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Thursday, October 29 • 07:00 - 07:30
A Virtual IOMMU With Cooperative DMA Buffer Tracking - Yu Zhang, Intel

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Direct assignment of I/O devices requires the host to statically pin the entire guest memory, thus hindering the efficiency of memory management. Presenting a vIOMMU can fix this but suffers from non-negligible cost of emulating the guest DMA remapping operations. Yu proposes a new vIOMMU architecture with a cooperative DMA buffer tracking mechanism, which is dedicated to achieving fine-grained pinning and is orthogonal to the costly DMA remapping interface. The new mechanism minimizes the VM-exits when enabling host/guest to coordinate the mapping/pinning requirement of active DMA buffers. It is designed in a vendor-agnostic way, thus can be applied to either emulated or para-virtualized vIOMMUs, Paper of this idea was accepted by USENIX ATC’20. In this talk, Yu'd like to talk more about the design/implementation challenges in KVM/Qemu, current status and upstreaming plan.

Speakers
YZ

Yu Zhang

Virtualization Developer, Intel Corporation
Yu is a virtualization developer from Intel's virtualization team. He had 10+ years’ experiences in virtualization areas from I/O to CPU/memory virtualization, from performance tuning to security enhancements. Yu’s public presentation experience includes Xen summit/LC3 conference/Intel... Read More →



Thursday October 29, 2020 07:00 - 07:30 GMT
KVM Theater
  KVM Track 2