Re: [PATCH] kvm: add EVER_MAPPED ioctl and capability

[Sean Christopherson]

On Fri, Jul 31, 2026, Florian Schmidt wrote:
> This allows a VMM to keep track of which pages were mapped by the guest
> at any point.

So does userfaultfd.  Any performance concerns with UFFD should be addressed by
KVM Userfault, which is on my todo list for this year.

[*] https://lore.kernel.org/all/20250109204929.1106563-1-jthoughton@xxxxxxxxxx