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UCT/CUDA/CUDA_IPC: Set context associated with local buffer - v1.19.x #10697

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UCT/CUDA/CUDA_IPC: Set context associated with local buffer - v1.19.x #10697

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What?

Set context associated with local buffer before performing RMA operation in cuda_ipc transport

Why?

Fix the following scenario:

  1. Allocate data using CUDA VMM API, setting access to CUDA device X.
  2. Set CUDA device Y.
  3. Unpack remote key.
  4. Perform UCP RMA operation.
  5. cuda_ipc::[get|put]_zcopy fails to perform cuMemcpyDtoDAsync.

The issue was found using #10670.

How?

Cherry-pick #10671

@rakhmets rakhmets requested a review from brminich May 23, 2025 13:38
@rakhmets rakhmets requested a review from yosefe May 27, 2025 15:07
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@brminich brminich brminich approved these changes

@yosefe yosefe Awaiting requested review from yosefe

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@rakhmets @brminich