Hi,
 
> It's a bit more complicated than setting it at build time, but we can
> always ask Xen how many vcpu we have and set the PCD accordingly. This
> is something that can happen in OvmfPkg/XenPlatformPei module.

Exactly.

> But to be honest, I don't know if it's worth it, because I don't know the
> downside of having a higher value for PcdCpuMaxLogicalProcessorNumber.

Well, the downside is that you have to keep ovmf and xen in sync
manually.  Your call.  If you prefer to do it that way I have no
objections, just wanted point out the alternative approach.

take care,
  Gerd



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