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-rw-r--r--Documentation/virt/kvm/devices/vm.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/devices/vm.txt b/Documentation/virt/kvm/devices/vm.txt
index 4ffb82b02468..38ec142a4a84 100644
--- a/Documentation/virt/kvm/devices/vm.txt
+++ b/Documentation/virt/kvm/devices/vm.txt
@@ -254,6 +254,10 @@ Allows userspace to start migration mode, needed for PGSTE migration.
Setting this attribute when migration mode is already active will have
no effects.
+Dirty tracking must be enabled on all memslots, else -EINVAL is returned. When
+dirty tracking is disabled on any memslot, migration mode is automatically
+stopped.
+
Parameters: none
Returns: -ENOMEM if there is not enough free memory to start migration mode
-EINVAL if the state of the VM is invalid (e.g. no memory defined)