nvproxy: support DMA-BUF export for GPU memory#13101
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nvproxy: support DMA-BUF export for GPU memory#13101atoniolo76 wants to merge 1 commit intogoogle:masterfrom
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Add NV_ESC_EXPORT_TO_DMABUF_FD ioctl handling to export GPU memory as DMA-BUF file descriptors that ibv_reg_dmabuf_mr can consume. This is the prerequisite for GPU-direct RDMA via the RDMA proxy. Key changes: - Add HostFDProvider interface in pkg/sentry/vfs for cross-device FD translation (used by rdmaproxy to resolve sandbox FD -> host FD) - Add IoctlExportToDMABufFD struct in pkg/abi/nvgpu - Implement frontendExportToDMABufFD, ctrlExportObjectToFD, and ctrlExportObjectsToFD handlers - Add hostFDWrapper type for wrapping host DMA-BUF FDs in the sentry - Fix RawSyscall -> Syscall in UVM ioctl paths for preemption safety Co-authored-by: Cursor <cursoragent@cursor.com>
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Add NV_ESC_EXPORT_TO_DMABUF_FD ioctl handling to export GPU memory as DMA-BUF file descriptors that ibv_reg_dmabuf_mr can consume. This is the prerequisite for GPU-direct RDMA via the RDMA proxy.
Key changes: