Since kernel v5.11, Unprivileged user (without SYS_CAP_PTRACE capability) must pass UFFD_USER_MODE_ONLY to userfaultd in case unprivileged_userfaultfd sysctl knob is 0. Please refer to https://lwn.net/Articles/819834/ and the kernel commits: 37cd0575 userfaultfd: add UFFD_USER_MODE_ONLY d0d4730a userfaultfd: add user-mode only option to unprivileged_userfaultfd sysctl knob
This patch set adds a migration capability to pass UFFD_USER_MODE_ONLY for postcopy migration. Lin Ma (3): migration: introduce postcopy-uffd-usermode-only capability migration: postcopy-uffd-usermode-only documentation tests: add postcopy-uffd-usermode-only capability into migration-test docs/devel/migration.rst | 9 +++++++++ migration/migration.c | 9 +++++++++ migration/migration.h | 1 + migration/postcopy-ram.c | 22 +++++++++++++++++++--- qapi/migration.json | 8 +++++++- tests/qtest/migration-test.c | 11 +++++++++-- 6 files changed, 54 insertions(+), 6 deletions(-) -- 2.26.2
