Re: [Xen-devel] [Notes for xen summit 2018 design session] Graphic virtualization

[Artem Mygaiev <artem_mygaiev@xxxxxxxx>]

On 02.08.18 18:57, Julien Grall wrote:
> Hi Artem,
>
> On 02/08/18 16:54, Artem Mygaiev wrote:
> > On 02.08.18 18:29, Lars Kurth wrote:
> > > On 02/08/2018, 16:27, "Artem Mygaiev" <artem_mygaiev@xxxxxxxx> wrote:
> > >
> > >      Hello Julien
> > >      On 02.08.18 12:56, Julien Grall wrote:
> > >      > Hi,
> > >      >
> > >      > Sorry for the late posting. The notes were taken by Stefano 
> > > Stabellini.
> > >      > Thank you.
> > >      >
> > >      > This has some clarifications requested from EPAM regarding 
> > > PowerVR.
> > >      >
> > >      > The existing graphics solutions on Xen today are:
> > >      >     - PV DRM:
> > >      >          * Supports multiple displays per VM
> > >      >          * Based on Grant-tables.
> > >      >          * Improvement of Xen FB which is based on foreign 
> > > mapping
> > >      >
> > >      Frontend driver will be part of LK starting 4.18
> > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/xen?h=v4.18-rc7 
> > >
> > >      >     - Intel GVT: https://01.org/igvt-g
> > >      >          * Based on IOREQ server infrastructure
> > >      >          * Performance is 70% of direct assigned hardware
> > >      >
> > >      >     - NVIDIA:
> > >      >          * Much more virtualizable
> > >      >          * Provide mappable chunk of PCI BARs.
> > >      >          * Userspace component emulates PCI config space
> > >      >
> > >      > Current effort for graphic virtualization on Arm:
> > >      >     - Samsung: They have a PV OpenGL solution. This seems to 
> > > be fast.
> > >      This is interesting. Do you know if there is any open benchmark 
> > > data?
> > > The presentation and recording is at
> > > https://www.slideshare.net/xen_com_mgr/design-and-implementation-of-automotive-xpdds18-virtualization-based-on-xen-sungmin-lee-samsung-electronics 
> > >
> > > https://www.youtube.com/watch?v=mBD8o9X32fA&index=14&list=PLYyw7IQjL-zFlQYbY9BgsLhxqp1Ui67W7 
> > Thanks for pointing to XDS materials. Unfortunately, there is no 
> > comparison with "native" GPU performance (non-virtualized)... I guess 
> > I need to ask Samsung folks for details.
> They do compare with Dom0 (slides 20 and onwards). Dom0 has the direct 
> access to the GPU, so this is very similar to native.
> Did you expect other comparison?
Yes, implementation of sharing may impact Dom0 performance. In this case 
it seems that native GL applications in Dom0 are also reside in SVDM 
somehow (slide 14). I am not saying it is necessary impacting, but it is 
always better to have non-virtualized environment as a reference.
Too bad I couldn't make it to XDS due to conflict with AGL/OSS events :(

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