Re: [PATCH v2 1/8] KVM: s390: vsie: Fix dat_split_ste()

[Janosch Frank]

On 3/20/26 17:15, Claudio Imbrenda wrote:
> If the guest misbehaves and puts the page tables for its nested guest
> inside the memory of the nested guest itself, the shadow mapping will
> lose synchronization with the actual mapping.

Maybe add this (or similar) instead of the sentence below:

This is due to the fact that we don't propagate the vsie bit from large 
STEs to all PTEs when splitting.

Let's copy that bit over just like the prefix bit.

> Propagate the vsie_notif bit from shadowed large pages to smaller pages
> when splitting a large page.

Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>