diff --git a/src/qemu/qemu_domain_address.c b/src/qemu/qemu_domain_address.c
index be4ed2312c..d2f7953f53 100644
--- a/src/qemu/qemu_domain_address.c
+++ b/src/qemu/qemu_domain_address.c
@@ -398,6 +398,44 @@ qemuDomainAssignS390Addresses(virDomainDefPtr def,
 }
 
 
+static int
+qemuDomainHasVirtioMMIODevicesCallback(virDomainDefPtr def ATTRIBUTE_UNUSED,
+                                       virDomainDeviceDefPtr dev ATTRIBUTE_UNUSED,
+                                       virDomainDeviceInfoPtr info,
+                                       void *opaque)
+{
+    if (info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_VIRTIO_MMIO) {
+        /* We can stop iterating as soon as we find the first
+         * virtio-mmio device */
+        *((bool *) opaque) = true;
+        return -1;
+    }
+
+    return 0;
+}
+
+
+/**
+ * qemuDomainHasVirtioMMIODevices:
+ * @def: domain definition
+ *
+ * Scan @def looking for devices with a virtio-mmio address.
+ *
+ * Returns: true if there are any, false otherwise
+ */
+static bool
+qemuDomainHasVirtioMMIODevices(virDomainDefPtr def)
+{
+    bool result = false;
+
+    virDomainDeviceInfoIterate(def,
+                               qemuDomainHasVirtioMMIODevicesCallback,
+                               &result);
+
+    return result;
+}
+
+
 static void
 qemuDomainAssignARMVirtioMMIOAddresses(virDomainDefPtr def,
                                        virQEMUCapsPtr qemuCaps)
@@ -410,9 +448,16 @@ qemuDomainAssignARMVirtioMMIOAddresses(virDomainDefPtr def,
           qemuDomainMachineIsVirt(def)))
         return;
 
-    if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_MMIO)) {
-        qemuDomainPrimeVirtioDeviceAddresses(
-            def, VIR_DOMAIN_DEVICE_ADDRESS_TYPE_VIRTIO_MMIO);
+    /* We use virtio-mmio by default on mach-virt guests only if they already
+     * have at least one virtio-mmio device: in all other cases, we prefer
+     * virtio-pci */
+    if (qemuDomainMachineHasPCIeRoot(def) &&
+        !qemuDomainHasVirtioMMIODevices(def)) {
+        qemuDomainPrimeVirtioDeviceAddresses(def,
+                                             VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI);
+    } else if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_MMIO)) {
+        qemuDomainPrimeVirtioDeviceAddresses(def,
+                                             VIR_DOMAIN_DEVICE_ADDRESS_TYPE_VIRTIO_MMIO);
     }
 }
 
