On Thu, May 12, 2022 at 2:28 AM Jonathon Jongsma <jjongsma@redhat.com> wrote:
On 5/11/22 9:56 AM, Han Han wrote:
On Wed, May 11, 2022 at 12:26 AM Jonathon Jongsma <jjongsma@redhat.com <mailto:jjongsma@redhat.com>> wrote:
Add the ability to enable blob resources for the virtio video device. This will accelerate the display path due to less or no copying of
pixel
data.
Blob resource support can be enabled with e.g.:
<video> <model type='virtio' blob='on'/> </video>
Some additional background information about blob resources:
https://lists.freedesktop.org/archives/dri-devel/2020-August/275972.html
<
https://lists.freedesktop.org/archives/dri-devel/2020-August/275972.html>
https://www.kraxel.org/blog/2021/05/virtio-gpu-qemu-graphics-update/ <
https://www.kraxel.org/blog/2021/05/virtio-gpu-qemu-graphics-update/>
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2032406 <https://bugzilla.redhat.com/show_bug.cgi?id=2032406>
Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com <mailto:jjongsma@redhat.com>> --- docs/formatdomain.rst | 6 ++++++ src/conf/domain_conf.c | 6 ++++++ src/conf/domain_conf.h | 1 + src/conf/domain_validate.c | 13 ++++++++++--- src/conf/schemas/domaincommon.rng | 5 +++++ 5 files changed, 28 insertions(+), 3 deletions(-)
diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index 993c65e50b..2161cc7e30 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -6198,6 +6198,12 @@ A video device. :since:`since 1.3.3` ) extends secondary bar and makes it addressable as 64bit memory.
+ :since:`Since 8.2.0`, devices with type "virtio" have an optional ``blob``
Since 8.4.0 for libvirt.
Oops. Didn't catch that in the rebase.
And please mention the QEMU version 6.1.0
There are a lot of libvirt features that require minimum versions of qemu, but it doesn't look like we generally specify these qemu version requirements in the libvirt documentation. Not sure if I should add it here...
Generally, the minimal required QEMU version is 3.1.0( https://libvirt.org/drvqemu.html): "The libvirt KVM/QEMU driver can manage any QEMU emulator from version 3.1.0 or later" That's to say, a user can use 3.1.0<=QEMU<6.2.0 with current libvirt. So it's better to mention the required QEMU version for 'blob' to help users resolved the unsupported error.
+ attribute that can be set to "on" or "off". Setting ``blob`` to "on" will + enable the use of blob resources in the device. This can accelerate the + display path by reducing or eliminating copying of pixel data between the + guest and host. + :since:`Since 5.9.0` , the ``model`` element may also have an optional ``resolution`` sub-element. The ``resolution`` element has attributes ``x`` and ``y`` to set the minimum resolution for the video device.
This
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 60c27ddd34..ae86f455bd 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -14154,6 +14154,9 @@ virDomainVideoModelDefParseXML(virDomainVideoDef *def, else if (rc == 0) def->heads = 1;
+ if (virXMLPropTristateSwitch(node, "blob", VIR_XML_PROP_NONE, &def->blob) < 0) + return -1; + return 0; }
@@ -26075,6 +26078,9 @@ virDomainVideoDefFormat(virBuffer *buf, virBufferAsprintf(buf, " heads='%u'", def->heads); if (def->primary) virBufferAddLit(buf, " primary='yes'"); + if (def->blob != VIR_TRISTATE_SWITCH_ABSENT) + virBufferAsprintf(buf, " blob='%s'", + virTristateSwitchTypeToString(def->blob)); if (def->accel || def->res) { virBufferAddLit(buf, ">\n"); virBufferAdjustIndent(buf, 2); diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index acd0588e9b..afa6db2403 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -1763,6 +1763,7 @@ struct _virDomainVideoDef { bool primary; virDomainVideoAccelDef *accel; virDomainVideoResolutionDef *res; + virTristateSwitch blob; virDomainVideoDriverDef *driver; virDomainDeviceInfo info; virDomainVirtioOptions *virtio; diff --git a/src/conf/domain_validate.c b/src/conf/domain_validate.c index 18eb8d697d..da0ff06570 100644 --- a/src/conf/domain_validate.c +++ b/src/conf/domain_validate.c @@ -226,9 +226,16 @@ virDomainVideoDefValidate(const virDomainVideoDef *video, } }
- if (video->type != VIR_DOMAIN_VIDEO_TYPE_VIRTIO && - (virDomainCheckVirtioOptionsAreAbsent(video->virtio) < 0)) - return -1; + if (video->type != VIR_DOMAIN_VIDEO_TYPE_VIRTIO) { + if (virDomainCheckVirtioOptionsAreAbsent(video->virtio) < 0) + return -1; + if (video->blob != VIR_TRISTATE_SWITCH_ABSENT) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("video type '%s' does not support blob resources"), + virDomainVideoTypeToString(video->type)); + return -1; + } + }
return 0; } diff --git a/src/conf/schemas/domaincommon.rng b/src/conf/schemas/domaincommon.rng index 2544864eb4..16b3fd9c53 100644 --- a/src/conf/schemas/domaincommon.rng +++ b/src/conf/schemas/domaincommon.rng @@ -4251,6 +4251,11 @@ <ref name="virYesNo"/> </attribute> </optional> + <optional> + <attribute name="blob"> + <ref name="virOnOff"/> + </attribute> + </optional> <optional> <element name="acceleration"> <optional> -- 2.35.1