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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Why GPUs Are the Weak Link in AI Security

September 30, 2025

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GPU Runtime Security: Why AI Clouds Are Flying Blind

September 23, 2025

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Finding Xen in the Chaos: Edera's Isolation Makes Chaotic Deputy Irrelevant

September 19, 2025

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What Is A Zone? Secure Container Isolation with Edera

September 18, 2025

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Runtime Security Beyond Hardened Containers

September 16, 2025

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What Is Paravirtualization?

September 11, 2025

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Edera and Confidential Computing: Stronger Together

September 9, 2025

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