Signed-off-by: Lin Ma <l...@suse.com> --- docs/devel/migration.rst | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/docs/devel/migration.rst b/docs/devel/migration.rst index 2401253482..dfdd3f20b4 100644 --- a/docs/devel/migration.rst +++ b/docs/devel/migration.rst @@ -639,6 +639,15 @@ postcopy-blocktime value of qmp command will show overlapped blocking time for all vCPU, postcopy-vcpu-blocktime will show list of blocking time per vCPU. +Since kernel v5.11, Unprivileged user (without SYS_CAP_PTRACE capability) +must pass UFFD_USER_MODE_ONLY to userfaultd if the unprivileged_userfaultfd +sysctl knob is 0. + +To allow unprivileged user postcopy, Issue this command on destination +monitor prior to turning on postcopy-ram: + +``migrate_set_capability postcopy-uffd-usermode-only on`` + .. note:: During the postcopy phase, the bandwidth limits set using ``migrate_set_parameter`` is ignored (to avoid delaying requested pages that -- 2.26.2
