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From: "kraxel@redhat.com" <kraxel@redhat.com>
To: "Zhang, Tina" <tina.zhang@intel.com>
Cc: "intel-gvt-dev@lists.freedesktop.org" 
	<intel-gvt-dev@lists.freedesktop.org>,
	"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Yuan, Hang" <hang.yuan@intel.com>,
	"Lv, Zhiyuan" <zhiyuan.lv@intel.com>
Subject: Re: [PATCH v5 0/6] Deliver vGPU display refresh event to userspace
Date: Thu, 5 Sep 2019 09:48:57 +0200
Message-ID: <20190905074857.n3akutnoarnfvg4y@sirius.home.kraxel.org> (raw)
In-Reply-To: <237F54289DF84E4997F34151298ABEBC8771E7AE@SHSMSX101.ccr.corp.intel.com>

  Hi,

> Option 2: QEMU provides the emulated display refresh event to the
> vgpus provided by vendor driver. For vgpus, the display refresh event
> can be considered as the vblank event which is leveraged by guest
> window manager to do the plane update or mode-setting.

> People are asking if option 2 could be a better choice.

Certainly worth trying, maybe it even makes sense to implement both and
let qemu pick one, possibly even switch them at runtime.

qemu can change the refresh rate.  vnc and sdl use that to reduce the
refresh rate in case nobody is looking (no vnc client connected, sdl
window minimized).  It surely makes sense to make that visible to the
guest so it can throttle display updates too.  I'm not sure vblank is
the way to go though, guests might run into vblank irq timeouts in case
the refresh rate is very low ...

cheers,
  Gerd


  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-16  2:35 Tina Zhang
2019-08-16  2:35 ` [PATCH v5 1/6] vfio: Define device specific irq type capability Tina Zhang
2019-08-16 20:51   ` Alex Williamson
2019-08-20  0:56     ` Zhang, Tina
2019-08-16  2:35 ` [PATCH v5 2/6] vfio: Introduce vGPU display irq type Tina Zhang
2019-08-16 20:51   ` Alex Williamson
2019-08-20  2:12     ` Zhang, Tina
2019-08-20  7:20       ` kraxel
2019-08-20 15:03         ` Alex Williamson
2019-08-20 15:32       ` Alex Williamson
2019-08-16  2:35 ` [PATCH v5 3/6] drm/i915/gvt: Register vGPU display event irq Tina Zhang
2019-08-16  2:35 ` [PATCH v5 4/6] drm/i915/gvt: Deliver vGPU refresh event to userspace Tina Zhang
2019-08-26  7:55   ` Zhenyu Wang
2019-08-28  1:49     ` Tian, Kevin
2019-08-28  6:59       ` Zhang, Tina
2019-08-28  7:10         ` Tian, Kevin
2019-08-28  7:39           ` Zhang, Tina
2019-08-16  2:35 ` [PATCH v5 5/6] drm/i915/gvt: Deliver async primary plane page flip events at vblank Tina Zhang
2019-08-16  2:35 ` [PATCH v5 6/6] drm/i915/gvt: Add cursor plane reg update trap emulation handler Tina Zhang
2019-09-03  1:26 ` [PATCH v5 0/6] Deliver vGPU display refresh event to userspace Zhang, Tina
2019-09-03  7:43   ` Tian, Kevin
2019-09-05  7:48   ` kraxel [this message]
2019-09-17  9:27     ` Zhang, Tina

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