Support for amdgpu VM update via CPU on large-bar systems

[Kasiviswanathan, Harish]

Hi,

Please review the patch set that supports amdgpu VM update via CPU. This feature provides improved performance for compute (HSA) where mapping / unmapping is carried out (by Kernel) independent of command submissions (done directly by user space). This version doesn't support shadow copy of VM page tables for CPU based update.

Best Regards,
Harish

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