linux-kernel - Re: [PATCH v18 0/6] drm/i915/gvt: Dma-buf support for GVT-g

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 15 Nov 2017 15:48:06 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     Tina Zhang <tina.zhang@...el.com>, chris@...is-wilson.co.uk,
        joonas.lahtinen@...ux.intel.com, zhenyuw@...ux.intel.com,
        zhiyuan.lv@...el.com, zhi.a.wang@...el.com, kevin.tian@...el.com,
        daniel@...ll.ch, kwankhede@...dia.com, hang.yuan@...el.com,
        intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v18 0/6] drm/i915/gvt: Dma-buf support for GVT-g

On Wed, 15 Nov 2017 11:49:00 +0100
Gerd Hoffmann <kraxel@...hat.com> wrote:

> On Wed, Nov 15, 2017 at 05:11:49PM +0800, Tina Zhang wrote:
> > v17->v18:
> > 1) unmap vgpu's opregion when destroying vgpu.
> > 2) update comments for VFIO_DEVICE_GET_GFX_DMABUF. (Alex)  
> 
> > This patch set adds the dma-buf support for intel GVT-g.
> > 
> > dma-buf is an uniform mechanism to share DMA buffers across different
> > devices and subsystems. dma-buf for intel GVT-g is mainly used to share
> > the vgpu's framebuffer to userspace to leverage userspace graphics stacks
> > to render the framebuffer to the display monitor.
> > 
> > The main idea is that we create a gem object and set vgpu's framebuffer as
> > its backing storage. Then, export a dma-buf associated with this gem object.
> > With the fd of this dma-buf, userspace can directly handle this buffer.
> > 
> > This patch set can be tried with the following example:
> > 	git://git.kraxel.org/qemu  branch: work/intel-vgpu
> > 
> > A topic branch with the latest patch set is:
> >         https://github.com/intel/gvt-linux.git   branch: topic/dmabuf  
> 
> Tested-by: Gerd Hoffmann <kraxel@...hat.com>

Hi Gerd,

Can you share the xml snippets required for the VM to make this work?
Last I tried I couldn't get the display/video/hostdev configuration to
get any enhanced behavior through the dmabuf.  Thanks,

Alex