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virt-2.6-virtio-pci-default.args b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virt-2.6-virtio-pci-default.args
index 75db1a4075..df03c6e025 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virt-2.6-virtio-pci-default.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virt-2.6-virtio-pci-default.args
@@ -21,14 +21,18 @@ QEMU_AUDIO_DRV=none \
 -initrd /aarch64.initrd \
 -append 'earlyprintk console=ttyAMA0,115200n8 rw root=/dev/vda rootwait' \
 -dtb /aarch64.dtb \
--device virtio-serial-device,id=virtio-serial0 \
+-device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1 \
+-device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x0 \
+-device ioh3420,port=0x10,chassis=3,id=pci.3,bus=pcie.0,addr=0x2 \
+-device virtio-serial-pci,id=virtio-serial0,bus=pci.2,addr=0x2 \
 -drive file=/aarch64.raw,format=raw,if=none,id=drive-virtio-disk0 \
--device virtio-blk-device,drive=drive-virtio-disk0,id=virtio-disk0 \
--device virtio-net-device,vlan=0,id=net0,mac=52:54:00:09:a4:37 \
+-device virtio-blk-pci,bus=pci.2,addr=0x3,drive=drive-virtio-disk0,\
+id=virtio-disk0 \
+-device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:09:a4:37,bus=pci.2,addr=0x1 \
 -net user,vlan=0,name=hostnet0 \
 -serial pty \
 -chardev pty,id=charconsole1 \
 -device virtconsole,chardev=charconsole1,id=console1 \
--device virtio-balloon-device,id=balloon0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.2,addr=0x4 \
 -object rng-random,id=objrng0,filename=/dev/random \
--device virtio-rng-device,rng=objrng0,id=rng0
+-device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.2,addr=0x5
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virtio-pci-default.args b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virtio-pci-default.args
index b5b010ca41..080b02519f 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virtio-pci-default.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virtio-pci-default.args
@@ -21,14 +21,21 @@ QEMU_AUDIO_DRV=none \
 -initrd /aarch64.initrd \
 -append 'earlyprintk console=ttyAMA0,115200n8 rw root=/dev/vda rootwait' \
 -dtb /aarch64.dtb \
--device virtio-serial-device,id=virtio-serial0 \
+-device ioh3420,port=0x8,chassis=1,id=pci.1,bus=pcie.0,addr=0x1 \
+-device ioh3420,port=0x10,chassis=2,id=pci.2,bus=pcie.0,addr=0x2 \
+-device ioh3420,port=0x18,chassis=3,id=pci.3,bus=pcie.0,addr=0x3 \
+-device ioh3420,port=0x20,chassis=4,id=pci.4,bus=pcie.0,addr=0x4 \
+-device ioh3420,port=0x28,chassis=5,id=pci.5,bus=pcie.0,addr=0x5 \
+-device ioh3420,port=0x30,chassis=6,id=pci.6,bus=pcie.0,addr=0x6 \
+-device virtio-serial-pci,id=virtio-serial0,bus=pci.2,addr=0x0 \
 -drive file=/aarch64.raw,format=raw,if=none,id=drive-virtio-disk0 \
--device virtio-blk-device,drive=drive-virtio-disk0,id=virtio-disk0 \
--device virtio-net-device,vlan=0,id=net0,mac=52:54:00:09:a4:37 \
+-device virtio-blk-pci,bus=pci.3,addr=0x0,drive=drive-virtio-disk0,\
+id=virtio-disk0 \
+-device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:09:a4:37,bus=pci.1,addr=0x0 \
 -net user,vlan=0,name=hostnet0 \
 -serial pty \
 -chardev pty,id=charconsole1 \
 -device virtconsole,chardev=charconsole1,id=console1 \
--device virtio-balloon-device,id=balloon0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.4,addr=0x0 \
 -object rng-random,id=objrng0,filename=/dev/random \
--device virtio-rng-device,rng=objrng0,id=rng0
+-device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.5,addr=0x0
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virtio-pci-default.xml b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virtio-pci-default.xml
index ad34615128..2a84a96698 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virtio-pci-default.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-aarch64-virtio-pci-default.xml
@@ -38,9 +38,6 @@
       <target type='virtio' port='0'/>
     </console>
     <memballoon model='virtio'/>
-    <!--
-      This actually doesn't work in practice because vexpress only has
-      4 virtio slots available, rng makes 5 -->
     <rng model='virtio'>
       <backend model='random'>/dev/random</backend>
     </rng>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index c3c3c0e00d..82af287a5a 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -2149,6 +2149,7 @@ mymain(void)
        specified. */
     DO_TEST("aarch64-virtio-pci-default",
             QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_DTB,
+            QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY,
             QEMU_CAPS_DEVICE_VIRTIO_MMIO,
             QEMU_CAPS_DEVICE_VIRTIO_RNG, QEMU_CAPS_OBJECT_RNG_RANDOM,
             QEMU_CAPS_OBJECT_GPEX, QEMU_CAPS_DEVICE_PCI_BRIDGE,
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-aarch64-virtio-pci-default.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-aarch64-virtio-pci-default.xml
index 7c3fc19817..a568f11f16 100644
--- a/tests/qemuxml2xmloutdata/qemuxml2xmlout-aarch64-virtio-pci-default.xml
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-aarch64-virtio-pci-default.xml
@@ -30,16 +30,46 @@
     <disk type='file' device='disk'>
       <source file='/aarch64.raw'/>
       <target dev='vda' bus='virtio'/>
-      <address type='virtio-mmio'/>
+      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
     </disk>
     <controller type='pci' index='0' model='pcie-root'/>
     <controller type='virtio-serial' index='0'>
-      <address type='virtio-mmio'/>
+      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
+    </controller>
+    <controller type='pci' index='1' model='pcie-root-port'>
+      <model name='ioh3420'/>
+      <target chassis='1' port='0x8'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
+    </controller>
+    <controller type='pci' index='2' model='pcie-root-port'>
+      <model name='ioh3420'/>
+      <target chassis='2' port='0x10'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+    </controller>
+    <controller type='pci' index='3' model='pcie-root-port'>
+      <model name='ioh3420'/>
+      <target chassis='3' port='0x18'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </controller>
+    <controller type='pci' index='4' model='pcie-root-port'>
+      <model name='ioh3420'/>
+      <target chassis='4' port='0x20'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
+    </controller>
+    <controller type='pci' index='5' model='pcie-root-port'>
+      <model name='ioh3420'/>
+      <target chassis='5' port='0x28'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
+    </controller>
+    <controller type='pci' index='6' model='pcie-root-port'>
+      <model name='ioh3420'/>
+      <target chassis='6' port='0x30'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
     </controller>
     <interface type='user'>
       <mac address='52:54:00:09:a4:37'/>
       <model type='virtio'/>
-      <address type='virtio-mmio'/>
+      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
     </interface>
     <serial type='pty'>
       <target port='0'/>
@@ -51,11 +81,11 @@
       <target type='virtio' port='1'/>
     </console>
     <memballoon model='virtio'>
-      <address type='virtio-mmio'/>
+      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
     </memballoon>
     <rng model='virtio'>
       <backend model='random'>/dev/random</backend>
-      <address type='virtio-mmio'/>
+      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
     </rng>
   </devices>
 </domain>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index ddd17cb1ee..bbd4687336 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -961,6 +961,7 @@ mymain(void)
             QEMU_CAPS_DEVICE_VIRTIO_RNG, QEMU_CAPS_OBJECT_RNG_RANDOM);
     DO_TEST("aarch64-virtio-pci-default",
             QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_DTB,
+            QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY,
             QEMU_CAPS_DEVICE_VIRTIO_MMIO,
             QEMU_CAPS_DEVICE_VIRTIO_RNG, QEMU_CAPS_OBJECT_RNG_RANDOM,
             QEMU_CAPS_OBJECT_GPEX, QEMU_CAPS_DEVICE_PCI_BRIDGE,