qemu: support configuring usb3 controller port count

This adds a ports= attribute to usb controller XML, like

  <controller type='usb' model='nec-xhci' ports='8'/>

This maps to:

  qemu -device nec-usb-xhci,p2=8,p3=8

Meaning, 8 ports that support both usb2 and usb3 devices. Gerd
suggested to just expose them as one knob.

https://bugzilla.redhat.com/show_bug.cgi?id=1271408

docs/formatdomain.html.in

@@ -3028,8 +3028,10 @@
       <span class="since">since 0.10.0</span>, if the USB bus needs to be
       explicitly disabled for the guest, <code>model='none'</code> may be
       used.  <span class="since">Since 1.0.5</span>, no default USB controller
-      will be built on S390.  The PowerPC64 "spapr-vio" addresses do not have an
-      associated controller.
+      will be built on S390.  <span class="since">Since 1.3.5</span>, USB
+      controllers accept a <code>ports</code> attribute to configure how
+      many devices can be connected to the controller. The PowerPC64
+      "spapr-vio" addresses do not have an associated controller.
     </p>
 
     <p>

docs/schemas/domaincommon.rng

@@ -1743,7 +1743,8 @@
               </attribute>
             </optional>
           </group>
-          <!-- usb has an optional attribute "model", and optional subelement "master" -->
+          <!-- usb has an optional attribute "model",
+               and optional subelements "master" and "ports" -->
           <group>
             <attribute name="type">
               <value>usb</value>
@@ -1768,6 +1769,11 @@
             <optional>
               <ref name="usbmaster"/>
             </optional>
+            <optional>
+              <attribute name="ports">
+                <ref name="unsignedInt"/>
+              </attribute>
+            </optional>
           </group>
           <!-- pci has an optional attribute "model" -->
           <group>

src/conf/domain_conf.c

@@ -1655,6 +1655,9 @@ virDomainControllerDefNew(virDomainControllerType type)
         def->opts.vioserial.ports = -1;
         def->opts.vioserial.vectors = -1;
         break;
+    case VIR_DOMAIN_CONTROLLER_TYPE_USB:
+        def->opts.usbopts.ports = -1;
+        break;
     case VIR_DOMAIN_CONTROLLER_TYPE_PCI:
         def->opts.pciopts.chassisNr = -1;
         def->opts.pciopts.chassis = -1;
@@ -1667,7 +1670,6 @@ virDomainControllerDefNew(virDomainControllerType type)
     case VIR_DOMAIN_CONTROLLER_TYPE_SCSI:
     case VIR_DOMAIN_CONTROLLER_TYPE_SATA:
     case VIR_DOMAIN_CONTROLLER_TYPE_CCID:
-    case VIR_DOMAIN_CONTROLLER_TYPE_USB:
     case VIR_DOMAIN_CONTROLLER_TYPE_LAST:
         break;
     }
@@ -7837,6 +7839,8 @@ virDomainControllerDefParseXML(xmlNodePtr node,
     char *busNr = NULL;
     int numaNode = -1;
     char *ioeventfd = NULL;
+    char *portsStr = NULL;
+    int ports = -1;
     xmlNodePtr saved = ctxt->node;
     int rc;
 
@@ -7949,20 +7953,19 @@ virDomainControllerDefParseXML(xmlNodePtr node,
         goto error;
     }
 
-    switch (def->type) {
-    case VIR_DOMAIN_CONTROLLER_TYPE_VIRTIO_SERIAL: {
-        char *ports = virXMLPropString(node, "ports");
-        if (ports) {
-            int r = virStrToLong_i(ports, NULL, 10,
-                                   &def->opts.vioserial.ports);
-            if (r != 0 || def->opts.vioserial.ports < 0) {
+    portsStr = virXMLPropString(node, "ports");
+    if (portsStr) {
+        int r = virStrToLong_i(portsStr, NULL, 10, &ports);
+        if (r != 0 || ports < 0) {
             virReportError(VIR_ERR_INTERNAL_ERROR,
-                               _("Invalid ports: %s"), ports);
-                VIR_FREE(ports);
+                           _("Invalid ports: %s"), portsStr);
             goto error;
         }
     }
-        VIR_FREE(ports);
+
+    switch (def->type) {
+    case VIR_DOMAIN_CONTROLLER_TYPE_VIRTIO_SERIAL: {
+        def->opts.vioserial.ports = ports;
 
         char *vectors = virXMLPropString(node, "vectors");
         if (vectors) {
@@ -7998,6 +8001,8 @@ virDomainControllerDefParseXML(xmlNodePtr node,
             def->info.mastertype = VIR_DOMAIN_CONTROLLER_MASTER_USB;
             def->info.master.usb.startport = masterPort;
         }
+
+        def->opts.usbopts.ports = ports;
         break;
     }
     case VIR_DOMAIN_CONTROLLER_TYPE_PCI:
@@ -8125,6 +8130,7 @@ virDomainControllerDefParseXML(xmlNodePtr node,
     VIR_FREE(port);
     VIR_FREE(busNr);
     VIR_FREE(ioeventfd);
+    VIR_FREE(portsStr);
 
     return def;
 
