On Tue, Sep 02, 2025 at 02:13:12PM +0000, Andrew Keesler wrote:
> In 454f4b0f, we started down the path of supporting separate
> configurations per display head (e.g., you have 2 heads - one with
> EDID name "AAA" and the other with EDID name "BBB").
>
> In this change, we add resolution to this configuration surface (e.g.,
> you have 2 heads - one with resolution 111x222 and the other with
> resolution 333x444).
>
> -display vnc=localhost:0,id=aaa,display=vga,head=0 \
> -display vnc=localhost:1,id=bbb,display=vga,head=1 \
> -device '{"driver":"virtio-vga",
> "max_outputs":2,
> "id":"vga",
> "outputs":[
> {
> "name":"AAA",
> "xres":111,
> "yres":222
> },
> {
> "name":"BBB",
> "xres":333,
> "yres":444
> }
> ]}'
>
> Here is the behavior matrix of the current resolution configuration
> surface (xres/yres) with the new resolution configuration surface
> (outputs[i].xres/yres).
>
> Case: !(xres || yres) && !(outputs[i].has_xres && outputs[i].has_yres)
> Behavior: current behavior - outputs[0] enabled with default xres/yres
>
> Case: (xres || yres) && !(outputs[i].has_xres && outputs[i].has_yres)
> Behavior: current behavior - outputs[0] enabled with xres/yres
>
> Case: !(xres || yres) && (outputs[i].has_xres && outputs[i].has_yres)
> Behavior: new behavior - outputs[i] enabled with outputs[i].xres/yres
>
> Case: (xres || yres) && (outputs[i].has_xres && outputs[i].has_yres)
> Behavior: new behavior - outputs[i] enabled with outputs[i].xres/yres
This commit lacks the Signed-off-by line to assert compliance
with the DCO. Assuming you agree, can you just reply to this
mail with your S-o-b and then I'll queue this.
> ---
> hw/display/virtio-gpu-base.c | 10 ++++++++++
> qapi/virtio.json | 10 ++++++++--
> 2 files changed, 18 insertions(+), 2 deletions(-)
>
> diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
> index 7269477a1c..6adb5312a4 100644
> --- a/hw/display/virtio-gpu-base.c
> +++ b/hw/display/virtio-gpu-base.c
> @@ -233,6 +233,16 @@ virtio_gpu_base_device_realize(DeviceState *qdev,
> g->req_state[0].width = g->conf.xres;
> g->req_state[0].height = g->conf.yres;
>
> + for (output_idx = 0, node = g->conf.outputs;
> + node && output_idx < g->conf.max_outputs;
> + output_idx++, node = node->next) {
> + if (node->value->has_xres && node->value->has_yres) {
> + g->enabled_output_bitmask |= (1 << output_idx);
> + g->req_state[output_idx].width = node->value->xres;
> + g->req_state[output_idx].height = node->value->yres;
> + }
> + }
> +
> g->hw_ops = &virtio_gpu_ops;
> for (i = 0; i < g->conf.max_outputs; i++) {
> g->scanout[i].con =
> diff --git a/qapi/virtio.json b/qapi/virtio.json
> index 9d652fe4a8..9469c63e81 100644
> --- a/qapi/virtio.json
> +++ b/qapi/virtio.json
> @@ -966,15 +966,21 @@
> ##
> # @VirtIOGPUOutput:
> #
> -# Describes configuration of a VirtIO GPU output.
> +# Describes configuration of a VirtIO GPU output. If both xres and
> +# yres are set, they take precedence over root virtio-gpu
> +# resolution configuration and enable the corresponding output.
> #
> # @name: the name of the output
> #
> +# @xres: horizontal resolution of the output in pixels (since 10.2)
> +#
> +# @yres: vertical resolution of the output in pixels (since 10.2)
> +#
> # Since: 10.1
> ##
>
> { 'struct': 'VirtIOGPUOutput',
> - 'data': { 'name': 'str' } }
> + 'data': { 'name': 'str', '*xres': 'uint16', '*yres': 'uint16' } }
>
> ##
> # @DummyVirtioForceArrays:
> --
> 2.51.0.338.gd7d06c2dae-goog
>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
