adding pci devices support for flintlockd

[steve-fraser]

Adding PCI devices support for Filntlockd

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[richardcase]

We should probably model this for future expansion. For example, selecting a GPU for a pool of GPUs on the host.

Something along the lines of what we do with VolumeSource.

Maybe we have something like:

message PCIDevice {
  optional DeviceIDSource = 1;
}

Another option is that we model it on "requests". So the VM requests a PCI device that meets a set of criteria? And may the criteria is a CEL expression which would then cover a number of different options one being by DeviceID? I quite like this approach, its very similar to where Kubernetes is going

[richardcase]

If we used the CEL approach then it could end up being:

message PCIDevice {
string Expression = 1;
}

And then the expression would be something like:

• device.id == "58:00.0"
• device.class == "vga" && device.available

[richardcase]

We could then also use CEL to select PCI devices available to flintlock.

[steve-fraser]

It's an interesting idea. How would you validate the cell expression?

[richardcase]

We'd need a custom data model for the CEL side and populate that with data from /sys/bus/pci/devices and other things.

[richardcase]

Maybe we could go with something like this to not block using the device id directly?:

message PCIDevice {
  optional DeviceIDSource = 1;
  optional Expression= 2; // Add this later
}

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