@@ -17219,6 +17225,13 @@ virDomainControllerDefCheckABIStability(virDomainControllerDefPtr src,
                            dst->opts.vioserial.vectors, src->opts.vioserial.vectors);
             return false;
         }
+    } else if (src->type == VIR_DOMAIN_CONTROLLER_TYPE_USB) {
+        if (src->opts.usbopts.ports != dst->opts.usbopts.ports) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("Target controller ports %d does not match source %d"),
+                           dst->opts.usbopts.ports, src->opts.usbopts.ports);
+            return false;
+        }
     }
 
     if (!virDomainDeviceInfoCheckABIStability(&src->info, &dst->info))
@@ -19448,6 +19461,13 @@ virDomainControllerDefFormat(virBufferPtr buf,
         }
         break;
 
+    case VIR_DOMAIN_CONTROLLER_TYPE_USB:
+        if (def->opts.usbopts.ports != -1) {
+            virBufferAsprintf(buf, " ports='%d'",
+                              def->opts.usbopts.ports);
+        }
+        break;
+
     case VIR_DOMAIN_CONTROLLER_TYPE_PCI:
         if (def->opts.pciopts.pcihole64)
             pcihole64 = true;

src/conf/domain_conf.h

@@ -846,6 +846,12 @@ struct _virDomainPCIControllerOpts {
     int numaNode;
 };
 
+typedef struct _virDomainUSBControllerOpts virDomainUSBControllerOpts;
+typedef virDomainUSBControllerOpts *virDomainUSBControllerOptsPtr;
+struct _virDomainUSBControllerOpts {
+    int ports;   /* -1 == undef */
+};
+
 /* Stores the virtual disk controller configuration */
 struct _virDomainControllerDef {
     int type;
@@ -858,6 +864,7 @@ struct _virDomainControllerDef {
     union {
         virDomainVirtioSerialOpts vioserial;
         virDomainPCIControllerOpts pciopts;
+        virDomainUSBControllerOpts usbopts;
     } opts;
     virDomainDeviceInfo info;
 };

src/qemu/qemu_command.c

@@ -2152,6 +2152,19 @@ qemuBuildUSBControllerDevStr(const virDomainDef *domainDef,
 
     virBufferAsprintf(buf, "%s", smodel);
 
+    if (def->opts.usbopts.ports != -1) {
+        if (model != VIR_DOMAIN_CONTROLLER_MODEL_USB_NEC_XHCI ||
+            !virQEMUCapsGet(qemuCaps, QEMU_CAPS_NEC_USB_XHCI_PORTS)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("usb controller type %s doesn't support 'ports' "
+                             "with this QEMU binary"), smodel);
+            return -1;
+        }
+
+        virBufferAsprintf(buf, ",p2=%d,p3=%d",
+                          def->opts.usbopts.ports, def->opts.usbopts.ports);
+    }
+
     if (def->info.mastertype == VIR_DOMAIN_CONTROLLER_MASTER_USB)
         virBufferAsprintf(buf, ",masterbus=%s.0,firstport=%d",
                           def->info.alias, def->info.master.usb.startport);

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

@@ -0,0 +1,22 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu \
+-name QEMUGuest1 \
+-S \
+-M pc \
+-m 214 \
+-smp 1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefconfig \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline \
+-no-acpi \
+-boot c \
+-device nec-usb-xhci,p2=8,p3=8,id=usb,bus=pci.0,addr=0x3

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

@@ -0,0 +1,16 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <controller type='usb' index='0' model='nec-xhci' ports='8'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1172,6 +1172,9 @@ mymain(void)
                     QEMU_CAPS_DEVICE_PCI_BRIDGE,
                     QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE, QEMU_CAPS_PCI_OHCI,
                     QEMU_CAPS_PIIX3_USB_UHCI);
+    DO_TEST("usb-controller-xhci",
+            QEMU_CAPS_CHARDEV, QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_PIIX3_USB_UHCI,
+            QEMU_CAPS_NEC_USB_XHCI, QEMU_CAPS_NEC_USB_XHCI_PORTS);
 
     DO_TEST("smbios", QEMU_CAPS_SMBIOS_TYPE);
     DO_TEST_PARSE_ERROR("smbios-date", QEMU_CAPS_SMBIOS_TYPE);