I am writing some proof of concept code for KVM for communication between Windows 10 and a Host Linux system.
What I have is a virtual RAM device that is actually connected to a shared memory segment on the Host. The PCIe BAR 2 is a direct mapping to this RAM.
My intent is to provide a high bandwidth low latency means of transferring data that doesn't involve other common means used (sockets, etc). ZeroCopy would be ideal.
So far I have pretty much everything working, I have written a driver that calls MmAllocateMdlForIoSpace and then maps the memory using MmMapLockedPagesSpecifyCache to user mode via a DeviceIOControl. This works perfectly, the user mode application is able to address the shared memory and write to it.
What I am missing is the ability to use CreateFileMapping in user mode to obtain a HANDLE to a mapping of this memory. I am fairly new to windows driver programming and as such I am uncertain as to if this is even possible. Any pointers as to the best way to achieve this would be very helpful.