qemu: use nec-usb-xhci as a default controller for aarch64 if available

This is a USB3 controller and it's a better choice than piix3-uhci.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>
Acked-by: NAndrea Bolognani <abologna@redhat.com>

src/qemu/qemu_domain.c

@@ -3279,6 +3279,9 @@ qemuDomainControllerDefPostParse(virDomainControllerDefPtr cont,
                     /* Explicitly fallback to legacy USB controller for PPC64. */
                     cont->model = -1;
                 }
+            } else if (def->os.arch == VIR_ARCH_AARCH64) {
+                if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NEC_USB_XHCI))
+                    cont->model = VIR_DOMAIN_CONTROLLER_MODEL_USB_NEC_XHCI;
             }
         }
         /* forbid usb model 'qusb1' and 'qusb2' in this kind of hyperviosr */

tests/qemuxml2argvdata/qemuxml2argv-aarch64-usb-controller-nec-xhci.args

+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-aarch64 \
+-name QEMUGuest1 \
+-S \
+-M virt \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-QEMUGuest1/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-device nec-usb-xhci,id=usb,bus=pcie.0,addr=0x1

tests/qemuxml2argvdata/qemuxml2argv-aarch64-usb-controller-nec-xhci.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219100</memory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='aarch64' machine='virt'>hvm</type>
+  </os>
+  <devices>
+    <emulator>/usr/bin/qemu-system-aarch64</emulator>
+    <controller type='usb' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
+    </controller>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -2469,6 +2469,10 @@ mymain(void)
     DO_TEST("ppc64-usb-controller-legacy",
             QEMU_CAPS_PIIX3_USB_UHCI);
 
+    DO_TEST("aarch64-usb-controller-nec-xhci",
+            QEMU_CAPS_OBJECT_GPEX,
+            QEMU_CAPS_NEC_USB_XHCI);
+
     DO_TEST_PARSE_FLAGS_ERROR("missing-machine",
                               VIR_DOMAIN_DEF_PARSE_SKIP_OSTYPE_CHECKS,
                               NONE);