On Thu, 11 Apr 2024 18:14:39 +0200 David Hildenbrand <david@xxxxxxxxxx> wrote: > This series fixes one issue with uffd + shared zeropages on s390x and > fixes that "ordinary" KVM guests can make use of shared zeropages again. > > ... > > Without the shared zeropage, during (2), the VM would suddenly consume > 100 GiB on the migration source and destination. On the migration source, > where we don't excpect memory overcommit, we could easilt end up crashing > the VM during migration. > > Independent of that, memory handed back to the hypervisor using "free page > reporting" would end up consuming actual memory after the migration on the > destination, not getting freed up until reused+freed again. > Is a backport desirable? If so, the [1/2] Fixes dates back to 2015 and the [2/2] Fixes is from 2017. Is it appropriate that the patches be backported so far back, and into different kernel versions?
