linux-kernel - Re: [PATCH v2 5/6] drm/virtio: drop fencing in virtio_gpu_resource_create

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Message-ID: <def6f74a-9817-1bc0-0c4e-b0e2a93a7eb2@tronnes.org>
Date:   Thu, 31 Jan 2019 11:50:25 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc:     David Airlie <airlied@...ux.ie>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH v2 5/6] drm/virtio: drop fencing in
 virtio_gpu_resource_create_ioctl



Den 30.01.2019 10.43, skrev Gerd Hoffmann:
> There is no need to wait for completion here.
> 
> The host will process commands in submit order, so commands can
> reference the new resource just fine even when queued up before
> completion.
> 
> On the guest side there is no need to wait for completion too.  Which
> btw is different from resource destroy, where we have to make sure the
> host has seen the destroy and thus doesn't use it any more before
> releasing the pages backing the resource.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---

Acked-by: Noralf Trønnes <noralf@...nnes.org>