[Kern Meetup Blr] [CFP: Linux Kernel Meetup ((06th Dec 2025) at Bangalore] : Userspace device IO using VFIO framework

[Shivaprasad bhat]

Hi All,

Here is my synopsis :-

Topic: Userspace device IO using VFIO framework

Abstract:

VFIO is a kernel framework to interact with devices from the userspace. 

Currently this forms the basis of how Qemu supports PCI passthrough 

of Host devices to a Guest. This can also be leveraged to create userspace

drivers for IO devices with minimal kernel intervention.

This talk focuses on how the userspace interacts with the VFIO subsystem

and how VFIO interacts with other subsystems in the kernel. Additionally, we

will also go through the existing implementations of userspace drivers that

use VFIO to interact with an IO device.

Will also talk about the future directions on how new frameworks like

iommufd are improving upon the functionality provided by the VFIO.

Outline:

VFIO Introduction, history

How VFIO interacts with IOMMU 

Userspace APIs for device access

Userspace view of the device

How Qemu exploits VFIO for guest passthrough

Limitations and Future directions

Preferred Format: 25+5 mins

Bio: Linux kernel enthusiast focussing on the VFIO and device passthrough on POWER servers for the last few years, also have been contributing to SCM, qemu, libvirt and KVM.

Regards,

Shivaprasad

[Bhagyashri Pathak]

+1

Regards,
Bhagyashri  Pathak

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[AKHILESH PATIL]

+1

On 25-Nov-2025, at 4:24 PM, Bhagyashri Pathak <pathak...@gmail.com> wrote:



To view this discussion, visit https://groups.google.com/d/msgid/kernel-meetup-bangalore/CA%2Bb%3DmBwt_GEobkxX_C8fwwGuRRtmxKgpnJrxCZVaDX4LeTCJNg%40mail.gmail.com.

[Aditya Gupta]

+1

On 25/11/25 16:15, Shivaprasad bhat wrote:
> Hi All,
>
> Here is my synopsis :-
>
> Topic: Userspace device IO using VFIO framework
>

> ...

[Nilay Shroff]

+1

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[Rahul Kumar]

+1

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[Avi Roy]

+1

[Vishal C]

+1

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[Sumit Gupta]

+1

> To view this discussion, visit https://groups.google.com/d/msgid/kernel-meetup-bangalore/CADMOb%2BtsuXBof-CTAifYqSVq%2BmgUSyfjzU0_uQWeUp1a5VipFQ%40mail.gmail.com.



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Thanks & Regards,
Sumit Gupta
Mob: +91-9717222038

[Shivaprasad bhat]

Hi All,

As the time for the talk is reduced to 10+5 mins, I will shorten the topics to be covered here.

The original agenda was, 

VFIO Introduction, history

Userspace view of the device

How VFIO interacts with IOMMU

Userspace APIs for device access

How Qemu exploits VFIO for guest passthrough

Limitations and Future directions

I will be covering the 3-3.5 topics to fit in the time. Please reach out to me if

any one wants other topics also to be covered. I will try to shuffle the rest of the

topics to fit in the time accordingly.

Thanks,

Shivaprasad