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 [1]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 [2]the pull request , which has already been merged to Linux Git.



[1] https://www.phoronix.com/news/Microsoft-Hyper-V-Dom0-Linux

[2] https://lore.kernel.org/lkml/Z-GYKSuytHh-Weas@liuwe-devbox-ubuntu-v2.lamzopl0uupeniq2etz1fddiyg.xx.internal.cloudapp.net/