With the Microsoft Hyper-V virtualization updates for the Linux 6.15 kernel there are two new features worth mentioning.
First and foremost, the Hyper-V updates for the mainline Linux 6.15 kernel bring support for running as the root partition in the Microsoft Hypervisor (Hyper-V) by exposing /dev/mshv. For more background information on that root partition support, see last year’s article Microsoft Continues Working On Hyper-V Dom0 Support For Linux.
The other new Hyper-V feature worth mentioning is support for CPU offlining in Hyper-V. Yes, until now it wasn’t possible to offline CPU cores under Hyper-V but now that ability is wired up. Offlining of CPU cores was previously not possible due to VMBUS channels attached to them while now the Hyper-V driver properly deals with the situation if wanting to take any CPU cores offline.
There are also various fixes and smaller improvements as part of the Linux 6.15 Hyper-V updates as noted within the pull request, which has already been merged to Linux Git.
