_device_map_range(struct pci_device* dev, pciaddr_t base,
                                      pciaddr_t size, unsigned map_flags,
                                      void** addr) const = 0;
@@ -61,6 +69,10 @@
     struct pci_device*
         pci_device_next(struct pci_device_iterator* iter) const override;
     int pci_device_probe(struct pci_device* dev) const override;
+    int pci_device_cfg_read_u8(struct pci_device* dev, std::uint8_t* data,
+                               pciaddr_t offset) const override;
+    int pci_device_cfg_write_u8(struct pci_device* dev, std::uint8_t data,
+                                pciaddr_t offset) const override;
     int pci_device_map_range(struct pci_device* dev, pciaddr_t base,
                              pciaddr_t size, unsigned map_flags,
                              void** addr) const override;