From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steve Longerbeam <slongerbeam@gmail.com>
Subject: Re: [PATCH 0/2] staging: vboxvideo: Add page-flip support
Date: Thu, 30 Aug 2018 14:48:45 -0700
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To: Daniel Vetter <daniel@ffwll.ch>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Alex Deucher <alexander.deucher@amd.com>, =?UTF-8?Q?Christian_K=c3=b6nig?= <christian.koenig@amd.com>, Hans de Goede <hdegoede@redhat.com>, Roger He <Hongbo.He@amd.com>
Cc: devel@driverdev.osuosl.org, Steve Longerbeam <steve_longerbeam@mentor.com>, dri-devel@lists.freedesktop.org
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Hi all,

On 08/07/2018 02:57 PM, Steve Longerbeam wrote:
>
>
> On 08/06/2018 01:34 AM, Daniel Vetter wrote:
>> On Fri, Jul 20, 2018 at 10:17:29AM -0700, Steve Longerbeam wrote:
>>> Adds crtc page-flip support by passing the new requested framebuffer
>>> to vbox_crtc_do_set_base().
>>>
>>> There is no attempt to support vblank interrupts, so this page-flip
>>> implementation does not try to sync the page-flip to vertical blanking,
>>> so expect tearing effects. Is it possible to access the host vblank
>>> intervals in VBOX?
>> I think it'd be great to move vboxvideo over to atomic instead, which is
>> required for destaging anyway, and would give you page flip support for
>> free.
>
> Hi Daniel, yes I agree vboxvideo needs to move to the DRM atomic
> framework.
>

Irrespective of moving vboxvideo to atomic framework, I still need to get an
answer to the question, is it possible to access the host vblank 
intervals in
order to sync page-flip to vblank, to prevent tearing. Is this possible 
somehow,
perhaps by calling into the VBOX hypervisor?

Thanks,
Steve