Nigel Douglas

Product Marketing Manager

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kubectl proxy’s Filter Gap and Your kubelet /run Attack Surface

October 28, 2026

kubectl proxy’s Filter Gap and Your kubelet /run Attack Surface

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Passing a TPU Through to a Paravirtualized Guest A customer asked us to run Google TPUs inside our zones. The obvious way to hand a guest a piece of PCI hardware is IOMMU-backed passthrough, and Xen has supported that for HVM guests for years. Our zones default to PV, without hardware virtualization extensions or a VT-x or AMD-V dependency. That is a big part of why they boot and fork as fast as they do. Moving these workloads to a different guest model would have meant giving up properties we deliberately built the runtime around, so the interesting problem was making passthrough work without changing the execution model. Xen's PV mode had never had an IOMMU story for a domU. Every DMA a PV guest issues goes out under dom0's address space, because PV was designed before device passthrough to an unprivileged domain was something anyone needed from it. The TPU work ended up being three problems stacked on top of each other. We had to give Xen an IOMMU interface a PV guest could actually

October 27, 2026

Passing a TPU Through to a Paravirtualized Guest

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It's Beginning to Look a Lot Like CVE Season: PHP2Shell and Beyond

October 23, 2026

It's Beginning to Look a Lot Like CVE Season: PHP2Shell and Beyond

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Sovereign AI: How Workload Identity Solves Data Sovereignty Challenges

May 6, 2025

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Mind the Gap: How Edera Accelerates Confidential Computing

May 1, 2025

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When "Virtual" Doesn't Mean "Secure": The False Promise of Namespace-Based Isolation

April 24, 2025

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Spring Cleaning: What Community Gardening Has Taught Me About Open Source Maintainership

April 23, 2025

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Introducing Styrolite: Building a Linux Container Runtime from Scratch

March 26, 2025

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Announcing Edera for Containers 1.0 Now Generally Available

March 26, 2025

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Defining Container Isolation for the Multi-Tenant Cloud Era

March 13, 2025

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