qemu: vfio-ap device support

Adjusting domain format documentation, adding device address
support and adding command line generation for vfio-ap.
Since only one mediated hostdev with model vfio-ap is supported a check
disallows to define domains with more than one such hostdev device.

Signed-off-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Bjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: Chris Venteicher <cventeic@redhat.com>

docs/formatdomain.html.in

@@ -4616,8 +4616,9 @@
           <dd>For mediated devices (<span class="since">Since 3.2.0</span>)
           the <code>model</code> attribute specifies the device API which
           determines how the host's vfio driver will expose the device to the
-          guest. Currently, <code>model='vfio-pci'</code> and
+          guest. Currently, <code>model='vfio-pci'</code>,
           <code>model='vfio-ccw'</code> (<span class="since">Since 4.4.0</span>)
+          and <code>model='vfio-ap'</code> (<span class="since">Since 4.9.0</span>)
           is supported. <a href="drvnodedev.html#MDEV">MDEV</a> section
           provides more information about mediated devices as well as how to
           create mediated devices on the host.

docs/schemas/domaincommon.rng

@@ -4618,6 +4618,7 @@
       <choice>
         <value>vfio-pci</value>
         <value>vfio-ccw</value>
+        <value>vfio-ap</value>
       </choice>
     </attribute>
     <optional>

src/conf/domain_conf.c

@@ -4275,6 +4275,31 @@ virDomainDefPostParseGraphics(virDomainDef *def)
 }
 
 
+static int
+virDomainDefPostParseHostdev(virDomainDefPtr def)
+{
+    size_t i;
+    bool vfioap_found = false;
+
+    /* verify settings of hostdevs vfio-ap */
+    for (i = 0; i < def->nhostdevs; i++) {
+        virDomainHostdevDefPtr hostdev = def->hostdevs[i];
+
+        if (virHostdevIsMdevDevice(hostdev) &&
+            hostdev->source.subsys.u.mdev.model == VIR_MDEV_MODEL_TYPE_VFIO_AP) {
+            if (vfioap_found) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("Only one hostdev of model vfio-ap is "
+                                 "supported"));
+                return -1;
+            }
+            vfioap_found = true;
+        }
+    }
+    return 0;
+}
+
+
 /**
  * virDomainDriveAddressIsUsedByDisk:
  * @def: domain definition containing the disks to check
@@ -5185,6 +5210,9 @@ virDomainDefPostParseCommon(virDomainDefPtr def,
 
     virDomainDefPostParseGraphics(def);
 
+    if (virDomainDefPostParseHostdev(def) < 0)
+        return -1;
+
     if (virDomainDefPostParseCPU(def) < 0)
         return -1;
 

src/qemu/qemu_command.c

@@ -5476,6 +5476,14 @@ qemuBuildHostdevCommandLine(virCommandPtr cmd,
                     return -1;
                 }
                 break;
+            case VIR_MDEV_MODEL_TYPE_VFIO_AP:
+                if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VFIO_AP)) {
+                    virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                                   _("VFIO AP device assignment is not "
+                                     "supported by this version of QEMU"));
+                    return -1;
+                }
+                break;
             case VIR_MDEV_MODEL_TYPE_LAST:
             default:
                 virReportEnumRangeError(virMediatedDeviceModelType,

src/qemu/qemu_domain_address.c

@@ -294,6 +294,10 @@ qemuDomainPrimeVfioDeviceAddresses(virDomainDefPtr def,
             subsys->u.mdev.model == VIR_MDEV_MODEL_TYPE_VFIO_CCW &&
             def->hostdevs[i]->info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE)
             def->hostdevs[i]->info->type = type;
+
+        if (virHostdevIsMdevDevice(def->hostdevs[i]) &&
+            subsys->u.mdev.model == VIR_MDEV_MODEL_TYPE_VFIO_AP)
+            def->hostdevs[i]->info->type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE;
     }
 }
 

src/util/virmdev.c

@@ -48,7 +48,8 @@ struct _virMediatedDeviceList {
 
 VIR_ENUM_IMPL(virMediatedDeviceModel, VIR_MDEV_MODEL_TYPE_LAST,
               "vfio-pci",
-              "vfio-ccw")
+              "vfio-ccw",
+              "vfio-ap")
 
 static virClassPtr virMediatedDeviceListClass;
 

src/util/virmdev.h

@@ -27,6 +27,7 @@
 typedef enum {
     VIR_MDEV_MODEL_TYPE_VFIO_PCI = 0,
     VIR_MDEV_MODEL_TYPE_VFIO_CCW = 1,
+    VIR_MDEV_MODEL_TYPE_VFIO_AP  = 2,
 
     VIR_MDEV_MODEL_TYPE_LAST
 } virMediatedDeviceModelType;