> -----Original Message-----
> From: Gerd Hoffmann [mailto:[email protected]]
> Sent: Thursday, June 27, 2019 2:23 PM
> To: Zhang, Tina <[email protected]>
> Cc: [email protected]; [email protected]; linux-
> [email protected]; [email protected]; Lv, Zhiyuan
> <[email protected]>; Wang, Zhi A <[email protected]>; Tian, Kevin
> <[email protected]>; Yuan, Hang <[email protected]>;
> [email protected]
> Subject: Re: [RFC PATCH v3 0/4] Deliver vGPU display vblank event to
> userspace
>
> Hi,
>
> > Instead of delivering page flip events, we choose to post display
> > vblank event. Handling page flip events for both primary plane and
> > cursor plane may make user space quite busy, although we have the
> > mask/unmask mechansim for mitigation. Besides, there are some cases
> > that guest app only uses one framebuffer for both drawing and display.
> > In such case, guest OS won't do the plane page flip when the
> > framebuffer is updated, thus the user land won't be notified about the
> updated framebuffer.
>
> What happens when the guest is idle and doesn't draw anything to the
> framebuffer?
The vblank event will be delivered to userspace as well, unless guest OS
disable the pipe.
Does it make sense to vfio/display?
Thanks.
BR,
Tina
>
> cheers,
> Gerd
