linux-kernel - RE: [RFC PATCH v3 0/4] Deliver vGPU display vblank event to userspace

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Message-ID: <237F54289DF84E4997F34151298ABEBC876835E5@SHSMSX101.ccr.corp.intel.com>
Date:   Thu, 27 Jun 2019 08:44:15 +0000
From:   "Zhang, Tina" <tina.zhang@...el.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
CC:     "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>,
        "Lv, Zhiyuan" <zhiyuan.lv@...el.com>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Yuan, Hang" <hang.yuan@...el.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>
Subject: RE: [RFC PATCH v3 0/4] Deliver vGPU display vblank event to
 userspace



> -----Original Message-----
> From: Gerd Hoffmann [mailto:kraxel@...hat.com]
> Sent: Thursday, June 27, 2019 2:23 PM
> To: Zhang, Tina <tina.zhang@...el.com>
> Cc: intel-gvt-dev@...ts.freedesktop.org; kvm@...r.kernel.org; linux-
> kernel@...r.kernel.org; zhenyuw@...ux.intel.com; Lv, Zhiyuan
> <zhiyuan.lv@...el.com>; Wang, Zhi A <zhi.a.wang@...el.com>; Tian, Kevin
> <kevin.tian@...el.com>; Yuan, Hang <hang.yuan@...el.com>;
> alex.williamson@...hat.com
> 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