The new /dev/userfaultfd handle is superior to the system call with a better permission control and also works for a restricted seccomp environment.
The new device was only introduced in v6.1 so we need a header update. Please have a look, thanks. Peter Xu (3): linux-headers: Update to v6.1 util/userfaultfd: Add uffd_open() util/userfaultfd: Support /dev/userfaultfd include/qemu/userfaultfd.h | 1 + include/standard-headers/drm/drm_fourcc.h | 34 ++++- include/standard-headers/linux/ethtool.h | 63 +++++++- include/standard-headers/linux/fuse.h | 6 +- .../linux/input-event-codes.h | 1 + include/standard-headers/linux/virtio_blk.h | 19 +++ linux-headers/asm-generic/hugetlb_encode.h | 26 ++-- linux-headers/asm-generic/mman-common.h | 2 + linux-headers/asm-mips/mman.h | 2 + linux-headers/asm-riscv/kvm.h | 4 + linux-headers/linux/kvm.h | 1 + linux-headers/linux/psci.h | 14 ++ linux-headers/linux/userfaultfd.h | 4 + linux-headers/linux/vfio.h | 142 ++++++++++++++++++ migration/postcopy-ram.c | 11 +- tests/qtest/migration-test.c | 3 +- util/trace-events | 1 + util/userfaultfd.c | 49 +++++- 18 files changed, 354 insertions(+), 29 deletions(-) -- 2.37.3
