Stefan Hajnoczi

My KVM Forum 2025 talk "Making io_uring Pervasive in QEMU" is now available on YouTube . The slides are also available here (PDF) ...

A fair amount of the development work I do is related to storage performance in QEMU/KVM. Although I have written about disk I/O benchmarkin...

My KVM Forum 2024 talk "IOThread Virtqueue Mapping: Improving virtio-blk SMP scalability in QEMU" is now available on YouTube . Th...

Every once in a while a bug comes along where a guest hangs while communicating with a QEMU VIRTIO device. In this blog post I'll share ...

At FOSDEM '23 I gave a talk about vhost-user-blk and its use as a userspace block I/O interface. The video and slides are now available ...

vhost-user-blk has connected hypervisors to software-defined storage since around 2017, but it was mainly seen as virtualization technology....

At KVM Forum 2022 Kevin Wolf and Stefano Garzarella gave a talk on qemu-storage-daemon, a way to get QEMU's storage functionality withou...

vhost-user-blk is a high-performance storage protocol that connects virtual machines to software-defined storage like SPDK or qemu-storage-...

There is a new project called passt that Stefano Brivio has been working on to implement usermode networking, the magic that ...

The PDF slides for my "Bring Your Own Virtual Devices: Frameworks for Software and Hardware Device Virtualization" talk from the ...

When given the choice between communicating in private or in public, many people opt for private communication. They send questions or unfi...

Over the past months I have participated in discussions about out-of-process device emulation. This post describes the requirements that hav...

The recent development of a Linux driver framework called VIRTIO Data Path Acceleration (vDPA) has laid the groundwork for exciting...

This post explains event loops in QEMU v5.1.0 and their unique features compared to other event loop implementations. The APIs are n...

As 2011 comes to an end I want to look back at the highlights from the QEMU community this year. Development progress feels good, the maili...

I visited the Computer History Museum in Mountain View, CA when attending Google Summer of Code Mentor Summit 2011. The museum is fantasti...

QEMU now has greatly enhanced VMDK VMware disk image file support, thanks to Fam Zheng's hard work during Google Summer of Code 2011. P...

It's pretty common to need to copy files between a virtual machine and the host. This can be drivers or installers from the host into t...

This post explains how vhost provides in-kernel virtio devices for KVM. I have been hacking on vhost-scsi and have answered questions about...

I had the opportunity to attended LinuxCon Japan 2011 in Yokohama. The conference ran many interesting talks, with a virtualization mini-su...