SysBusDevice::mmio[] is kind of internal. Use the proper
sysbus_mmio_get_region() accessor.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/i386/microvm-dt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/i386/microvm-dt.c b/hw/i386/microvm-dt.c
index cb27dfd732e..d7f49bc1b5f 100644
--- a/hw/i386/microvm-dt.c
+++ b/hw/i386/microvm-dt.c
@@ -71,7 +71,8 @@ static void dt_add_virtio(MicrovmMachineState *mms, VirtIOMMIOProxy *mmio)
         return;
     }
 
-    hwaddr base = dev->mmio[0].addr;
+    MemoryRegion *mr = sysbus_mmio_get_region(dev, 0);
+    hwaddr base = mr->addr;
     hwaddr size = 512;
     unsigned index = (base - VIRTIO_MMIO_BASE) / size;
     uint32_t irq = mms->virtio_irq_base + index;
@@ -150,7 +151,8 @@ static void dt_add_pcie(MicrovmMachineState *mms)
 
 static void dt_add_ioapic(MicrovmMachineState *mms, SysBusDevice *dev)
 {
-    hwaddr base = dev->mmio[0].addr;
+    MemoryRegion *mr = sysbus_mmio_get_region(dev, 0);
+    hwaddr base = mr->addr;
     char *nodename;
     uint32_t ph;
     int index;
-- 
2.51.0