What IPC interface should I use?

**Is your feature request related to a problem? Please describe**

On other multiGPU architecture I use peer2peer memory access.

There is no defined API that I see in SYCL 2020.

There is a defined API in Level 0 API,

https://spec.oneapi.com/level-zero/latest/core/PROG.html?highlight=peer#memory-1

Is this intended for end user use?

**Describe the solution you would like**

I would like to programme in pure an portable SYCL.

A single SYCL interface that maps to peer2peer on Nvidia, AMD and Intel GPUs.

**Describe alternatives you have considered**

Mixing SYCL for single GPU and direct calling level 0 API for peer2peer memory.
This ties the SYCL compile of my library to Intel specific Level0 API for this functionality.

Option to just use MPI for device 2 device, but possibly miss optimisations

**Additional context**

https://github.com/paboyle/Grid/blob/develop/Grid/communicator/SharedMemoryMPI.cc

Line. 495

Need a "#ifdef GRID_SYCL" case here, but not sure which API to use. Level 0 looks viable, but better to be valid SYCL.

Thanks!