virtual wifi adapter in qemu
an idea by lnussel
Updated almost 6 years ago. 2 hacker ♥️. Has no hacker: grab it!

one of the top features a distribution must always ship in a working state is wireless. Yet we have no way to test it in an automated way. To be able to do that via openQA we need qemu to emulate a wireless adapter. Whether it's emulating existing hardware or implements some virtio device that only works on Linux doesn't matter.

No Hackers yet

Join this project

Looking for hackers with the skills:

qemu kernel

This project is part of:

Hack Week 10

Activity

  • about 11 years ago: michal-m liked this project.
  • about 12 years ago: a_faerber liked this project.
  • about 12 years ago: lnussel added keyword "kernel" to this project.
  • about 12 years ago: lnussel added keyword "qemu" to this project.
  • about 12 years ago: lnussel originated this project.


    • Comments

    • vbotka
      about 12 years ago by vbotka | Reply

      FYI. " wifi-test is fully automated test script for linux wireless drivers" available at http://wireless.kernel.org/en/developers/Testing/wifi-test . Some results of the tests can be found at http://users.suse.cz/~vbotka/wt/. Cisco AP, Dlink and ASUS AP with CLI (Command Line Interface). For example, Dlink DWL-8200 AP and Cisco1200 series AP is needed. HTH.

      -vlado

    • bmwiedemann
      about 12 years ago by bmwiedemann | Reply

      So emulating the wireless adapter alone is not sufficient - it also needs an access point (either physical or virtual) to receive the raw wireless 802.11* data and respond to association requests etc.

    • a_faerber
      about 12 years ago by a_faerber | Reply

      Some years ago an Austrian university tried to contribute Wifi emulation but threw a big blob at us, mixing random Windows hacks with the actual adapter/network emulation code, and didn't care to clean that up. Probably still available in qemu-devel archives as a starting point.

    • clownix
      almost 8 years ago by clownix | Reply

      Cloonix software can do wifi from version 42.03. It uses the mac80211_hwsim kernel module and an agent in the guests that transmits the signal from guest to host and to other guests.

    Similar Projects

    SUSE KVM Best Practices - Focus on SAP Workloads and Use Cases by roseswe

    Description

    SUSE Best Practices around KVM, especially for SAP workloads. Early Google presentation already made from various customer projects and SUSE sources.

    Goals

    • Complete presentation we can reuse in SUSE Consulting projects
    • 2025: Bring it to version 1.00 ready for customers

    Resources

    KVM (virt-manager) images

    SUSE/SAP/KVM Best Practices

    • https://documentation.suse.com/en-us/sles/15-SP6/single-html/SLES-virtualization/
    • SAP Note 1522993 - "Linux: SAP on SUSE KVM - Kernel-based Virtual Machine" && 2284516 - SAP HANA virtualized on SUSE Linux Enterprise hypervisors https://me.sap.com/notes/2284516
    • SUSECon24: [TUTORIAL-1253] Virtualizing SAP workloads with SUSE KVM || https://youtu.be/PTkpRVpX2PM
    • SUSE Best Practices for SAP HANA on KVM - https://documentation.suse.com/sbp/sap-15/html/SBP-SLES4SAP-HANAonKVM-SLES15SP4/index.html

    Q2Boot - A handy QEMU VM launcher by amanzini

    Description

    Q2Boot (Qemu Quick Boot) is a command-line tool that wraps QEMU to provide a streamlined experience for launching virtual machines. It automatically configures common settings like KVM acceleration, virtio drivers, and networking while allowing customization through both configuration files and command-line options.

    The project originally was a personal utility in D, now recently rewritten in idiomatic Go. It lives at repository https://github.com/ilmanzo/q2boot

    Goals

    Improve the project, testing with different scenarios , address issues and propose new features. It will benefit of some basic integration testing by providing small sample disk images.

    Updates

    • Dec 1, 2025 : refactor command line options, added structured logging. Released v0.0.2
    • Dec 2, 2025 : added external monitor via telnet option
    • Dec 4, 2025 : released v0.0.3 with architecture auto-detection
    • Dec 5, 2025 : filing new issues and general polishment. Designing E2E testing

    Resources

    Improve UML page fault handler by ptesarik

    Description

    Improve UML handling of segmentation faults in kernel mode. Although such page faults are generally caused by a kernel bug, it is annoying if they cause an infinite loop, or panic the kernel. More importantly, a robust implementation allows to write KUnit tests for various guard pages, preventing potential kernel self-protection regressions.

    Goals

    Convert the UML page fault handler to use oops_* helpers, go through a few review rounds and finally get my patch series merged in 6.14.

    Resources

    Wrong initial attempt: https://lore.kernel.org/lkml/20231215121431.680-1-petrtesarik@huaweicloud.com/T/

    Add Qualcomm Snapdragon 765G (SM7250) basic device tree to mainline linux kernel by pvorel

    Qualcomm Snapdragon 765G (SM7250) (smartphone SoC) has no support in the linux kernel, nor in u-boot. Try to add basic device tree support. The hardest part will be to create boot.img which will be accepted by phone.

