Re: [PATCH v2 2/3] userfaultfd: UFFDIO_REMAP uABI

On Wed, Sep 27, 2023 at 11:25:22AM -0700, Suren Baghdasaryan wrote:

For uffd_remap can_change_pte_writable() would fail it VM_WRITE is not set, but we want remapping to work for RO memory as well.

Is there an use case that we want remap to work on RO?

The thing is, either removing a page or installing a new one with valid content imply VM_WRITE to me on either side..

Thanks,