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-rw-r--r--Documentation/virt/kvm/api.rst18
-rw-r--r--Documentation/virt/kvm/devices/vm.rst4
2 files changed, 16 insertions, 6 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index b8ec88ef2efa..1bc61bf804f1 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -4483,6 +4483,18 @@ not holding a previously reported uncorrected error).
:Parameters: struct kvm_s390_cmma_log (in, out)
:Returns: 0 on success, a negative value on error
+Errors:
+
+ ====== =============================================================
+ ENOMEM not enough memory can be allocated to complete the task
+ ENXIO if CMMA is not enabled
+ EINVAL if KVM_S390_CMMA_PEEK is not set but migration mode was not enabled
+ EINVAL if KVM_S390_CMMA_PEEK is not set but dirty tracking has been
+ disabled (and thus migration mode was automatically disabled)
+ EFAULT if the userspace address is invalid or if no page table is
+ present for the addresses (e.g. when using hugepages).
+ ====== =============================================================
+
This ioctl is used to get the values of the CMMA bits on the s390
architecture. It is meant to be used in two scenarios:
@@ -4563,12 +4575,6 @@ mask is unused.
values points to the userspace buffer where the result will be stored.
-This ioctl can fail with -ENOMEM if not enough memory can be allocated to
-complete the task, with -ENXIO if CMMA is not enabled, with -EINVAL if
-KVM_S390_CMMA_PEEK is not set but migration mode was not enabled, with
--EFAULT if the userspace address is invalid or if no page table is
-present for the addresses (e.g. when using hugepages).
-
4.108 KVM_S390_SET_CMMA_BITS
----------------------------
diff --git a/Documentation/virt/kvm/devices/vm.rst b/Documentation/virt/kvm/devices/vm.rst
index 60acc39e0e93..147efec626e5 100644
--- a/Documentation/virt/kvm/devices/vm.rst
+++ b/Documentation/virt/kvm/devices/vm.rst
@@ -302,6 +302,10 @@ 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);