Re: [PATCH man-pages v1 0/6] userfaultfd: document read-write protect mode

[Alejandro Colomar <alx@kernel.org>]

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Hi Mike,

On 2026-05-26T12:30:58+0300, Mike Rapoport wrote:
> On Mon, May 25, 2026 at 01:28:10PM +0100, Kiryl Shutsemau wrote:
> > This series documents userfaultfd read-write protection tracking
> > (UFFDIO_REGISTER_MODE_RWP), a working-set tracking mechanism for VM
> > guest memory landing in Linux 7.2.
> > 
> > The matching kernel series ("userfaultfd: working set tracking for VM
> > guest memory") was sent against the mm tree:
> > https://lore.kernel.org/all/20260525113737.1942478-1-kas@kernel.org/
> 
> The content of the docs looks fine to me.
> 
> Leaving groff and organization to Alex :)
> 
> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

Thanks!  :)


Have a lovely day!
Alex

> 
> > == New UAPI documented ==
> > 
> >   UFFDIO_REGISTER_MODE_RWP    registration-mode bit (UFFDIO_REGISTER.2const)
> >   UFFD_FEATURE_RWP            capability bit          (UFFDIO_API.2const)
> >   UFFD_FEATURE_RWP_ASYNC      async resolution        (UFFDIO_API.2const)
> >   UFFDIO_RWPROTECT            install/remove RWP      (new page)
> >   UFFDIO_SET_MODE             runtime mode toggle     (new page)
> >   UFFD_PAGEFAULT_FLAG_RWP     new pagefault.flags bit (userfaultfd.2)
> >   PAGE_IS_ACCESSED            PAGEMAP_SCAN bit        (kernel docs only)
> > 
> > == Series layout ==
> > 
> >   1. userfaultfd.2: overview, registration mode entry, new pagefault
> >      flag, VERSIONS line, and an "Userfaultfd read-write protect mode"
> >      section.
> >   2-3. New UFFDIO_RWPROTECT.2const and UFFDIO_SET_MODE.2const pages.
> >   4. UFFDIO_API.2const: UFFD_FEATURE_RWP, UFFD_FEATURE_RWP_ASYNC,
> >      and 1 << _UFFDIO_SET_MODE.
> >   5. UFFDIO_REGISTER.2const: UFFDIO_REGISTER_MODE_RWP and
> >      1 << _UFFDIO_RWPROTECT.
> >   6. ioctl_userfaultfd.2: reference the two new ioctls.
> > 
> > Order: new pages first so the cross-references in patches 4-6 link
> > to pages that already exist.
> > 
> > Kiryl Shutsemau (5):
> >   UFFDIO_RWPROTECT.2const: New page
> >   UFFDIO_SET_MODE.2const: New page
> >   UFFDIO_API.2const: Document UFFD_FEATURE_RWP{,_ASYNC} and 1 <<
> >     _UFFDIO_SET_MODE
> >   UFFDIO_REGISTER.2const: Document UFFDIO_REGISTER_MODE_RWP and 1 <<
> >     _UFFDIO_RWPROTECT
> >   ioctl_userfaultfd.2: Reference UFFDIO_RWPROTECT and UFFDIO_SET_MODE
> > 
> > Kiryl Shutsemau (Meta) (1):
> >   userfaultfd.2: Add read-write protect mode
> > 
> >  man/man2/ioctl_userfaultfd.2          |   4 +
> >  man/man2/userfaultfd.2                | 152 +++++++++++++++++++++++++-
> >  man/man2const/UFFDIO_API.2const       |  29 +++++
> >  man/man2const/UFFDIO_REGISTER.2const  |  21 ++++
> >  man/man2const/UFFDIO_RWPROTECT.2const | 117 ++++++++++++++++++++
> >  man/man2const/UFFDIO_SET_MODE.2const  |  95 ++++++++++++++++
> >  6 files changed, 414 insertions(+), 4 deletions(-)
> >  create mode 100644 man/man2const/UFFDIO_RWPROTECT.2const
> >  create mode 100644 man/man2const/UFFDIO_SET_MODE.2const
> > 
> > 
> > base-commit: 9a4bfd0e50745c2649b6291db40b58e37c9c1c6b
> > -- 
> > 2.54.0
> > 
> 
> -- 
> Sincerely yours,
> Mike.

-- 
<https://www.alejandro-colomar.es>

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