On 10/1/25 6:43 PM, Alexandre Courbot wrote:
> On Thu Oct 2, 2025 at 6:13 AM JST, Zhi Wang wrote:
>> On 1.10.2025 17.48, Jason Gunthorpe wrote:
>>> On Wed, Oct 01, 2025 at 08:09:37AM +0000, Zhi Wang wrote:
...
>> Right, I also mentioned the same use cases of NIC/GPU in another reply
>> to Danilo. But what I get is NVIDIA doesn't use bare metal VF to support
>> linux container, it seems there have been other solutions. IMHO, it is
>> not mandatory that we have to support VF driver on bare metal so far
>> yet.
>
> For my education, what gets in the way of supporting a VF on the bare
> metal if we already support it from inside a VM?
Synthesizing a response from what I've learned here:
First of all, the PF and VFs will probe() nova-core with the same
device ID, so nova-core will get multiple probe() calls for the
same device. That has to be handled. (Thanks to Joel for pointing
that out.)
Next, for actual true VF support, nova-core will need to "provision"
the VFs, which I have learned involves the following:
* allocate vidmem (or "VRAM" in DRM terminology)
* set up compute quotas
* configure which GPU features are exposed
thanks,
--
John Hubbard
