Re: [PATCH v14 0/7] drm/i915/gvt: Dma-buf support for GVT-g

From: Gerd Hoffmann <kraxel@redhat.com>
To: Tina Zhang <tina.zhang@intel.com>,
	zhenyuw@linux.intel.com, zhiyuan.lv@intel.com,
	zhi.a.wang@intel.com, kevin.tian@intel.com,
	alex.williamson@redhat.com, chris@chris-wilson.co.uk,
	daniel@ffwll.ch, joonas.lahtinen@linux.intel.com,
	kwankhede@nvidia.com
Cc: intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org
Subject: Re: [PATCH v14 0/7] drm/i915/gvt: Dma-buf support for GVT-g
Date: Fri, 25 Aug 2017 13:47:18 +0200	[thread overview]
Message-ID: <1503661638.9107.9.camel@redhat.com> (raw)
In-Reply-To: <1503051696-5158-1-git-send-email-tina.zhang@intel.com>

On Fri, 2017-08-18 at 18:21 +0800, Tina Zhang wrote:
> v13->v14:
> 1) add PROBE, DMABUF and REGION flags. (Alex)
> 2) return -ENXIO when gem proxy object is banned by ioctl.
>    (Chris) (Daniel)
> 3) add some details about the float pixel format. (Daniel)
> 4) add F suffix to the defined name. (Daniel)
> 5) refine pixel format table. (Zhenyu)

Ok, patch series applies cleanly to 4.13-rc6.  The new flags are
working fine.

However, I see VFIO_DEVICE_QUERY_GFX_PLANE failures which I think
should not be there.  When the guest didn't define a plane yet I get
"No such device" errors instead of a plane_info struct with fields
(drm_format, width, height, size) set to zero.  I also see "Bad
address" errors now and then with no obvious cause.

Cursor support isn't working too.

I'm testing with "-display egl-headless -spice gl=off,port=...".  In
that configuration qemu will import the dma-bufs as textures and reads
them using ReadPixels for display.

qemu branch: https://www.kraxel.org/cgit/qemu/log/?h=work/intel-vgpu

The qemu branch has support for both dmabufs and regions.  The region-
based display code is totaly untested though.

cheers,
  Gerd

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