The first argument to FdoCreateVmbusChannel is the context of the FDO device. FdoCreateVmbusChannel will call to VmbChannelAllocate and save the reference to the allocated VMBCHANNEL in the stack (local variable):
The first argument to FdoCreateVmbusChannel is the context of the FDO device. FdoCreateVmbusChannel will call to VmbChannelAllocate and save the reference to the allocated VMBCHANNEL in the stack (local variable):