2025

其他的解读

https://mp.weixin.qq.com/s/snl49e1T0nJ7PNAz2MrYHg https://mp.weixin.qq.com/s/kUq6MvRyyX1aeuSZlPSxgA https://mp.weixin.qq.com/s/tFkSmDOz7rwcVXgYb3yzFg https://mp.weixin.qq.com/s/V09xR2oPdDLuCKbNFpoFzA https://mp.weixin.qq.com/s/0YQTyw5BtCx5mGrezDFtbQ

所有的 slide

https://pretalx.com/kvm-forum-2025/schedule/

The next generation QEMU functional testing framework

https://pretalx.com/kvm-forum-2025/talk/KKAUKN/

QEMU had many test suites (unit tests, “qtests”, “iotests”, TCG-tests, …)

Missing end-to-end functional testing of VMs with real payloads (kernel, etc.)
Needed to write tests more easily. e.g. python + helpers for assets & caching
Maintainers from the Avocado project offered help in 2018
The Avocado-based functional test suite was introduced (initially called “acceptance” tests, later renamed to “avocado” tests)

(这里的第一个问题，为什么 Avocado 是需要的) https://github.com/avocado-framework/avocado 只有几百个 star

太细节了，不看了，有需要在看吧

Virtio 2025 state of the union

https://pretalx.com/kvm-forum-2025/talk/JQYA7Z/

QEMU Keynote

https://pretalx.com/kvm-forum-2025/talk/GDPJJP/

Bindings for QOM/qdev
Bindings for character devices
Bindings for logging
Initial work work on C<->Rust data structure interoperability

QEMU with VirtIO GPU Vulkan Support https://news.ycombinator.com/item?id=42392802

iphone 的支持: https://news.ycombinator.com/item?id=43592409 https://news.ycombinator.com/item?id=44258670

Introduction and KVM Keynote

很多都看不懂

arm 中的 PSCI hibernation 是什么?

Optimizations

TLB flush elision for Accessed bits
Batched TLB flushes (when turning off dirty page logging)
Aging PTEs without mmu_lock
Dynamic allocation of shadow MMU data structures AMD processor features:
Idle HLT
Separate enable_ipiv from posted interrupts

Single-binary: Unify QEMU system binaries per target architecture

为什么，因为有的平台中，一个系统有两个架构，也就是常说的异构:

Qualcomm Snapdragon X Elite ● CPU Oryon (aarch64) ● NPU Hexagon (hexagon)

AMD Zynq Ultrascale+ MP (qemu-system-aarch64 + qemu-system-microblaze) ● CPU Cortex A53 (aarch64) ● MCU Arm Cortex-R5F (arm) ● PMU (Platform Management Unit) Microblaze controller (microblaze)

jq –raw-output < build/compile_commands.json ‘.[].command’	grep -v
‘CONFIG_USER_ONLY’	grep -v tests/	grep -v qemu-keymap	grep -v linux-user
grep -v qemu-pr-helper	sed -e ‘s/.* //’ -e ‘s/”,//’	sort	uniq -c	sort
-rn	grep -v ‘^\s*1 ‘	less

没有完全理解，不过可以大概知道，这个工作就是编排代码，不然一个 machine 下只有一个架构的代码

The State of QEMU WebAssembly Port

https://pretalx.com/kvm-forum-2025/talk/EVRL9V/

效果不错啊: https://ktock.github.io/qemu-demo/busybox-arm.html

https://ktock.github.io/qemu-demo/alpine-x86_64.html

https://ktock.github.io/qemu-demo/raspi3ap.html

忽然想到，还可以把什么东西编译出来，放到 browser 中?

Emscripten (https://github.com/emscripten-core/emscripten)
- Emscripten: An LLVM-to-WebAssembly Compiler
TCI (TCG Interpreter)

基本实现原理: ● TCI is an IR interpreter. Other backends JIT translates the IR to the host arch

● QEMU v10.1 supports compilation of TCI (interpreter) to Wasm

我理解，就是从 tcg 可以被 tcg interpreter 解析，现在 qemu 可以支持将 TCI 构建为 Wasm ，所以相当于 tcg interpreter 可以在网页中运行。

(这个工作很有意思，例如存储，网络如何实现的)

类似的工作是 jslinux

Making io_uring pervasive in QEMU

https://vmsplice.net/~stefan/stefanha-kvm-forum-2025.pdf

没合并，
有点水，前面讲了太多关于 io uring 的实现

等 10.2 合并之后，看看如果现在的事件监听还是不是 io uring 吧

似乎想要添加一个操作为 : aio_add_sqe 来替代 aio_set_fd_handler 操作然后这么等待

while (busy_waiting) {
 …poll…
 if (io_uring_cq_ready(io_uring)) {
 break; /* go process CQEs */
 }
}

现在，如果真的可以用 iouring 作为 epoll ，不就是这种方法等待的吗?

From time to time : QEMU Time Control Redefined

https://pretalx.com/kvm-forum-2025/talk/NBJCSX/

主要考虑 tcg 问题

Exploring VM placement strategies for chiplet architectures

https://pretalx.com/kvm-forum-2025/talk/7EWDQN/

没有太理解，为什么不去直接在 linux kernel 中完成工作，而是通过分析 qemu 的行为，然后来绑定核心?

GiantVM: A Many-to-one Virtualization System Built Atop the QEMU/KVM Hypervisor

https://pretalx.com/kvm-forum-2025/talk/MDGYZG/

有趣，简直逆天

把多个机器合并为一个 vm

Shadow ioeventfd: Accelerating MMIO in vfio-user with Kernel-Assisted Dispatch

https://pretalx.com/kvm-forum-2025/talk/KTKTG9/

nutanix 在 vfio-user 上继续的工作

VFIO User - Using VFIO as the IPC Protocol in Multi-process QEMU - John Johnson & Jagannathan Raman

Upstreaming NVIDIA vGPU Support: Architecture, Implementation, and Roadmap

https://pretalx.com/kvm-forum-2025/talk/FNPW3D/

还没合并到主线

NVIDIA vGPU Support on Grace Blackwell Superchip: Architecture, Design, Upstreaming Status

https://pretalx.com/kvm-forum-2025/talk/XVV8JS/ https://github.com/zhiwang-nvidia/linux/tree/zhi/vgpu-rfc-v2

感觉没什么干活啊

Windows on Arm on QEMU/KVM: Challenges and Solutions

https://pretalx.com/kvm-forum-2025/talk/BDG7QR/

尝试把 windows arm iso 在 qemu 上启动起来

Improving Windows Hypervisor-Protected Code Integrity (HVCI) Performance on KVM

nutanix 的工作

https://pretalx.com/kvm-forum-2025/talk/JCPZNG/

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