通过直通SR-IOV网络设备实现热迁移的管理程序方法

Xin Xu, Bhavesh Davda
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引用次数: 4

摘要

SR-IOV (single - root I/O Virtualization)是一种允许单个PCIe设备(物理功能或PF)作为多个PCIe设备(虚拟功能或VF)使用的规范。在虚拟化系统中,可以将每个VF以直通方式直接分配给虚拟机,从而大大提高网络性能。但是,VF直通模式与实时迁移不兼容,实时迁移是支持许多高级虚拟化特性(如高可用性和资源供应)的基本功能。为了解决这个问题,我们设计了SRVM,它提供了管理程序支持,以确保迁移的VM和应用程序可以正确使用VF设备。SRVM在虚拟机管理程序中实现,无需修改客户操作系统或客户虚拟机驱动程序。SRVM不会增加虚拟机停机时间。它只消耗有限的资源(仅在实时迁移预复制阶段额外的CPU核心),并且在VM网络性能方面没有明显的运行时开销。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Hypervisor Approach to Enable Live Migration with Passthrough SR-IOV Network Devices
Single-Root I/O Virtualization (SR-IOV) is a specification that allows a single PCI Express (PCIe) device (physical function or PF) to be used as multiple PCIe devices (virtual functions or VF). In a virtualization system, each VF can be directly assigned to a virtual machine (VM) in passthrough mode to significantly improve the network performance. However, VF passthrough mode is not compatible with live migration, which is an essential capability that enables many advanced virtualization features such as high availability and resource provisioning. To solve this problem, we design SRVM which provides hypervisor support to ensure the VF device can be correctly used by the migrated VM and the applications. SRVM is implemented in the hypervisor without modification in guest operating systems or guest VM drivers. SRVM does not increase VM downtime. It only costs limited resources (an extra CPU core only during the live migration pre-copy phase), and there is no significant runtime overhead in VM network performance.
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