CC on Blackwell

[YurkoWasHere]

Is there any support for CC on Blackwell GPUs yet?

If there is would it be part of this repo?

[Tan-YiFan]

CC would be enabled on Blackwell. You can refer to https://www.nvidia.com/en-us/data-center/technologies/blackwell-architecture/

[YurkoWasHere]

I guess the better question would be would bounce buffer be supported on blackwell,

as i understand it the new pcie v6 spec of encrypting pcie communication wont be ready for some time.

[Tan-YiFan]

Blackwell would support TEE I/O, allowing the GPU to directly read data from CVM private memory. Bounce buffer on CVM is not used during data transfer.

[YurkoWasHere]

AFAIK TEE I/O is next gen pcie and probably wont ship for at least a year after Blackwell drops. (I think Intel called it TDX Connect, not sure what the AMD branding is)

If this is incorrect i would love to learn more about possible time lines, otherwise i fear the only way to be early CC on Blackwell is a bounce buffer.

[Tan-YiFan]

Yes, it is called TDX connect in Intel TDX.

TDX connect (or TEE I/O) is based on PCIE TDISP (a feature in PCIE 5.0). Could you share with me what feature of TEE I/O is in next gen PCIE?

https://www.nvidia.com/en-us/data-center/technologies/blackwell-architecture/ says blackwell supports TDX I/O.

[Tan-YiFan]

The latest version of nvidia open gpu kernel has some updates on Blackwell CC: https://github.com/NVIDIA/open-gpu-kernel-modules/blob/565.57.01/src/nvidia/src/kernel/gpu/conf_compute/arch/blackwell/conf_compute_gb100.c

@rnertney @steven-bellock Could you provide further information?