Re: [PATCH v3 1/1] Support per-head resolutions with virtio-gpu

["Daniel P. Berrangé" <berrange@redhat.com>]

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
> ---
>  hw/display/virtio-gpu-base.c | 10 ++++++++++
>  qapi/virtio.json             | 10 ++++++++--
>  2 files changed, 18 insertions(+), 2 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


With regards,
Daniel
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