]>
git.proxmox.com Git - mirror_qemu.git/blob - include/migration/page_cache.h
2d5ce2dd7a2f962229496ea1590dc8ebaa9e100d
3 * The cache is base on a hash of the page address
5 * Copyright 2012 Red Hat, Inc. and/or its affiliates
8 * Orit Wasserman <owasserm@redhat.com>
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
18 /* Page cache for storing guest pages */
19 typedef struct PageCache PageCache
;
22 * cache_init: Initialize the page cache
25 * Returns new allocated cache or NULL on error
27 * @cache pointer to the PageCache struct
28 * @num_pages: cache maximal number of cached pages
29 * @page_size: cache page size
31 PageCache
*cache_init(int64_t num_pages
, unsigned int page_size
);
34 * cache_fini: free all cache resources
35 * @cache pointer to the PageCache struct
37 void cache_fini(PageCache
*cache
);
40 * cache_is_cached: Checks to see if the page is cached
42 * Returns %true if page is cached
44 * @cache pointer to the PageCache struct
47 bool cache_is_cached(const PageCache
*cache
, uint64_t addr
);
50 * get_cached_data: Get the data cached for an addr
52 * Returns pointer to the data cached or NULL if not cached
54 * @cache pointer to the PageCache struct
57 uint8_t *get_cached_data(const PageCache
*cache
, uint64_t addr
);
60 * cache_insert: insert the page into the cache. the page cache
61 * will dup the data on insert. the previous value will be overwritten
65 * @cache pointer to the PageCache struct
67 * @pdata: pointer to the page
69 int cache_insert(PageCache
*cache
, uint64_t addr
, const uint8_t *pdata
);
72 * cache_resize: resize the page cache. In case of size reduction the extra
75 * Returns -1 on error new cache size on success
77 * @cache pointer to the PageCache struct
78 * @num_pages: new page cache size (in pages)
80 int64_t cache_resize(PageCache
*cache
, int64_t num_pages
);