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envelope-from=lma@suse.com; helo=de-smtp-delivery-102.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Lin Ma --- 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