qemu: no USB by default on RISC-V machines

Signed-off-by: NLubomir Rintel <lkundrak@v3.sk>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>

src/qemu/qemu_domain.c

@@ -3280,6 +3280,11 @@ qemuDomainDefAddDefaultDevices(virDomainDefPtr def,
         addPCIRoot = true;
         break;
 
+    case VIR_ARCH_RISCV32:
+    case VIR_ARCH_RISCV64:
+        addDefaultUSB = false;
+        break;
+
     case VIR_ARCH_S390:
     case VIR_ARCH_S390X:
         addDefaultUSB = false;
@@ -3306,8 +3311,6 @@ qemuDomainDefAddDefaultDevices(virDomainDefPtr def,
     case VIR_ARCH_OR32:
     case VIR_ARCH_PARISC:
     case VIR_ARCH_PARISC64:
-    case VIR_ARCH_RISCV32:
-    case VIR_ARCH_RISCV64:
     case VIR_ARCH_PPCLE:
     case VIR_ARCH_UNICORE32:
     case VIR_ARCH_XTENSA:

tests/qemuxml2xmloutdata/riscv64-virt.xml

@@ -22,7 +22,6 @@
       <target dev='vda' bus='virtio'/>
       <address type='virtio-mmio'/>
     </disk>
-    <controller type='usb' index='0'/>
     <serial type='pty'>
       <target port='0'/>
     </serial>