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Thursday, October 29 • 06:30 - 07:00
AMD-vIOMMU: A Hardware-assisted Virtual IOMMU Technology - Suravee Suthikulpanit & Wei Huang, AMD

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There have been various usages of IOMMU in virtual machines (VMs), especially for supporting pass-through devices within a VM. Several virtual IOMMU (vIOMMU) solutions have been proposed and implemented, which are mostly done in an emulated fashion. This talk will focus on the technical details of a new hardware-assisted vIOMMU technology introduced in the AMD second-generation EPYC platforms. The goal of this technology is to improve the performance of vIOMMU for pass-through devices. We will discuss how the support is implemented in AMD IOMMU driver for when it is running in the host, as well as how it is being modified to use the v2 I/O page table for DMA-API when running in the guest. As a proof of concept, QEMU is modified to leverage the vIOMMU hardware via a new ioctl interface. This presentation will cover the implementation details and performance results of our initial design.

Speakers
WH

Wei Huang

Open-Source Contributor, AMD
Wei Huang is a member of AMD Server Software Group, with current focus on server OS and x86 virtualization. Wei has contributed to Linux kernel and various open source virtualization projects (Xen, KVM/QEMU, etc.), and presented a number of times at various technical conferences... Read More →
avatar for Suravee Suthikulpanit

Suravee Suthikulpanit

Linux Contributor, Open-Source Contributor, AMD
Suravee Suthikulpanit works for AMD Server Software Group. His work mainly focus on Linux kernel and the open-source virtualization software. Within AMD, Suravee works with the hardware design and performance teams on future feature definitions. Suravee has been a regular contributor... Read More →



Thursday October 29, 2020 06:30 - 07:00 GMT
KVM Theater
  KVM Track 1