Git Repo - qemu.git/blame_incremental - migration/page

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Commit	Line	Data
	1	/*
	2	* Page cache for QEMU
	3	* The cache is base on a hash of the page address
	4	*
	5	* Copyright 2012 Red Hat, Inc. and/or its affiliates
	6	*
	7	* Authors:
	8	* Orit Wasserman <[email protected]>
	9	*
	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.
	12	*
	13	*/
	14
	15	#ifndef PAGE_CACHE_H
	16	#define PAGE_CACHE_H
	17
	18	/* Page cache for storing guest pages */
	19	typedef struct PageCache PageCache;
	20
	21	/**
	22	* cache_init: Initialize the page cache
	23	*
	24	*
	25	* Returns new allocated cache or NULL on error
	26	*
	27	* @cache_size: cache size in bytes
	28	* @page_size: cache page size
	29	* @errp: set *errp if the check failed, with reason
	30	*/
	31	PageCache cache_init(int64_t cache_size, size_t page_size, Error *errp);
	32	/**
	33	* cache_fini: free all cache resources
	34	* @cache pointer to the PageCache struct
	35	*/
	36	void cache_fini(PageCache *cache);
	37
	38	/**
	39	* cache_is_cached: Checks to see if the page is cached
	40	*
	41	* Returns %true if page is cached
	42	*
	43	* @cache pointer to the PageCache struct
	44	* @addr: page addr
	45	* @current_age: current bitmap generation
	46	*/
	47	bool cache_is_cached(const PageCache *cache, uint64_t addr,
	48	uint64_t current_age);
	49
	50	/**
	51	* get_cached_data: Get the data cached for an addr
	52	*
	53	* Returns pointer to the data cached or NULL if not cached
	54	*
	55	* @cache pointer to the PageCache struct
	56	* @addr: page addr
	57	*/
	58	uint8_t get_cached_data(const PageCache cache, uint64_t addr);
	59
	60	/**
	61	* cache_insert: insert the page into the cache. the page cache
	62	* will dup the data on insert. the previous value will be overwritten
	63	*
	64	* Returns -1 when the page isn't inserted into cache
	65	*
	66	* @cache pointer to the PageCache struct
	67	* @addr: page address
	68	* @pdata: pointer to the page
	69	* @current_age: current bitmap generation
	70	*/
	71	int cache_insert(PageCache cache, uint64_t addr, const uint8_t pdata,
	72	uint64_t current_age);
	73
	74	#endif