| Message ID | 20211014091551.15201-3-lma@suse.com |
|---|---|
| State | New |
| Headers | show
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| Series |
Postcopy migration: Add userfaultfd- user-mode-only capability
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expand
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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
Signed-off-by: Lin Ma <lma@suse.com> --- docs/devel/migration.rst | 9 +++++++++ 1 file changed, 9 insertions(+)