diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index ec0e5efcb28..8f8ac894b10 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -17,6 +17,8 @@
 
 #define HPET_INTCAP "hpet-intcap"
 
+#define MAX_IDE_BUS 2
+
 /**
  * PCMachineState:
  * @acpi_dev: link to ACPI PM device that performs ACPI hotplug handling
@@ -37,6 +39,7 @@ typedef struct PCMachineState {
     PFlashCFI01 *flash[2];
     ISADevice *pcspk;
     DeviceState *iommu;
+    BusState *idebus[MAX_IDE_BUS];
 
     /* Configuration options: */
     uint64_t max_ram_below_4g;
@@ -182,7 +185,6 @@ void pc_basic_device_init(struct PCMachineState *pcms,
                           bool create_fdctrl,
                           uint32_t hpet_irqs);
 void pc_cmos_init(PCMachineState *pcms,
-                  BusState *ide0, BusState *ide1,
                   ISADevice *s);
 void pc_nic_init(PCMachineClass *pcmc, ISABus *isa_bus, PCIBus *pci_bus);
 
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 196827531a5..8b0f54e284c 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -574,7 +574,6 @@ static void pc_cmos_init_late(void *opaque)
 }
 
 void pc_cmos_init(PCMachineState *pcms,
-                  BusState *idebus0, BusState *idebus1,
                   ISADevice *rtc)
 {
     int val;
@@ -634,8 +633,8 @@ void pc_cmos_init(PCMachineState *pcms,
 
     /* hard drives and FDC */
     arg.rtc_state = s;
-    arg.idebus[0] = idebus0;
-    arg.idebus[1] = idebus1;
+    arg.idebus[0] = pcms->idebus[0];
+    arg.idebus[1] = pcms->idebus[1];
     qemu_register_reset(pc_cmos_init_late, &arg);
 }
 
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 999b7b806ca..8df88a6ccd1 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -68,7 +68,6 @@
 #include "kvm/kvm-cpu.h"
 #include "target/i386/cpu.h"
 
-#define MAX_IDE_BUS 2
 #define XEN_IOAPIC_NUM_PIRQS 128ULL
 
 #ifdef CONFIG_IDE_ISA
@@ -114,7 +113,6 @@ static void pc_init1(MachineState *machine,
     Object *piix4_pm = NULL;
     qemu_irq smi_irq;
     GSIState *gsi_state;
-    BusState *idebus[MAX_IDE_BUS];
     ISADevice *rtc_state;
     MemoryRegion *ram_memory;
     MemoryRegion *pci_memory = NULL;
@@ -299,8 +297,8 @@ static void pc_init1(MachineState *machine,
         piix4_pm = object_resolve_path_component(OBJECT(pci_dev), "pm");
         dev = DEVICE(object_resolve_path_component(OBJECT(pci_dev), "ide"));
         pci_ide_create_devs(PCI_DEVICE(dev));
-        idebus[0] = qdev_get_child_bus(dev, "ide.0");
-        idebus[1] = qdev_get_child_bus(dev, "ide.1");
+        pcms->idebus[0] = qdev_get_child_bus(dev, "ide.0");
+        pcms->idebus[1] = qdev_get_child_bus(dev, "ide.1");
     } else {
         isa_bus = isa_bus_new(NULL, system_memory, system_io,
                               &error_abort);
@@ -312,8 +310,8 @@ static void pc_init1(MachineState *machine,
 
         i8257_dma_init(OBJECT(machine), isa_bus, 0);
         pcms->hpet_enabled = false;
-        idebus[0] = NULL;
-        idebus[1] = NULL;
+        pcms->idebus[0] = NULL;
+        pcms->idebus[1] = NULL;
     }
 
     if (x86ms->pic == ON_OFF_AUTO_ON || x86ms->pic == ON_OFF_AUTO_AUTO) {
@@ -342,7 +340,7 @@ static void pc_init1(MachineState *machine,
     pc_nic_init(pcmc, isa_bus, pci_bus);
 
     if (pcmc->pci_enabled) {
-        pc_cmos_init(pcms, idebus[0], idebus[1], rtc_state);
+        pc_cmos_init(pcms, rtc_state);
     }
 #ifdef CONFIG_IDE_ISA
     else {
@@ -361,9 +359,9 @@ static void pc_init1(MachineState *machine,
              * second one.
              */
             busname[4] = '0' + i;
-            idebus[i] = qdev_get_child_bus(DEVICE(dev), busname);
+            pcms->idebus[i] = qdev_get_child_bus(DEVICE(dev), busname);
         }
-        pc_cmos_init(pcms, idebus[0], idebus[1], rtc_state);
+        pc_cmos_init(pcms, rtc_state);
     }
 #endif
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index d346fa3b1d6..71402c36eb2 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -126,7 +126,6 @@ static void pc_q35_init(MachineState *machine)
     PCIBus *host_bus;
     PCIDevice *lpc;
     DeviceState *lpc_dev;
-    BusState *idebus[MAX_SATA_PORTS];
     ISADevice *rtc_state;
     MemoryRegion *system_memory = get_system_memory();
     MemoryRegion *system_io = get_system_io();
@@ -300,13 +299,13 @@ static void pc_q35_init(MachineState *machine)
                                                          ICH9_SATA1_FUNC),
                                                "ich9-ahci");
         ich9 = ICH9_AHCI(pdev);
-        idebus[0] = qdev_get_child_bus(DEVICE(pdev), "ide.0");
-        idebus[1] = qdev_get_child_bus(DEVICE(pdev), "ide.1");
+        pcms->idebus[0] = qdev_get_child_bus(DEVICE(pdev), "ide.0");
+        pcms->idebus[1] = qdev_get_child_bus(DEVICE(pdev), "ide.1");
         g_assert(MAX_SATA_PORTS == ich9->ahci.ports);
         ide_drive_get(hd, ich9->ahci.ports);
         ahci_ide_create_devs(&ich9->ahci, hd);
     } else {
-        idebus[0] = idebus[1] = NULL;
+        pcms->idebus[0] = pcms->idebus[1] = NULL;
     }
 
     if (machine_usb(machine)) {
@@ -327,7 +326,7 @@ static void pc_q35_init(MachineState *machine)
         smbus_eeprom_init(pcms->smbus, 8, NULL, 0);
     }
 
-    pc_cmos_init(pcms, idebus[0], idebus[1], rtc_state);
+    pc_cmos_init(pcms, rtc_state);
 
     /* the rest devices to which pci devfn is automatically assigned */
     pc_vga_init(isa_bus, host_bus);
