[libvirt] [PATCH] qemu: add sdl opengl support
Maciej Wolny
maciej.wolny at codethink.co.uk
Tue May 8 14:12:48 UTC 2018
On 04/05/18 00:08, John Ferlan wrote:
> BTW: Since your patches add a capability - I would have expected a
> change to add a flag to one (or more) of the
> tests/qemucapabilitiesdata/caps_*.xml files, but none are modified. So
> that means that the feature may not be introspectable, perhaps it's been
> part of qemu since 1.5 or it's something being added to the next qemu
> release. If it's a new feature, then when was it added? If it's been
> there since 1.5, then no capability flag is required.
I'm going to need some help understanding the QEMU capabilities test
(tests/qemucapabilitiestest.c). As I understand it, it run QEMU to get
the capabilities and then compares that to the XML file containing the
expected list of capabilities. What are the *.replies files used for?
And how is it do that on multiple architectures and QEMU versions
at the same time?
>
> How that us determined for sdl is a mystery to me... I usually search
> through the qemu */*.json files. In this case I do find some remnants of
> 'gl' and 'sdl' in qapi/ui.json. But how I read that output is that for
> 2.12 there's 'sdl' in DisplayOptions, but using 'DisplayNoOpts' which
> could mean no options for sdl are allowed, but I'm not sure. Maybe there
> is some change in flight - I don't follow qemu-devel that closely.
>
> If I look back at commit id '937ebba00e' for the spice-gl addition
> (which yes, was one in one patch) - I can relate that to the similar
> spice gl fetch, but looking the recent top of qemu git tree, I don't see
> how this same mechanism can be used to determine whether the running
> qemu supports sdl using gl.
It looks like this option was introduced to QEMU in 0b71a5d5. v2.4.0 is
the earliest release which contains that commit.
>
> So for code and other libvirt specific things...
>
> BTW: The docs/formatdomain.html.in to add/describe the 'gl' option for
> 'sdl' needs to be provided.
>
>> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
>> index 3569b9212..a2ef93c09 100644
>> --- a/docs/schemas/domaincommon.rng
>> +++ b/docs/schemas/domaincommon.rng
>> @@ -3031,6 +3031,14 @@
>> <ref name="virYesNo"/>
>> </attribute>
>> </optional>
>> + <optional>
>> + <element name="gl">
>> + <attribute name="enable">
>> + <ref name="virYesNo"/>
>> + </attribute>
>> + <empty/>
>> + </element>
>> + </optional>
>
> I assume this is a copy of the spice gl - to reduce cut-paste-copy, you
> could create a "name" for it and share that name between spice and sdl.
> It's a common thing to do. Not required, but not difficult either.
>
>> </group>
>> <group>
>> <attribute name="type">
>> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
>> index b0257068d..7d65ca9df 100644
>> --- a/src/conf/domain_conf.c
>> +++ b/src/conf/domain_conf.c
>> @@ -13448,6 +13448,7 @@ static int
>> virDomainGraphicsDefParseXMLSDL(virDomainGraphicsDefPtr def,
>> xmlNodePtr node)
>> {
>> + xmlNodePtr cur;
>> char *fullscreen = virXMLPropString(node, "fullscreen");
>> int ret = -1;
>>
>> @@ -13468,6 +13469,34 @@ virDomainGraphicsDefParseXMLSDL(virDomainGraphicsDefPtr def,
>> def->data.sdl.xauth = virXMLPropString(node, "xauth");
>> def->data.sdl.display = virXMLPropString(node, "display");
>>
>> + cur = node->children;
>> + while (cur != NULL) {
>> + if (cur->type == XML_ELEMENT_NODE) {
>> + if (virXMLNodeNameEqual(cur, "gl")) {
>> + char *enable = virXMLPropString(cur, "enable");
>> + int enableVal;
>> +
>> + if (! enable) {
>> + virReportError(VIR_ERR_XML_ERROR, "%s",
>> + _("sdl gl element missing enable"));
>> + goto cleanup;
>> + }
>> +
>> + enableVal = virTristateBoolTypeFromString(enable);
>> + if (enableVal < 0) {
>> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
>> + _("unknown enable value '%s'"), enable);
>> + VIR_FREE(enable);
>> + goto cleanup;
>> + }
>> + VIR_FREE(enable);
>> +
>> + def->data.sdl.gl = enableVal;
>> + }
>> + }
>> + cur = cur->next;
>> + }
>> +
>
> I see this is just a copy of what Spice does, which probably needed some
> adjustment anyway... IIRC: Peter Krempa recently went through an
> exercise with the storage to change a number of these while loops using
> virXMLNodeNameEqual into more direct XML searches. Since this is only
> one element and attribute, I don't really think this loop is useful. I
> know it's possible to get the data via another means and some of the
> code already does that. The exact lines I'll leave to you to hash out.
