Securely Exposing GPUs to Multi-Tenant Hosts in a RISC-V + NVLink World

Securely Exposing GPUs to Multi
e28094Tenant Hosts in a RISC-V + NVLink Fusion World

Hook: You need to host GPU workloads for multiple tenants without unexpected noisy neighbors, DMA escapes, or billing surprises
e28094 but NVLink Fusion and new RISC-V host designs are blurring the hardware boundaries you used to rely on. This guide shows you how to design secure, predictable multi
e28094tenant GPU hosting in 2026 using practical tools and configurations you can deploy today.

Top takeaways (read first)

• Never expose raw GPU PCIe resources to tenants without DMA remapping (IOMMU) and verified isolation.
• Prefer mediated devices (mdev) or vendor hardware partitions (MIG/vGPU) over full VFIO passthrough for most multi
  e28094tenant scenarios.
• Treat NVLink Fusion as a fabric that changes locality
  e28094 enforce fabric partitioning and topology
  e28094aware scheduling.
• On RISC-V hosts, validate IOMMU/firmware support and vendor drivers before production rollouts.
• Integrate scheduler extensions, telemetry (DCGM/DCGM Exporter), and continuous attack surface testing into CI/CD.

The 2026 context: why this matters now

Late
e280942025 and early
e280942026 developments accelerated heterogenous compute adoption. Major announcements
e28094 such as SiFive integrating Nvidia's NVLink Fusion with RISC-V IP
e28094 mean RISC-V hosts will soon natively attach to high
e28094speed GPU fabrics. NVLink Fusion (and similar fabrics) blur PCIe locality: GPUs can present pooled memory and peer
e28094to
e28094peer NUMA across enclaves, and that changes how we think about isolation, DMA, and scheduling.

For operators and platform engineers, two realities follow:

1. Hardware boundaries are now software policy surfaces. What used to be