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

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Message-ID: <20190627062231.57tywityo6uyhmyd@sirius.home.kraxel.org>
Date:   Thu, 27 Jun 2019 08:22:31 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Tina Zhang <tina.zhang@...el.com>
Cc:     intel-gvt-dev@...ts.freedesktop.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, zhenyuw@...ux.intel.com,
        zhiyuan.lv@...el.com, zhi.a.wang@...el.com, kevin.tian@...el.com,
        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?

cheers,
  Gerd