run Xorg rootless without any input devices (or even tty?)
youssef.ghorbal at pasteur.fr
Thu Apr 9 18:22:18 UTC 2020
It's really work in progress for now, nothing really functional, but I'll post something when I have a functional prototype.
> On 9 Apr 2020, at 14:01, Sylvain Leroux <sylvain at chicoree.fr> wrote:
> Bonjour Youssef,
> Sorry, I don't have the answer to your quetion, but I'm interested by
> your use case. Did you document your setup somewhere?
> On 09/04/2020 13:35, Youssef GHORBAL wrote:
>> I have a special use case in an HPC environement when we want to run Xorg for 3D acceleration purposes only (basically creating GL contexts)
>> It's what VirtualGL uses to render (server side) GL accelerated apps.
>> When a user is allocated a slot on an HPC compute node with a GPU card, we expect it to be able to run an Xorg (under his identity) bound to the GPU card allocated to him.
>> I think the rootless Xorg topic was alread discussed elsewhere in different distrib channels (Arch, Ubuntu etc) but it was always under the assumtion that we needed a fullly featured Xorg (with displays, input devices, etc) whereas in my use case I just want an Xorg screen for GLX.
>> For now, I can't run Xorg without handing it a tty, so I have to preallocate a tty for a user (and manage the permissions on it) and since Xorg is not able to access input devices I have this message (but Xorg starts neverthelss):
>> xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
>> My questions would be:
>> - Is there any way/trick to avoid allocating a tty for Xorg (and thus avoid managing tty allocations and permissions)? (maybe this does'nt make sense at all)
>> - Is there any way/trick to avoid Xorg to probe for any input devices at all?
>> Thank you for your help.
>> Youssef Ghorbal
>>  https://virtualgl.org/vgldoc/2_2_1/x11transport.png
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