[PATCH 0/2] memfd_luo: keep memfd frozen until finish

[Pratyush Yadav]

From: "Pratyush Yadav (Google)" <pratyush@xxxxxxxxxx>

Hi,

This series keeps a retrieved memfd frozen until finish. The main
motivation is to let dependents like iommufd have a chance to acquire a
reference. It also fits conceptually: finish is the point when the file
should be back to "normal".

Patch 1 allows keeping private_data from retrieve to finish. This is
needed by memfd to keep hold of folios_ser, which it uses to give up its
pins.

Patch 2 does the main change.

The series is based on
https://lore.kernel.org/kexec/20261103172251.2348370-1-pratyush@xxxxxxxxxx/T/#u.

Regards,
Pratyush Yadav

Pratyush Yadav (Google) (2):
  liveupdate: luo_file: allow keeping private_data from retrieve until
    finish
  mm/memfd_luo: keep memfd frozen until finish

 include/linux/liveupdate.h   |  8 ++--
 kernel/liveupdate/luo_file.c | 11 +++--
 mm/memfd_luo.c               | 87 ++++++++++++++++++++++++++++--------
 3 files changed, 81 insertions(+), 25 deletions(-)

-- 
2.56.0.385.gac671c819a-goog