Since these architectures were introduced when qemu-xhci was
already a thing, we never considered allowing the older
nec-xhci model as a fallback.

That said, every other architecture that defaults to USB3
allows this, so we might as well be consistent. The chances
of nec-xhci being available when qemu-xhci isn't are of
course close to zero.

Signed-off-by: Andrea Bolognani <abolo...@redhat.com>
---
 src/qemu/qemu_domain.c                        |  4 +-
 ...-fallback-virt-riscv64.riscv64-latest.args | 34 +++++++++++++++++
 ...t-fallback-virt-riscv64.riscv64-latest.xml | 37 +++++++++++++++++++
 ...ntroller-default-fallback-virt-riscv64.xml |  1 +
 tests/qemuxmlconftest.c                       |  7 +++-
 5 files changed, 81 insertions(+), 2 deletions(-)
 create mode 100644 
tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.riscv64-latest.args
 create mode 100644 
tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.riscv64-latest.xml
 create mode 120000 
tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.xml

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index d5ddc4ef43..529acefbd7 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -4323,9 +4323,11 @@ qemuDomainDefaultUSBControllerModel(const virDomainDef 
*def,
 
     if (ARCH_IS_LOONGARCH(def->os.arch) ||
         qemuDomainIsRISCVVirt(def)) {
-        /* Use qemu-xhci (USB3) for modern architectures */
+        /* Use USB3 for modern architectures */
         if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_QEMU_XHCI))
             return VIR_DOMAIN_CONTROLLER_MODEL_USB_QEMU_XHCI;
+        if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NEC_USB_XHCI))
+            return VIR_DOMAIN_CONTROLLER_MODEL_USB_NEC_XHCI;
 
         /* No fallback if that's not available */
         return VIR_DOMAIN_CONTROLLER_MODEL_USB_DEFAULT;
diff --git 
a/tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.riscv64-latest.args
 
b/tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.riscv64-latest.args
new file mode 100644
index 0000000000..7292cb52db
--- /dev/null
+++ 
b/tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.riscv64-latest.args
@@ -0,0 +1,34 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/var/lib/libvirt/qemu/domain--1-test \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/var/lib/libvirt/qemu/domain--1-test/.local/share \
+XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain--1-test/.cache \
+XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-test/.config \
+/usr/bin/qemu-system-riscv64 \
+-name guest=test,debug-threads=on \
+-S \
+-object 
'{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-test/master-key.aes"}'
 \
+-machine 
virt,usb=off,dump-guest-core=off,memory-backend=riscv_virt_board.ram,acpi=off \
+-accel tcg \
+-cpu rv64 \
+-m size=2097152k \
+-object 
'{"qom-type":"memory-backend-ram","id":"riscv_virt_board.ram","size":2147483648}'
 \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid 11dbdcdd-4c3b-482b-8903-9bdb8c0a2774 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-device 
'{"driver":"pcie-root-port","port":8,"chassis":1,"id":"pci.1","bus":"pcie.0","multifunction":true,"addr":"0x1"}'
 \
+-device 
'{"driver":"pcie-root-port","port":9,"chassis":2,"id":"pci.2","bus":"pcie.0","addr":"0x1.0x1"}'
 \
+-device '{"driver":"nec-usb-xhci","id":"usb","bus":"pci.1","addr":"0x0"}' \
+-audiodev '{"id":"audio1","driver":"none"}' \
+-sandbox 
on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-msg timestamp=on
diff --git 
a/tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.riscv64-latest.xml
 
b/tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.riscv64-latest.xml
new file mode 100644
index 0000000000..6f0461d0fc
--- /dev/null
+++ 
b/tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.riscv64-latest.xml
@@ -0,0 +1,37 @@
+<domain type='qemu'>
+  <name>test</name>
+  <uuid>11dbdcdd-4c3b-482b-8903-9bdb8c0a2774</uuid>
+  <memory unit='KiB'>2097152</memory>
+  <currentMemory unit='KiB'>2097152</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='riscv64' machine='virt'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='custom' match='exact' check='none'>
+    <model fallback='forbid'>rv64</model>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-riscv64</emulator>
+    <controller type='usb' index='0' model='nec-xhci'>
+      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' 
function='0x0'/>
+    </controller>
+    <controller type='pci' index='0' model='pcie-root'/>
+    <controller type='pci' index='1' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='1' port='0x8'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x0' multifunction='on'/>
+    </controller>
+    <controller type='pci' index='2' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='2' port='0x9'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x1'/>
+    </controller>
+    <audio id='1' type='none'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>
diff --git 
a/tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.xml 
b/tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.xml
new file mode 120000
index 0000000000..061240f8f2
--- /dev/null
+++ b/tests/qemuxmlconfdata/usb-controller-default-fallback-virt-riscv64.xml
@@ -0,0 +1 @@
+usb-controller-default-virt-riscv64.xml
\ No newline at end of file
diff --git a/tests/qemuxmlconftest.c b/tests/qemuxmlconftest.c
index a955861dc4..439aa42e6b 100644
--- a/tests/qemuxmlconftest.c
+++ b/tests/qemuxmlconftest.c
@@ -2029,11 +2029,16 @@ mymain(void)
                  ARG_END);
 
     DO_TEST_CAPS_ARCH_LATEST("usb-controller-default-virt-riscv64", "riscv64");
+    DO_TEST_FULL("usb-controller-default-fallback-virt-riscv64", 
".riscv64-latest",
+                 ARG_CAPS_ARCH, "riscv64",
+                 ARG_CAPS_VER, "latest",
+                 ARG_QEMU_CAPS_DEL, QEMU_CAPS_DEVICE_QEMU_XHCI, QEMU_CAPS_LAST,
+                 ARG_END);
     DO_TEST_FULL("usb-controller-default-unavailable-virt-riscv64", 
".riscv64-latest",
                  ARG_CAPS_ARCH, "riscv64",
                  ARG_CAPS_VER, "latest",
                  ARG_FLAGS, FLAG_EXPECT_PARSE_ERROR,
-                 ARG_QEMU_CAPS_DEL, QEMU_CAPS_DEVICE_QEMU_XHCI, QEMU_CAPS_LAST,
+                 ARG_QEMU_CAPS_DEL, QEMU_CAPS_DEVICE_QEMU_XHCI, 
QEMU_CAPS_NEC_USB_XHCI, QEMU_CAPS_LAST,
                  ARG_END);
 
     /* controller selection tests for various uncommon machine types */
-- 
2.50.1

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