David Crawshaw on Mythryl: “This is well-known to those who have been running VMs for a while…”

This is well-known to those who have been running VMs for a while but is not easily learned if you're new to the space, so we figured it should have a blog post. We have also exposed control over kernel scheduling cookies in a way we believe is novel.

exe@exe.dev

Sharing a CPU core comes with a security tradeoff. At exe, your team’s VMs can share cores with each other. Other teams’ VMs stay separate. And if your own VMs need that separation too, your team admin can turn sharing off. Ian explains how it works: blog.exe.dev/crossing-the...

blog.exe.devCrossing the Hyper-Thread Boundary - exe.dev blogYour VMs can share a CPU core. You get to decide who they share it with.

7/10/26, 5:15 pm1 repost15 likes

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