>
>> ret = 0;
>> cleanup:
>> VIR_FREE(fullscreen);
>> @@ -25652,6 +25681,18 @@ virDomainGraphicsDefFormat(virBufferPtr buf,
>> if (def->data.sdl.fullscreen)
>> virBufferAddLit(buf, " fullscreen='yes'");
>>
>> + if (!children && def->data.sdl.gl) {
>
> This should be a comparison such as "def->data.sdl.gl !=
> VIR_TRISTATE_BOOL_ABSENT" (I know it's logically the same, but
> daata.sdl.gl is not a boolean or a pointer).
>
>> + virBufferAddLit(buf, ">\n");
>> + virBufferAdjustIndent(buf, 2);
>> + children = true;
>> + }
>> +
>> + if (def->data.sdl.gl) {
>
> Similarly... yes, I know spice.gl isn't doing that.
>
>> + virBufferAsprintf(buf, "<gl enable='%s'",
>> + virTristateBoolTypeToString(def->data.sdl.gl));
>> + virBufferAddLit(buf, "/>\n");
>> + }
>> +
>> break;
>>
>> case VIR_DOMAIN_GRAPHICS_TYPE_RDP:
>> diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
>> index 3c7eccb8c..90071d9c0 100644
>> --- a/src/conf/domain_conf.h
>> +++ b/src/conf/domain_conf.h
>> @@ -1601,6 +1601,7 @@ struct _virDomainGraphicsDef {
>> char *display;
>> char *xauth;
>> bool fullscreen;
>> + virTristateBool gl;
>> } sdl;
>> struct {
>> int port;
>> diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
>> index aa8d350f5..02680502e 100644
>> --- a/src/qemu/qemu_capabilities.c
>> +++ b/src/qemu/qemu_capabilities.c
>> @@ -474,6 +474,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
>> "query-cpus-fast",
>> "disk-write-cache",
>> "nbd-tls",
>> + "sdl-gl",
>> );
>>
>>
>> @@ -2451,6 +2452,7 @@ static struct virQEMUCapsCommandLineProps virQEMUCapsCommandLine[] = {
>> { "vnc", "vnc", QEMU_CAPS_VNC_MULTI_SERVERS },
>> { "chardev", "reconnect", QEMU_CAPS_CHARDEV_RECONNECT },
>> { "sandbox", "elevateprivileges", QEMU_CAPS_SECCOMP_BLACKLIST },
>> + { "sdl", "gl", QEMU_CAPS_SDL_GL },
>> };
>>
>> static int
>> diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
>> index 2afe7ef58..e36611e2a 100644
>> --- a/src/qemu/qemu_capabilities.h
>> +++ b/src/qemu/qemu_capabilities.h
>> @@ -458,6 +458,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
>> QEMU_CAPS_QUERY_CPUS_FAST, /* query-cpus-fast command */
>> QEMU_CAPS_DISK_WRITE_CACHE, /* qemu block frontends support write-cache param */
>> QEMU_CAPS_NBD_TLS, /* NBD server supports TLS transport */
>> + QEMU_CAPS_SDL_GL, /* -sdl gl */
>>
>> QEMU_CAPS_LAST /* this must always be the last item */
>> } virQEMUCapsFlags;
>> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
>> index 418729b98..29214e806 100644
>> --- a/src/qemu/qemu_command.c
>> +++ b/src/qemu/qemu_command.c
>> @@ -7988,6 +7988,7 @@ qemuBuildGraphicsCommandLine(virQEMUDriverConfigPtr cfg,
>> virQEMUCapsPtr qemuCaps,
>> virDomainGraphicsDefPtr graphics)
>> {
>> + virBuffer opt = VIR_BUFFER_INITIALIZER;
>> switch (graphics->type) {
>> case VIR_DOMAIN_GRAPHICS_TYPE_SDL:
>> if (graphics->data.sdl.xauth)
>> @@ -8009,6 +8010,24 @@ qemuBuildGraphicsCommandLine(virQEMUDriverConfigPtr cfg,
>
> Suggestion... Create a patch prior to this one that moves the code for
> VIR_DOMAIN_GRAPHICS_TYPE_SDL into it's own helper - such as
> qemuBuildGraphicsSDLCommandLine.
>
>> * default, since the default changes :-( */
>
> The above comment can be removed in a separate patch since commit id
> '4e8993a2' removed the check for QEMU_CAPS_SDL, although it took until
> commit id '649a9dd7a' to "fix" the QEMU_CAPS_SDL to be X_QEMU_CAPS_SDL
> since the QEMU 1.5 is our new minimum version supported.
>
>> virCommandAddArg(cmd, "-sdl");
>>
>> + if (graphics->data.sdl.gl == VIR_TRISTATE_BOOL_YES) {
>> + if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SDL_GL)) {
>> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
>> + _("This QEMU doesn't support SDL OpenGL"));
>> + return -1;
>> +
>> + }
>> +
>> + virBufferAsprintf(&opt, "gl=%s",
>> + virTristateSwitchTypeToString(graphics->data.sdl.gl));
>> + }
>> +
>> + {
>> + const char *optContent = virBufferCurrentContent(&opt);
>> + if (optContent && STRNEQ(optContent, ""))
>> + virCommandAddArgBuffer(cmd, &opt);
>> + }
>
> With it's own helper ^^this^^ awkward definition in the middle is
> unnecessary I think... In fact, I don't even know why it matters - I
> would think you could just do the virCommandAddArgBuffer right after the
> virBufferAsprintf for "gl=%s"... I think the separate helper will be
> good though in case there's more things added for sdl.
