Re: [libvirt] [PATCH] qemu: add spice opengl support
On Thu, 2016-02-18 at 17:39 +0100, Marc-André Lureau wrote:
Add Spice graphics gl attribute. qemu 2.6 should have -spice gl=on
argument to
enable opengl rendering context (patches on the ML). This is necessary to
actually enable virgl rendering.
I don't think we want to merge this before a QEMU version that
supports this attribute has been released. Still, it's good to get
ready ahead of time :)
@@ -4991,6 +4991,12 @@ qemu-kvm -net nic,model=? /dev/null
0.8.8</span>); and <code>usbredir</code>
(<span class="since">since 0.9.12</span>).
</p>
+ <p>
+ Spice may provide accelerated server-side rendering with
+ OpenGL. You can enable or disable OpenGL support explicitly with
+ the <code>gl</code> attribute.
+ (<span class="since">since 1.3.2</span>).
+ </p>
I think this should be a sub-element rather than an attribute, something
like
<graphics type='spice'>
<gl enable='yes'/>
</graphics>
just like eg. the <filetransfer> sub-element.
Also this looks like it's QEMU only, at least for the time being,
which is something worth mentioning in the documentation.
<pre>
<graphics type='spice' port='-1' tlsPort='-1'
autoport='yes'>
<channel name='main' mode='secure'/>
There's an example XML snippet here, you should probably update it.
@@ -10813,6 +10814,20 @@ virDomainGraphicsDefParseXML(xmlNodePtr
node,
VIR_FREE(autoport);
}
+ if ((gl = virXMLPropString(node, "gl")) != NULL) {
You can just use
if ((gl = virXMLPropString(node, "gl"))) {
here, no need to compare explicitly agains NULL.
@@ -6047,6 +6047,17 @@
qemuBuildGraphicsSPICECommandLine(virQEMUDriverConfigPtr cfg,
}
}
+ if (graphics->data.spice.gl) {
+ if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SPICE_GL)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("This QEMU doesn't support spice OpenGL"));
+ goto error;
+ }
+
+ virBufferAsprintf(&opt, ",gl=%s",
+ virTristateSwitchTypeToString(graphics->data.spice.gl));
graphics->data.spice.gl is a virTristateBool, yet you're using
virTristateSwitchTypeToString() on it.
I know you have "yes" / "no" in the XML but need "on" /
"off" for the
QEMU attribute, and I know that virTristateBool and virTristateSwitch
are basically the same thing, but this still looks weird.
I'd rather use something like
switch (graphics->data.spice.gl) {
case VIR_TRISTATE_BOOL_TRUE:
virBufferAsprintf(&opt, ",gl=on");
break;
case VIR_TRISTATE_BOOL_FALSE:
virBufferAsprintf(&opt, ",gl=off");
break;
default:
break;
}
but other people probably feel differently :)
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 349e6ed..542141a 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1458,6 +1458,12 @@ mymain(void)
QEMU_CAPS_DEVICE_VIRTIO_GPU,
QEMU_CAPS_DEVICE_VIRTIO_GPU_VIRGL,
QEMU_CAPS_DEVICE_VIDEO_PRIMARY);
+ DO_TEST("video-virtio-gpu-spice-gl", QEMU_CAPS_DEVICE,
Drop QEMU_CAPS_DEVICE here, we no longer support QEMU versions
that lack -device so that capability is always enabled[1].
Cheers.
[1] Just realized I accidentaly introduced it again in this test
program with one of my recent commits, better clean up :)
--
Andrea Bolognani
Software Engineer - Virtualization Team