At Microsoft, we are working on a project called openHCL, which is a Linux-based paravisor featuring a user-mode virtualization stack.
For more details, you can check out this micro conference: LPC Event.
The paravisor is upgraded using a servicing operation where the old paravisor is shutdown and the new paravisor is booted into. Our goal...
PCIe 6.0 introduced device authentication and encryption (sec 6.31 and 6.33). We are bringing up kernel support, seeking consensus with the community at past Plumbers installments ([2023][1], [2022][2], [2021][3]).
We would like to continue this fine tradition by presenting our progress since last year's Plumbers and having an open discussion on the next steps towards mainline.
An...
This BoF will be an opportunity to discuss Linux kernel debugging tools, with a primary focus on Drgn. Discussion will be attendee-driven, some example discussion topics could be:
- Ready-made examples of using drgn to debug a vmcore or live kernel built with virtme-ng.
- Discussion on writing good drgn...
The COCONUT-SVSM community wants to get in contact with the wider Linux and virtualisation community and gather ideas, discuss problems and get input for the next year of development.
Therefore we invite everyone interested in Confidential Computing and the SVSM to join us in this BoF.
There are several efforts to support memory persistence over kexec:
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PKRAM [1]: Tmpfs-style filesystem which dynamically allocates memory which can be used for guest RAM and is preserved across kexec by passing a pointer to the root page.
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Kexec Hand Over (KHO) [2]: This is a generic mechanism to pass kernel state across kexec. It also supports specifying persisted memory page which...
Birds of Feather session around Devicetree in Linux kernel. Few topics from the top of my head:
1. Devicetree and firmware-abstracted hardware. Fore example consider some resources like clocks and regulators hidden behind SCMI interface. See also: https://lore.kernel.org/all/be31801e-bb21-426b-f7aa-2b52727de646@quicinc.com/
2. Devicetree bindings for virtual systems and their devices.
3....
As of today, the vast majority of accelerators for machine learning (NPUs, TPUs, DLAs, etc) lack a presence in the mainline kernel.
These accelerators can be used only with out-of-tree kernel drivers and binary-only userspace stacks, often forks of one or more open-source machine-learning frameworks. Companies are prey to vendor lock-in.
Companies selling accelerators are starting to...
Integer overflows are a constant source of security problems. Someone needs to do something about it. We'll discuss new approaches using static analysis and runtime sanitizers. These approaches will require creating new rules for writing safe code. Most integer overflows are "harmless". For example, we used to have repeated security issues related to passing negative sizes to...
The userspace which has a complex logic to manage the thermal envelope of the platform is often platform specific because custom kernels export clumsily interfaces to act on PM. Therefore, the userspace is often unusable when we want to support mainline kernels. That leads to more work as there are multiple userspace implementation to achieve the same goal. The objective of the discussion /...
We frequently are asked to triage and resolve "cgroup" bugs - from both
internal customers and Oracle Linux users. Cgroups are intertwined throughout
the entire kernel, and so users are often interacting with cgroups when they
encounter an issue. But rarely do the problems end up being a cgroup issue.
This has been a significant time sink for us.
To combat this, we've developed an...
The RISC-V MC is limited to 1.5-3h, so we'll definitely spill over.
This BoF will discuss:
* maintainership
* testing/CI on QEMU
* testing/CI on HW
The Linux kernel has numerous tools to detect bugs, among them a family of dynamic program analysis called "sanitizers": Kernel Address Sanitizer (KASAN), Kernel Memory Sanitizer (KMSAN), Kernel Concurrency Sanitizer (KCSAN), and the Undefined Behaviour Sanitizer (UBSAN).
Knowing when to apply which sanitizer in the kernel development process may not always be obvious: each sanitizer is...
This is the traditional RCU Q&A session. If there are no questions, topics to be covered include explanation of the array of RCU flavors, recent changes in RCU, polling RCU APIs, expediting RCU callbacks, and possible improvements in the intersection between RCU and MM reclaim.
[Syzbot][1] is a continuous kernel fuzzing system which automatically uncovers and reports hundreds of Linux kernel findings each quarter.
The session aims to foster open dialogue between the kernel engineers and those who operate syzbot. We'll discuss what's working well, where attention is needed, and how we can improve.
We plan to start by highlighting the key changes over the past...
The KernelCI community is quite lively lately, so we want to take the opportunity to bring everyone interested in kernel testing together in the same room to discuss key priorities for the community. We invite kernel maintainers and developers, product developers, CI systems developers and different projects caring about testing, regression tracking and integration of the kernel.
How to...
bpftrace is a hugely popular dynamic tracing technology for the Linux platform (https://github.com/bpftrace/bpftrace) leveraging eBPF. Its simple yet powerful scripting language, BpfScript, provides the ability to gain a new and fresh understanding of the entire software stack, from high level application APIs to the bowels of the kernel. Analyzing...
The Android MC Birds of a Feather allows space to further discuss important topics from the Android MC, and to also discuss some overflow topics that could not fit in the Android MC schedule.