[CentOS] workaround using CentOS Plus Kernel? -- for 7.4 does not support PV [Xen]

Relates to: https://prgmr.com/blog/2017/09/14/centos-7-pv-unsupported.html

I'm considering switching to the **CentOS Plus Kernel**.  What are the downsides?
In the link above,  will the CentOS Plus Kernel get upgraded or will it be locked
at a specific kernel?

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thanks!,
Tom
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https://wiki.centos.org/AdditionalResources/Repositories/CentOSPlus