>
> e.g.:
> virCommandAddArgBuffer(cmd, &opt);
> virBufferFreeAndReset(&opt);
>
>
>> +
>> break;
>>
>> case VIR_DOMAIN_GRAPHICS_TYPE_VNC:
>> diff --git a/tests/qemuxml2argvdata/video-virtio-gpu-sdl-gl.args b/tests/qemuxml2argvdata/video-virtio-gpu-sdl-gl.args
>> new file mode 100644
>> index 000000000..4172320ed
>> --- /dev/null
>> +++ b/tests/qemuxml2argvdata/video-virtio-gpu-sdl-gl.args
>> @@ -0,0 +1,28 @@
>> +LC_ALL=C \
>> +PATH=/bin \
>> +HOME=/home/test \
>> +USER=test \
>> +LOGNAME=test \
>> +/usr/bin/qemu-system-i686 \
>> +-name QEMUGuest1 \
>> +-S \
>> +-machine pc,accel=tcg,usb=off,dump-guest-core=off \
>> +-m 1024 \
>> +-smp 1,sockets=1,cores=1,threads=1 \
>> +-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
>> +-no-user-config \
>> +-nodefaults \
>> +-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
>> +server,nowait \
>> +-mon chardev=charmonitor,id=monitor,mode=control \
>> +-rtc base=utc \
>> +-no-shutdown \
>> +-no-acpi \
>> +-boot c \
>> +-usb \
>> +-drive file=/var/lib/libvirt/images/QEMUGuest1,format=qcow2,if=none,\
>> +id=drive-ide0-0-0,cache=none \
>> +-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
>> +-sdl gl=on \
>> +-device virtio-gpu-pci,id=video0,virgl=on,bus=pci.0,addr=0x2 \
>> +-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
>> diff --git a/tests/qemuxml2argvdata/video-virtio-gpu-sdl-gl.xml b/tests/qemuxml2argvdata/video-virtio-gpu-sdl-gl.xml
>> new file mode 100644
>> index 000000000..9dea73fbe
>> --- /dev/null
>> +++ b/tests/qemuxml2argvdata/video-virtio-gpu-sdl-gl.xml
>> @@ -0,0 +1,38 @@
>> +<domain type='qemu'>
>> + <name>QEMUGuest1</name>
>> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
>> + <memory unit='KiB'>1048576</memory>
>> + <currentMemory unit='KiB'>1048576</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='file' device='disk'>
>> + <driver name='qemu' type='qcow2' cache='none'/>
>> + <source file='/var/lib/libvirt/images/QEMUGuest1'/>
>> + <target dev='hda' bus='ide'/>
>> + <address type='drive' controller='0' bus='0' target='0' unit='0'/>
>> + </disk>
>> + <controller type='ide' index='0'/>
>> + <controller type='usb' index='0'/>
>> + <controller type='pci' index='0' model='pci-root'/>
>> + <input type='mouse' bus='ps2'/>
>> + <input type='keyboard' bus='ps2'/>
>> + <graphics type='sdl'>
>> + <gl enable='yes'/>
>> + </graphics>
>> + <video>
>> + <model type='virtio' heads='1'>
>> + <acceleration accel3d='yes'/>
>> + </model>
>> + </video>
>> + <memballoon model='virtio'/>
>> + </devices>
>> +</domain>
>> diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
>> index 5b3bd4a99..0b06699f0 100644
>> --- a/tests/qemuxml2argvtest.c
>> +++ b/tests/qemuxml2argvtest.c
>> @@ -1924,6 +1924,11 @@ mymain(void)
>> QEMU_CAPS_SPICE_GL,
>> QEMU_CAPS_SPICE_RENDERNODE,
>> QEMU_CAPS_DEVICE_VIDEO_PRIMARY);
>> + DO_TEST("video-virtio-gpu-sdl-gl",
>> + QEMU_CAPS_DEVICE_VIRTIO_GPU,
>> + QEMU_CAPS_VIRTIO_GPU_VIRGL,
>> + QEMU_CAPS_SDL_GL,
>> + QEMU_CAPS_DEVICE_VIDEO_PRIMARY);
>
> Newer code should use DO_TEST_CAPS_LATEST, but I think that'll fail
> based on there being no capability defined in latest.
>
> The only reason we're printing the "-sdl gl=on" in the .args file is
> that you've passed the capability here.
>
>> DO_TEST("video-virtio-gpu-secondary",
>> QEMU_CAPS_DEVICE_VIRTIO_GPU,
>> QEMU_CAPS_DEVICE_VIDEO_PRIMARY);
>>
>
> There needs to be an adjustment to qemuxml2xmltest.c as well. That'll
> cause an output file to be generated/compared against as well. Hint,
> use VIR_TEST_REGENERATE_OUTPUT=1 after touching the output file.
>
> John
>
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