    UART is available for smartphone :).

    early stage kdump support by mbrugger

    Project Description

    When we experience a early boot crash, we are not able to analyze the kernel dump, as user-space wasn't able to load the crash system. The idea is to make the crash system compiled into the host kernel (think of initramfs) so that we can create a kernel dump really early in the boot process.

    Goal for the Hackweeks

    1. Investigate if this is possible and the implications it would have (done in HW21)
    2. Hack up a PoC (done in HW22 and HW23)
    3. Prepare RFC series (giving it's only one week, we are entering wishful thinking territory here).

    update HW23

    • I was able to include the crash kernel into the kernel Image.
    • I'll need to find a way to load that from init/main.c:start_kernel() probably after kcsan_init()
    • I workaround for a smoke test was to hack kexec_file_load() systemcall which has two problems:
      1. My initramfs in the porduction kernel does not have a new enough kexec version, that's not a blocker but where the week ended
      2. As the crash kernel is part of init.data it will be already stale once I can call kexec_file_load() from user-space.

    The solution is probably to rewrite the POC so that the invocation can be done from init.text (that's my theory) but I'm not sure if I can reuse the kexec infrastructure in the kernel from there, which I rely on heavily.

    update HW24

    • Day1
      • rebased on v6.12 with no problems others then me breaking the config
      • setting up a new compilation and qemu/virtme env
      • getting desperate as nothing works that used to work
    • Day 2
      • getting to call the invocation of loading the early kernel from __init after kcsan_init()

    • Day 3

      • fix problem of memdup not being able to alloc so much memory... use 64K page sizes for now
      • code refactoring
      • I'm now able to load the crash kernel
      • When using virtme I can boot into the crash kernel, also it doesn't boot completely (major milestone!), crash in elfcorehdr_read_notes()

    • Day 4

      • crash systems crashes (no pun intended) in copy_old_mempage() link; will need to understand elfcorehdr...
      • call path vmcore_init() -> parse_crash_elf_headers() -> elfcorehdr_read() -> read_from_oldmem() -> copy_oldmem_page() -> copy_to_iter()

    • Day 5

      • hacking arch/arm64/kernel/crash_dump.c:copy_old_mempage() to see if crash system really starts. It does.
      • fun fact: retested with more reserved memory and with UEFI FW, host kernel crashes in init but directly starts the crash kernel, so it works (somehow) \o/

    update HW25

    • Day 1
      • rebased crash-kernel on v6.12.59 (for now), still crashing

    dynticks-testing: analyse perf / trace-cmd output and aggregate data by m.crivellari

    Description

    dynticks-testing is a project started years ago by Frederic Weisbecker. One of the feature is to check the actual configuration (isolcpus, irqaffinity etc etc) and give feedback on it.

    An important goal of this tool is to parse the output of trace-cmd / perf and provide more readable data, showing the duration of every events grouped by PID (showing also the CPU number, if the tasks has been migrated etc).

    An example of data captured on my laptop (incomplete!!):

              -0     [005] dN.2. 20310.270699: sched_wakeup:         WaylandProxy:46380 [120] CPU:005
          -0     [005] d..2. 20310.270702: sched_switch:         swapper/5:0 [120] R ==> WaylandProxy:46380 [120]
...
    WaylandProxy-46380 [004] d..2. 20310.295397: sched_switch:         WaylandProxy:46380 [120] S ==> swapper/4:0 [120]
          -0     [006] d..2. 20310.295397: sched_switch:         swapper/6:0 [120] R ==> firefox:46373 [120]
         firefox-46373 [006] d..2. 20310.295408: sched_switch:         firefox:46373 [120] S ==> swapper/6:0 [120]
          -0     [004] dN.2. 20310.295466: sched_wakeup:         WaylandProxy:46380 [120] CPU:004

    Output of noise_parse.py:

    Task: WaylandProxy Pid: 46380 cpus: {4, 5} (Migrated!!!)
        Wakeup Latency                                Nr:        24     Duration:          89
        Sched switch: kworker/12:2                    Nr:         1     Duration:           6

    My first contribution is around Nov. 2024!

    Goals

    • add more features (eg cpuset)
    • test / bugfix

    Resources

    Progresses

    isolcpus and cpusets implemented and merged in master: dynticks-testing.git commit

    Backporting patches using LLM by jankara

    Description

    Backporting Linux kernel fixes (either for CVE issues or as part of general git-fixes workflow) is boring and mostly mechanical work (dealing with changes in context, renamed variables, new helper functions etc.). The idea of this project is to explore usage of LLM for backporting Linux kernel commits to SUSE kernels using LLM.

    Goals

    • Create safe environment allowing LLM to run and backport patches without exposing the whole filesystem to it (for privacy and security reasons).
    • Write prompt that will guide LLM through the backporting process. Fine tune it based on experimental results.
    • Explore success rate of LLMs when backporting various patches.

    Resources

    • Docker
    • Gemini CLI

    Repository

    Current version of the container with some instructions for use are at: https://gitlab.suse.de/jankara/gemini-cli-backporter