diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index eb156cb1165e0a033262b97217936468569ba074..a60436b5bc3e63725c5513f71685ea5f8db49ad0 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -950,8 +950,7 @@ build_ssdt(GArray *table_data, GArray *linker,
     /* Reserve space for header */
     acpi_data_push(ssdt->buf, sizeof(AcpiTableHeader));
 
-    /* Extra PCI root buses are implemented  only for i440fx */
-    bus = find_i440fx();
+    bus = PC_MACHINE(machine)->bus;
     if (bus) {
         QLIST_FOREACH(bus, &bus->child, sibling) {
             uint8_t bus_num = pci_bus_num(bus);
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 00b59cdae09ddcc961e7acf013e0e4a94d481093..48aa37a13842a80ed3db438438d016d4c2a5b6e9 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1167,7 +1167,7 @@ void pc_guest_info_machine_done(Notifier *notifier, void *data)
     PcGuestInfoState *guest_info_state = container_of(notifier,
                                                       PcGuestInfoState,
                                                       machine_done);
-    PCIBus *bus = find_i440fx();
+    PCIBus *bus = PC_MACHINE(qdev_get_machine())->bus;
 
     if (bus) {
         int extra_hosts = 0;
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 7d847b247dd9d76adcc2bd0ad45a116a045487ad..9654628f09a38da833ca22c79862fa09ab8949c9 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -185,6 +185,7 @@ static void pc_init1(MachineState *machine,
                               pcms->below_4g_mem_size,
                               pcms->above_4g_mem_size,
                               pci_memory, ram_memory);
+        pcms->bus = pci_bus;
     } else {
         pci_bus = NULL;
         i440fx_state = NULL;
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 6aaa0eedb0af644bcad4c6c88169d2e3bd503efd..b87e7ec19c25d4364f8bc0851b1d23d5e0d6ec88 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -181,6 +181,7 @@ static void pc_q35_init(MachineState *machine)
     qdev_init_nofail(DEVICE(q35_host));
     phb = PCI_HOST_BRIDGE(q35_host);
     host_bus = phb->bus;
+    pcms->bus = phb->bus;
     /* create ISA bus */
     lpc = pci_create_simple_multifunction(host_bus, PCI_DEVFN(ICH9_LPC_DEV,
                                           ICH9_LPC_FUNC), true,
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index beb44ca23c6efa930c6f780f54357e84ba015ff8..bbebf1536a8d488c88efa9262c7bff95a33e53f5 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -51,6 +51,7 @@ struct PCMachineState {
     OnOffAuto vmport;
     OnOffAuto smm;
     ram_addr_t below_4g_mem_size, above_4g_mem_size;
+    PCIBus *bus;
 };
 
 #define PC_MACHINE_ACPI_DEVICE_PROP "acpi-device"