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Emulating Hyper-V in 2022 - Vitaly Kuznetsov, Red Hat

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Emulating Hyper-V in 2022 - Vitaly Kuznetsov, Red Hat
KVM is able to pretend being Microsoft Hypervisor (Hyper-V) for a long time but it never implemented the full set of features. There are two concurrent processes: more features get implemented in KVM and new Hyper-V versions are developed by Microsoft which usually bring new PV mechanisms. How are we doing in 2022? What's new in Hyper-V emulation and what's currently missing? How KVM and Hyper-V collaborate in nested scenarios? Can some of these features come handy for other KVM deployments when Windows is not in the picture?
KVM is able to pretend being Microsoft Hypervisor (Hyper-V) for a long time but it never implemented the full set of features. There are two concurrent processes: more features get implemented in KVM and new Hyper-V versions are developed by Microsoft which usually bring new PV mechanisms. How are we doing in 2022? What's new in Hyper-V emulation and what's currently missing? How KVM and Hyper-V collaborate in nested scenarios? Can some of these features come handy for other KVM deployments when Windows is not in the picture?