qemu: caps: Introduce a capability for egl-headless

Since QEMU 2.10, it's possible to use a new type of display -
egl-headless which uses drm nodes to provide OpenGL support. This patch
adds a capability for that. However, since QEMU doesn't provide a QMP
command to probe it, we have to base the capability on specific QEMU
version.
Acked-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NErik Skultety <eskultet@redhat.com>

src/qemu/qemu_capabilities.c

@@ -503,6 +503,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
               "machine.pseries.cap-hpt-max-page-size",
               "machine.pseries.cap-htm",
               "usb-storage.werror",
+              "egl-headless",
     );
 
 
@@ -4030,6 +4031,11 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
         virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_PSERIES_RESIZE_HPT);
     }
 
+    /* '-display egl-headless' cmdline option is supported since QEMU 2.10, but
+     * there's no way to probe it */
+    if (qemuCaps->version >= 2010000)
+        virQEMUCapsSet(qemuCaps, QEMU_CAPS_EGL_HEADLESS);
+
     /* no way to query for -numa dist */
     if (qemuCaps->version >= 2010000)
         virQEMUCapsSet(qemuCaps, QEMU_CAPS_NUMA_DIST);

src/qemu/qemu_capabilities.h

@@ -487,6 +487,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_MACHINE_PSERIES_CAP_HPT_MAX_PAGE_SIZE, /* -machine pseries.cap-hpt-max-page-size */
     QEMU_CAPS_MACHINE_PSERIES_CAP_HTM, /* -machine pseries.cap-htm */
     QEMU_CAPS_USB_STORAGE_WERROR, /* -device usb-storage,werror=..,rerror=.. */
+    QEMU_CAPS_EGL_HEADLESS, /* -display egl-headless */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;

tests/qemucapabilitiesdata/caps_2.10.0.aarch64.xml

@@ -159,6 +159,7 @@
   <flag name='hda-output'/>
   <flag name='blockdev-del'/>
   <flag name='vhost-vsock'/>
+  <flag name='egl-headless'/>
   <version>2010000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>307647</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.10.0.ppc64.xml

@@ -158,6 +158,7 @@
   <flag name='hda-output'/>
   <flag name='blockdev-del'/>
   <flag name='vhost-vsock'/>
+  <flag name='egl-headless'/>
   <version>2010000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>386992</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.10.0.s390x.xml

@@ -119,6 +119,7 @@
   <flag name='sdl-gl'/>
   <flag name='blockdev-del'/>
   <flag name='vhost-vsock'/>
+  <flag name='egl-headless'/>
   <version>2010000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>307899</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.10.0.x86_64.xml

@@ -203,6 +203,7 @@
   <flag name='vmgenid'/>
   <flag name='vhost-vsock'/>
   <flag name='mch'/>
+  <flag name='egl-headless'/>
   <version>2010000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>367995</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.11.0.s390x.xml

@@ -126,6 +126,7 @@
   <flag name='blockdev-del'/>
   <flag name='vhost-vsock'/>
   <flag name='tpm-emulator'/>
+  <flag name='egl-headless'/>
   <version>2011000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>346751</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.11.0.x86_64.xml

@@ -207,6 +207,7 @@
   <flag name='tpm-emulator'/>
   <flag name='mch'/>
   <flag name='mch.extended-tseg-mbytes'/>
+  <flag name='egl-headless'/>
   <version>2011000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>371455</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.12.0.aarch64.xml

@@ -169,6 +169,7 @@
   <flag name='vhost-vsock'/>
   <flag name='chardev-fd-pass'/>
   <flag name='tpm-emulator'/>
+  <flag name='egl-headless'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>347550</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.12.0.ppc64.xml

@@ -167,6 +167,7 @@
   <flag name='chardev-fd-pass'/>
   <flag name='tpm-emulator'/>
   <flag name='machine.pseries.cap-htm'/>
+  <flag name='egl-headless'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>428334</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.12.0.s390x.xml

@@ -133,6 +133,7 @@
   <flag name='vhost-vsock'/>
   <flag name='chardev-fd-pass'/>
   <flag name='tpm-emulator'/>
+  <flag name='egl-headless'/>
   <version>2012000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>375999</microcodeVersion>

tests/qemucapabilitiesdata/caps_2.12.0.x86_64.xml

@@ -211,6 +211,7 @@
   <flag name='mch'/>
   <flag name='mch.extended-tseg-mbytes'/>
   <flag name='sev-guest'/>
+  <flag name='egl-headless'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>416196</microcodeVersion>

tests/qemucapabilitiesdata/caps_3.0.0.ppc64.xml

@@ -167,6 +167,7 @@
   <flag name='tpm-emulator'/>
   <flag name='machine.pseries.cap-hpt-max-page-size'/>
   <flag name='machine.pseries.cap-htm'/>
+  <flag name='egl-headless'/>
   <version>2012050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>446771</microcodeVersion>

tests/qemucapabilitiesdata/caps_3.0.0.x86_64.xml

@@ -214,6 +214,7 @@
   <flag name='mch.extended-tseg-mbytes'/>
   <flag name='sev-guest'/>
   <flag name='usb-storage.werror'/>
+  <flag name='egl-headless'/>
   <version>2012090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>438109</microcodeVersion>