linux has P2P-DMA for this. The drivers, devices and bus topology need to support it though.
https://docs.kernel.org/driver-api/pci/p2pdma.html
I think GP means 1TB of PCIe bandwidth, instead of 1TB of PCIe NVMe drives.
alt Hacker News
I think GP means 1TB of PCIe bandwidth, instead of 1TB of PCIe NVMe drives.