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One of the killer features of Xen is the ability to contain qemu in a minimal stubdomain. But even though qemu-upstream has been supported by Xen for a long time, stubdomains are compatible only with the ancient qemu-traditional. There were multiple approaches to this problem discussed over time (rumprun, Linux, ...), including some PoC patches. In this presentation I'll explain why we've chosen the Linux solution in Qubes OS and what challenges we faced to make it really work.