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0e1f616
(Get the code!)
Are you using Libvirt? If so, you can just remove xsaves in the Libvirt XML ("<feature policy='disable' name='xsaves'/>">).
It seems to me that this is a Hyper-V bug, but I understand that this is not a configuration that happens on real hardware.
Adding the flag to all Skylake and newer systems (including Denverton and Snowridge) is the best choice, but we cannot just add it; if you want to send a patch, see the "Intel Atom Processor (SnowRidge)" model for an example of how to do it.