More ways to boot, with less overhead – just what's needed in the embedded market
Version 4.17 of the Xen project's eponymous hypervisor has debuted, bringing with it the first look at Hyperlaunch capabilities that allow the creation of multipole VMs on startup.– a privileged domain that has to run before the DomU unprivileged domains that contain virtual machines can get to work.
In 2018, Xen developers started work to change that – in part because Dom0 takes a while to get going on small devices, leading some developers to look at alternative hypervisors. Makers of small devices like virtualization because the isolation it affords improves the security of their machines. In fields like automotive, hypervisors are also appreciated as they allow manufacturers to reduce the number of devices in a vehicle. If one computer can offer sufficient power, and the isolation required to stop an entertainment system interfering with self-driving software, the weight and cost of cars goes down.
Hyperlaunch makes that sort of scenario possible by allowing the definition of VM fleets that boot when a computer powers up. You can even pin hardware resources to different VMs. Hyperlaunch gets Xen closer to the functionality of some niche hypervisors and makes it friendlier to unikernels. It also allows developers to choose different modes of operation: it's possible to work much as Dom0 does today, or to configure systems to boot multiple VMs all at once with known privileges and resources, or to boot and let VMs hunt for resources their images may not have pre-defined.
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