Operating Systems

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New submissions for Tue, 4 Jun 24

[1]  arXiv:2406.01225 [pdf, other]

Title: SVFF: An Automated Framework for SR-IOV Virtual Function Management in FPGA Accelerated Virtualized Environments

Authors: Stefano Cirici, Michele Paolino, Daniel Raho

Subjects: Operating Systems (cs.OS)

FPGA accelerator devices have emerged as a powerful platform for implementing high-performance and scalable solutions in a wide range of industries, leveraging their reconfigurability and virtualization capabilities. Virtualization, in particular, offers several benefits including improved security by resource isolation and sharing, and SR-IOV is the main solution for enabling it on FPGAs.
This paper introduces the SR-IOV Virtual Function Framework (SVFF), a solution that aims to simplify and enhance the management of Virtual Functions (VFs) on PCIe-attached FPGA devices in Linux and QEMU/KVM environments, solving the lack of SR-IOV re-configuration support on guests. The framework leverages the SR-IOV support in the Xilinx Queue-based Direct Memory Access (QDMA) to automate the creation, attachment, detachment, and reconfiguration of VFs to different Virtual Machines (VMs). A novel pause functionality for the VFIO device has been implemented in QEMU to enable the detachment of VFs from the host without detaching them from the guest, making reconfiguration of VFs transparent for guests that already have a VF attached to them without any performance loss. The proposed solution offers the ability to automatically and seamlessly assign a set of VFs to different VMs and adjust the configuration on the fly. Thanks to the pause functionality, it also offers the ability to attach additional VFs to new VMs without affecting devices already attached to other VMs.

Cross-lists for Tue, 4 Jun 24

[2]  arXiv:2406.01339 (cross-list from cs.HC) [pdf, other]

Title: Recover as It is Designed to Be: Recovering from Compatibility Mobile App Crashes by Reusing User Flows

Authors: Donghwi Kim, Hyungjun Yoon, Chang Min Park, Sujin Han, Youngjin Kwon, Steven Y. Ko, Sung-Ju Lee

Subjects: Human-Computer Interaction (cs.HC); Operating Systems (cs.OS); Software Engineering (cs.SE)

Android OS is severely fragmented by API updates and device vendors' OS customization, creating a market condition where vastly different OS versions coexist. This gives rise to compatibility crash problems where Android apps crash on certain Android versions but not on others. Although well-known, this problem is extremely challenging for app developers to overcome due to the sheer number of Android versions in the market that must be tested. We present RecoFlow, a framework for enabling app developers to automatically recover an app from a crash by programming user flows with our API and visual tools. RecoFlow tracks app feature usage with the user flows on user devices and recovers an app from a crash by replaying UI actions of the app feature disrupted by the crash. To prevent recurring compatibility crashes, RecoFlow executes a previously crashed app in compatibility mode that is enabled by our novel Android OS virtualization technique. Our evaluation with professional Android developers shows that our API and tools are easy to use and effective in recovering from compatibility crashes.

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