f0a227ade4
Mark the area of RAM as 'userfault' Start up a fault-thread to handle any userfaults we might receive from it (to be filled in later) Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/*
|
|
* Postcopy migration for RAM
|
|
*
|
|
* Copyright 2013 Red Hat, Inc. and/or its affiliates
|
|
*
|
|
* Authors:
|
|
* Dave Gilbert <dgilbert@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
#ifndef QEMU_POSTCOPY_RAM_H
|
|
#define QEMU_POSTCOPY_RAM_H
|
|
|
|
/* Return true if the host supports everything we need to do postcopy-ram */
|
|
bool postcopy_ram_supported_by_host(void);
|
|
|
|
/*
|
|
* Make all of RAM sensitive to accesses to areas that haven't yet been written
|
|
* and wire up anything necessary to deal with it.
|
|
*/
|
|
int postcopy_ram_enable_notify(MigrationIncomingState *mis);
|
|
|
|
/*
|
|
* Initialise postcopy-ram, setting the RAM to a state where we can go into
|
|
* postcopy later; must be called prior to any precopy.
|
|
* called from ram.c's similarly named ram_postcopy_incoming_init
|
|
*/
|
|
int postcopy_ram_incoming_init(MigrationIncomingState *mis, size_t ram_pages);
|
|
|
|
/*
|
|
* At the end of a migration where postcopy_ram_incoming_init was called.
|
|
*/
|
|
int postcopy_ram_incoming_cleanup(MigrationIncomingState *mis);
|
|
|
|
/*
|
|
* Discard the contents of 'length' bytes from 'start'
|
|
* We can assume that if we've been called postcopy_ram_hosttest returned true
|
|
*/
|
|
int postcopy_ram_discard_range(MigrationIncomingState *mis, uint8_t *start,
|
|
size_t length);
|
|
|
|
|
|
/*
|
|
* Called at the start of each RAMBlock by the bitmap code.
|
|
* 'offset' is the bitmap offset of the named RAMBlock in the migration
|
|
* bitmap.
|
|
* Returns a new PDS
|
|
*/
|
|
PostcopyDiscardState *postcopy_discard_send_init(MigrationState *ms,
|
|
unsigned long offset,
|
|
const char *name);
|
|
|
|
/*
|
|
* Called by the bitmap code for each chunk to discard.
|
|
* May send a discard message, may just leave it queued to
|
|
* be sent later.
|
|
* @start,@length: a range of pages in the migration bitmap in the
|
|
* RAM block passed to postcopy_discard_send_init() (length=1 is one page)
|
|
*/
|
|
void postcopy_discard_send_range(MigrationState *ms, PostcopyDiscardState *pds,
|
|
unsigned long start, unsigned long length);
|
|
|
|
/*
|
|
* Called at the end of each RAMBlock by the bitmap code.
|
|
* Sends any outstanding discard messages, frees the PDS.
|
|
*/
|
|
void postcopy_discard_send_finish(MigrationState *ms,
|
|
PostcopyDiscardState *pds);
|
|
|
|
#endif
|