On 13/02/21 01:50, Sean Christopherson wrote:
- * Nothing to do for RO slots or CREATE/MOVE/DELETE of a slot.
- * See comments below.
+ * Nothing to do for RO slots (which can't be dirtied and can't be made
+ * writable) or CREATE/MOVE/DELETE of a slot. See comments below.
*/
if ((change != KVM_MR_FLAGS_ONLY) || (new->flags & KVM_MEM_READONLY))
return;
+ /*
+ * READONLY and non-flags changes were filtered out above, and the only
+ * other flag is LOG_DIRTY_PAGES, i.e. something is wrong if dirty
+ * logging isn't being toggled on or off.
+ */
+ if (WARN_ON_ONCE(!((old->flags ^ new->flags) & KVM_MEM_LOG_DIRTY_PAGES)))
+ return;
+
What about readonly -> readwrite changes?
Paolo
