qemu: Add more defaults for RISC-V virt guests

We would have used virtio for networking anyway, but it's
better to be explicit; for graphics, none of the existing
models work right now but virtio is the only one which
has a non-PCI variant, so it's as good a default as any
Spotted-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_domain.c

@@ -5847,6 +5847,10 @@ qemuDomainDefaultNetModel(const virDomainDef *def,
         return "lan9118";
     }
 
+    /* virtio is a sensible default for RISC-V virt guests */
+    if (qemuDomainIsRISCVVirt(def))
+        return "virtio";
+
     /* In all other cases the model depends on the capabilities. If they were
      * not provided don't report any default. */
     if (!qemuCaps)
@@ -6337,7 +6341,9 @@ qemuDomainDeviceVideoDefPostParse(virDomainVideoDefPtr video,
     if (video->type == VIR_DOMAIN_VIDEO_TYPE_DEFAULT) {
         if (ARCH_IS_PPC64(def->os.arch))
             video->type = VIR_DOMAIN_VIDEO_TYPE_VGA;
-        else if (qemuDomainIsARMVirt(def) || ARCH_IS_S390(def->os.arch))
+        else if (qemuDomainIsARMVirt(def) ||
+                 qemuDomainIsRISCVVirt(def) ||
+                 ARCH_IS_S390(def->os.arch))
             video->type = VIR_DOMAIN_VIDEO_TYPE_VIRTIO;
         else
             video->type = VIR_DOMAIN_VIDEO_TYPE_CIRRUS;