[pve-devel] [PATCH common/qemu-server/manager] improve vGPU (mdev) usage for NVIDIA

[Dominik Csapak]

On 8/22/22 15:39, DERUMIER, Alexandre wrote:
> Le 22/08/22 à 12:16, Dominik Csapak a écrit :
>> On 8/17/22 01:15, DERUMIER, Alexandre wrote:
>>> Le 9/08/22 à 10:39, Dominik Csapak a écrit :
>>>> On 8/9/22 09:59, DERUMIER, Alexandre wrote:
>>>>> Le 26/07/22 à 08:55, Dominik Csapak a écrit :
>>>>>> so maybe someone can look at that and give some feedback?
>>>>>> my idea there would be to allow multiple device mappings per node
>>>>>> (instead of one only) and the qemu code would select one automatically
>>>>> Hi Dominik,
>>>>>
>>>>> do you want to create some kind of pool of pci devices in your ""add
>>>>> cluster-wide hardware device mapping" patches series ?
>>>>>
>>>>> Maybe in hardwaremap, allow to define multiple pci address on same
>>>>> node ?
>>>>>
>>>>> Then, for mdev, look if a mdev already exist in 1 of the device.
>>>>> If not, try to create the mdev if 1 device, if it's failing (max
>>>>> number of mdev reached), try to create mdev on the other device,...
>>>>>
>>>>> if not mdev, choose a pci device in the pool not yet detached from
>>>>> host.
>>>>>
>>>>
>>>> yes i plan to do this in my next iteration of the mapping series
>>>> (basically what you describe)
>>> Hi, sorry to be late.
>>>
>>>
>>>> my (rough) idea:
>>>>
>>>> have a list of pci paths in mapping (e.g. 01:00.0;01:00.4;...)
>>>> (should be enough, i don't think grouping unrelated devices (different
>>>> vendor/product) makes much sense?)
>>> yes, that's enough for me. we don't want to mix unrelated devices.
>>>
>>> BTW, I'm finally able to do live migration with nvidia mdev vgpu. (need
>>> to compile the nvidia vfio driver with an option to enable it + add
>>> "-device vfio-pci,x-enable-migration=on,..."
>>
>> nice (what flag do you need on the driver install? i did not find it)
>> i'll see if i can test that on a single card (only have one here)
>>
> 
> 
> I have use 460.73.01 driver.  (last 510 driver don't have the flag and
> code, don't known why)
> https://github.com/mbilker/vgpu_unlock-rs/issues/15
> 
> 
> the flag is NV_KVM_MIGRATION_UAP=1.
> As I didn't known to pass the flag,
> 
> I have simply decompress the driver
> "NVIDIA-Linux-x86_64-460.73.01-grid-vgpu-kvm-v5.run -x"
> edit the "kernel/nvidia-vgpu-vfio/nvidia-vgpu-vfio.Kbuild" to add
> NV_KVM_MIGRATION_UAP=1
> 
> then ./nvidia-installer
> 

thx, i am using the 510.73.06 driver here (official grid driver) and the
dkms source has that flag, so i changed the .Kbuild in my /usr/src folder
and rebuilt it. i'll test it tomorrow