Has anyone successfully made a non-CC GPU and CVM work together?
GPUs perform Direct Memory Access (DMA) to push/pull data from the CVM.
CPUs that use TDX or SEV-SNP configure their MMUs to explicitly forbid non-CVM accesses. In fact, they will page fault if anyone/anything attempts to access their secure pages.
One could, in theory, modify our openRM driver (on GitHub) to set our buffers to shared, but this is unfortunately unsupported.
What are you trying to test?