OpenCL Correct way to share Buffers between multiple devices of same platform

I use One context and a command queue for each device.

After every clEnqueueWriteBuffer() i use

clEnqueueMigrateMemObjects(CommandQueue, 1, &Memory, CL_MIGRATE_MEM_OBJECT_CONTENT_UNDEFINED, 0, NULL, NULL);

If I want to Share Buffer Between Devices of the Same Platform would the above be the correct and fastest away?

Extra:

Is it faster to use clEnqueueWriteBuffer() after clEnqueueMigrateMemObjects()?

Also, does clSetKernelArg() have any overhead when calling it?