Re: AMD Working On VirtIO GPU Support For Xen Virtualization issues

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

Hi Zewei,

Did you manage to make progress on this issue?

I apologize for answering so late, but this email fell through the
cracks,

Cheers,

Stefano


On Mon, 20 Nov 2023, ZHANG Zewei wrote:
> INTERNAL & PARTNERS
> 
> 
> Hi，Xen-devel：
> 
>        We are trying to implement the igpu sharing function for domU on the 
> AMD (v2000 series) development board environment, and the
> software architecture is xen + ubuntu 22.04 (dom0) + Ubuntu 22.04 (Dom U). We 
> found that AMD engineers like Mr. Huang @ray.huang@xxxxxxx
> have posted information about virtio-gpu  for Xen virtualization to the open 
> source community and uploaded the relevant code.
> 
>  
> 
>        And We refer to the relevant information linked below to deploy on my 
> AMD hardware platform:
> 
> [RFC PATCH 0/5] Add Xen PVH dom0 support for GPU - Huang Rui (kernel.org)
> 
>  
> 
>        However, when we deploy virtio-GPU related software, we encounter the 
> following issues:
> 
> 1.    My code of xen /qemu /Virglrenderer checkout to the upstream-for-xen or 
> upstream-for-xen-v2 branch, the xl configuration file is set
> as follows, see< ubuntuhvm_virtIO-gpu.cfg>:
> 
>               device_model_args_hvm= ["-display", "sdl,gl=on", "-device", 
> "virtio-vga-gl,context_init=true,blob=true,hostmem=4G"]
> 
>  
> 
> 2.    After the domU is started with the xl command, qemu and xen hypervisor 
> will report the following errors:
> 
>          xen hypervisor report < xl_dmesg_upstream-for-xen-v2.txt>:
> 
>               (XEN) d0v8 Over-allocation for d1: 1048833 > 1048832
> 
> (XEN) common/memory.c:277:d0v8 Could not allocate order=0 extent: id=1 
> memflags=0xc0 (192 of 2048)
> 
>               qemu report  in log file < qemu-dm-ubuntuU_b.hvm.log>:
> 
>               qemu-system-i386: -device 
> virtio-vga-gl,context_init=true,blob=true,hostmem=4G: xen: failed to populate 
> ram at 110080000
> 
>  
> 
> 3.    I tried to start pvh dom0 but it didn't work, it looks the same 
> regardless of whether I'm using upstream-for-xen-v2 or
> upstream-for-xen branch linux ：
> 
> Logs in attachment:< serial_xen_hypervisor-linux-upstream-for-xen-v2.txt>
> 
>  
> 
>  
> 
>        So I have some questions for you :
> 
> 1.     Does Dom 0 need to be configured with PVH for VirtIO-GPU?
> 
> 2.     What may cause the above issues?
> 
>  
> 
> We look forward to hearing from you!
> 
>  
> 
> Thanks & Best regards!
> 
>  
> 
>  
> 
>  
> 
>  
> 
>  
> 
> 
> 5acXjzUk
> 
> 
>