On Wed, 2025-06-11 at 07:42 -0700, Sean Christopherson wrote: > If there's a *legitimate* use case where the guest wants to ACCEPT a subset of > memory, then there should be an explicit TDCALL to request that the unwanted > regions of memory be unmapped. Smushing everything into implicit behavior has > obvioulsy created a giant mess. Hi, still digging on if there is any possible use. I think this may need a guest opt-in, so the guest can say it can handle errors for both smaller and larger page size matches. So it may not matter if there is a rare usage or not. If KVM finds the guest opts-in (how to do that TBD), it can start mapping at the host level. If KVM doesn't see the opt-in, the guest gets 4k pages.
