From: Gerd Hoffmann <kraxel@redhat.com>
To: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Tina Zhang <tina.zhang@intel.com>,
intel-gvt-dev@lists.freedesktop.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, alex.williamson@redhat.com,
hang.yuan@intel.com, zhiyuan.lv@intel.com
Subject: Re: [PATCH 1/2] vfio: ABI for setting mdev display flip eventfd
Date: Mon, 27 May 2019 14:22:37 +0200 [thread overview]
Message-ID: <20190527122237.uhd7qm62h6wfv5w7@sirius.home.kraxel.org> (raw)
In-Reply-To: <20190527090741.GE29553@zhen-hp.sh.intel.com>
On Mon, May 27, 2019 at 05:07:41PM +0800, Zhenyu Wang wrote:
> On 2019.05.27 16:43:11 +0800, Tina Zhang wrote:
> > Add VFIO_DEVICE_SET_GFX_FLIP_EVENTFD ioctl command to set eventfd
> > based signaling mechanism to deliver vGPU framebuffer page flip
> > event to userspace.
>
> Should we add probe to see if driver can support gfx flip event?
Userspace can simply call VFIO_DEVICE_SET_GFX_FLIP_EVENTFD and see if it
worked. If so -> use the eventfd. Otherwise take the fallback path
(timer based polling). I can't see any advantage a separate feature
probe steps adds.
cheers,
Gerd
next prev parent reply other threads:[~2019-05-27 12:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-27 8:43 [PATCH 0/2] Deliver vGPU page flip event to userspace Tina Zhang
2019-05-27 8:43 ` [PATCH 1/2] vfio: ABI for setting mdev display flip eventfd Tina Zhang
2019-05-27 9:07 ` Zhenyu Wang
2019-05-27 12:22 ` Gerd Hoffmann [this message]
2019-05-28 2:51 ` Zhenyu Wang
2019-05-27 14:04 ` Alex Williamson
2019-05-28 1:42 ` Zhang, Tina
2019-05-28 4:18 ` Alex Williamson
2019-05-27 8:43 ` [PATCH 2/2] drm/i915/gvt: Support delivering page flip event to userspace Tina Zhang
2019-05-27 9:11 ` Zhenyu Wang
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