Implement USM support for XRT plugin

[keryell]

[j-stephan]

Soooo... any news on this? :-)

[keryell]

No, but we are thinking to it.
I think just the sycl::malloc_device could be done, perhaps sycl::malloc_host too. Do not even think about sycl::malloc_shared.
What model do you need?
@gauthier The idea would be to use a xrt::bo and just call address() member function in the XRT PI to implement sycl::malloc_device.
There are the flags bo::flags::device_only, host_only and svm.
@stsoe I hope that host_only still allows the device to use the buffer through PCIe in an Alveo U200 for example?
Probably they might need some specific attribute on the Vitis HLS kernel arguments too.

[j-stephan]

Thanks for letting me know. For the beginning, malloc_{device,host} would be sufficient.