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18 /* Return true if the host supports everything we need to do postcopy-ram */
23  * Make all of RAM sensitive to accesses to areas that haven't yet been written
24  * and wire up anything necessary to deal with it.
29  * Initialise postcopy-ram, setting the RAM to a state where we can go into
30  * postcopy later; must be called prior to any precopy.
41  * Userfault requires us to mark RAM as NOHUGEPAGE prior to discard
53  * Called by the bitmap code for each chunk to discard.
54  * May send a discard message, may just leave it queued to
57  *  RAM block passed to postcopy_discard_send_init() (length=1 is one page)
71  *    to use other postcopy_ routines to allocate.
87  * in general only one thread should be writing to the state at any one
90  * The state is checked as messages are received to ensure that
92  * The state is also used by the RAM reception code to know if it
93  * has to place pages atomically, and the cleanup code at the end of
94  * the main thread to know if it has to delay cleanup until the end
113  * To be called once at the start before any device initialisation
117 /* Add a notifier to a list to be called when checking whether the devices
121  * On failure it must set the data->errp to an error.
146 /* ufd is a pointer to the struct uffd_msg *TODO: more Portable! */
148 /* Notification to wake, either on place or on reception of
155     /* Data to pass to handler */
157     /* Handler to be called whenever we get a poll event */
159     /* Notification to wake shared client */
161     /* A string to use in error messages */
184 /* Callback from shared fault handlers to ask for a page */