conf: gfx: egl-headless: Introduce a new <gl> subelement

Unlike with SPICE and SDL which use the <gl> subelement to enable OpenGL
acceleration, specifying egl-headless graphics in the XML has
essentially the same meaning, thus in case of egl-headless we don't have
a need for the 'enable' element attribute and we'll only be interested
in the 'rendernode' one further down the road.
Signed-off-by: NErik Skultety <eskultet@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

docs/formatdomain.html.in

@@ -6704,12 +6704,17 @@ qemu-kvm -net nic,model=? /dev/null
               the other types, for practical reasons it should be paired with
               either <code>vnc</code> or <code>spice</code> graphics types.
               This display type is only supported by QEMU domains
-              (needs QEMU <span class="since">2.10</span> or newer) and doesn't
-              accept any attributes.
+              (needs QEMU <span class="since">2.10</span> or newer).
+              <span class="Since">5.0.0</span> this element accepts a
+              <code>&lt;gl/&gt;</code> sub-element with an optional attribute
+              <code>rendernode</code> which can be used to specify an absolute
+              path to a host's DRI device to be used for OpenGL rendering.
             </p>
             <pre>
 &lt;graphics type='spice' autoport='yes'/&gt;
-&lt;graphics type='egl-headless'/&gt;
+&lt;graphics type='egl-headless'&gt;
+  &lt;gl rendernode='/dev/dri/renderD128'/&gt;
+&lt;/graphics&gt;
             </pre>
           </dd>
         </dl>

docs/schemas/domaincommon.rng

@@ -3418,9 +3418,20 @@
             </attribute>
           </optional>
         </group>
-        <attribute name="type">
-          <value>egl-headless</value>
-        </attribute>
+        <group>
+          <attribute name="type">
+            <value>egl-headless</value>
+          </attribute>
+          <optional>
+            <element name="gl">
+              <optional>
+                <attribute name="rendernode">
+                  <ref name="absFilePath"/>
+                </attribute>
+              </optional>
+            </element>
+          </optional>
+        </group>
       </choice>
     </element>
   </define>

src/conf/domain_conf.c

@@ -14074,6 +14074,24 @@ virDomainGraphicsDefParseXMLSpice(virDomainGraphicsDefPtr def,
 }
 
 
+static int
+virDomainGraphicsDefParseXMLEGLHeadless(virDomainGraphicsDefPtr def,
+                                        xmlNodePtr node,
+                                        xmlXPathContextPtr ctxt)
+{
+    xmlNodePtr save = ctxt->node;
+    xmlNodePtr glNode;
+
+    ctxt->node = node;
+
+    if ((glNode = virXPathNode("./gl", ctxt)))
+        def->data.egl_headless.rendernode = virXMLPropString(glNode,
+                                                             "rendernode");
+    ctxt->node = save;
+    return 0;
+}
+
+
 /* Parse the XML definition for a graphics device */
 static virDomainGraphicsDefPtr
 virDomainGraphicsDefParseXML(xmlNodePtr node,
@@ -14123,6 +14141,9 @@ virDomainGraphicsDefParseXML(xmlNodePtr node,
             goto error;
         break;
     case VIR_DOMAIN_GRAPHICS_TYPE_EGL_HEADLESS:
+        if (virDomainGraphicsDefParseXMLEGLHeadless(def, node, ctxt) < 0)
+            goto error;
+        break;
     case VIR_DOMAIN_GRAPHICS_TYPE_LAST:
         break;
     }
@@ -26852,6 +26873,20 @@ virDomainGraphicsDefFormat(virBufferPtr buf,
         break;
 
     case VIR_DOMAIN_GRAPHICS_TYPE_EGL_HEADLESS:
+        if (!def->data.egl_headless.rendernode)
+            break;
+
+        if (!children) {
+            virBufferAddLit(buf, ">\n");
+            virBufferAdjustIndent(buf, 2);
+            children = true;
+        }
+
+        virBufferAddLit(buf, "<gl");
+        virBufferEscapeString(buf, " rendernode='%s'",
+                              def->data.egl_headless.rendernode);
+        virBufferAddLit(buf, "/>\n");
+        break;
     case VIR_DOMAIN_GRAPHICS_TYPE_LAST:
         break;
     }
@@ -30938,7 +30973,13 @@ virDomainGraphicsDefHasOpenGL(const virDomainDef *def)
 bool
 virDomainGraphicsSupportsRenderNode(const virDomainGraphicsDef *graphics)
 {
-    return graphics->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE;
+    bool ret = false;
+
+    if (graphics->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE ||
+        graphics->type == VIR_DOMAIN_GRAPHICS_TYPE_EGL_HEADLESS)
+        ret = true;
+
+    return ret;
 }
 
 
@@ -30953,6 +30994,8 @@ virDomainGraphicsGetRenderNode(const virDomainGraphicsDef *graphics)
             ret = graphics->data.spice.rendernode;
         break;
     case VIR_DOMAIN_GRAPHICS_TYPE_EGL_HEADLESS:
+        ret = graphics->data.egl_headless.rendernode;
+        break;
     case VIR_DOMAIN_GRAPHICS_TYPE_SDL:
     case VIR_DOMAIN_GRAPHICS_TYPE_VNC:
     case VIR_DOMAIN_GRAPHICS_TYPE_RDP:

src/qemu/qemu_process.c

@@ -4788,14 +4788,25 @@ static int
 qemuProcessGraphicsSetupRenderNode(virDomainGraphicsDefPtr graphics,
                                    virQEMUCapsPtr qemuCaps)
 {
+    char **rendernode = NULL;
+
     if (!virDomainGraphicsNeedsAutoRenderNode(graphics))
         return 0;
 
     /* Don't bother picking a DRM node if QEMU doesn't support it. */
-    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SPICE_RENDERNODE))
-        return 0;
+    if (graphics->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE) {
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SPICE_RENDERNODE))
+            return 0;
+
+        rendernode = &graphics->data.spice.rendernode;
+    } else {
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_EGL_HEADLESS_RENDERNODE))
+            return 0;
+
+        rendernode = &graphics->data.egl_headless.rendernode;
+    }
 
-    if (!(graphics->data.spice.rendernode = virHostGetDRMRenderNode()))
+    if (!(*rendernode = virHostGetDRMRenderNode()))
         return -1;
 
     return 0;

tests/qemuxml2argvdata/graphics-egl-headless-rendernode.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219100</memory>
+  <currentMemory unit='KiB'>219100</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-i686</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='ide' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <graphics type='egl-headless'>
+      <gl rendernode='/dev/dri/foo'/>
+    </graphics>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2xmloutdata/graphics-egl-headless-rendernode.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219100</memory>
+  <currentMemory unit='KiB'>219100</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-i686</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+    </controller>
+    <controller type='ide' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <graphics type='egl-headless'>
+      <gl rendernode='/dev/dri/foo'/>
+    </graphics>
+    <video>
+      <model type='cirrus' vram='16384' heads='1' primary='yes'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+    </video>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2xmltest.c

@@ -413,6 +413,8 @@ mymain(void)
     cfg->spiceAutoUnixSocket = false;
     DO_TEST("graphics-spice-egl-headless", NONE);
 
+    DO_TEST("graphics-egl-headless-rendernode", NONE);
+
     DO_TEST("input-usbmouse", NONE);
     DO_TEST("input-usbtablet", NONE);
     DO_TEST("misc-acpi", NONE);