mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 03:59:52 +00:00
aa3544c371
It is only used by migration, so move it there. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
|
|
* Page cache for QEMU
|
|
* The cache is base on a hash of the page address
|
|
*
|
|
* Copyright 2012 Red Hat, Inc. and/or its affiliates
|
|
*
|
|
* Authors:
|
|
* Orit Wasserman <owasserm@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 PAGE_CACHE_H
|
|
#define PAGE_CACHE_H
|
|
|
|
/* Page cache for storing guest pages */
|
|
typedef struct PageCache PageCache;
|
|
|
|
/**
|
|
* cache_init: Initialize the page cache
|
|
*
|
|
*
|
|
* Returns new allocated cache or NULL on error
|
|
*
|
|
* @cache pointer to the PageCache struct
|
|
* @num_pages: cache maximal number of cached pages
|
|
* @page_size: cache page size
|
|
*/
|
|
PageCache *cache_init(int64_t num_pages, unsigned int page_size);
|
|
|
|
/**
|
|
* cache_fini: free all cache resources
|
|
* @cache pointer to the PageCache struct
|
|
*/
|
|
void cache_fini(PageCache *cache);
|
|
|
|
/**
|
|
* cache_is_cached: Checks to see if the page is cached
|
|
*
|
|
* Returns %true if page is cached
|
|
*
|
|
* @cache pointer to the PageCache struct
|
|
* @addr: page addr
|
|
* @current_age: current bitmap generation
|
|
*/
|
|
bool cache_is_cached(const PageCache *cache, uint64_t addr,
|
|
uint64_t current_age);
|
|
|
|
/**
|
|
* get_cached_data: Get the data cached for an addr
|
|
*
|
|
* Returns pointer to the data cached or NULL if not cached
|
|
*
|
|
* @cache pointer to the PageCache struct
|
|
* @addr: page addr
|
|
*/
|
|
uint8_t *get_cached_data(const PageCache *cache, uint64_t addr);
|
|
|
|
/**
|
|
* cache_insert: insert the page into the cache. the page cache
|
|
* will dup the data on insert. the previous value will be overwritten
|
|
*
|
|
* Returns -1 when the page isn't inserted into cache
|
|
*
|
|
* @cache pointer to the PageCache struct
|
|
* @addr: page address
|
|
* @pdata: pointer to the page
|
|
* @current_age: current bitmap generation
|
|
*/
|
|
int cache_insert(PageCache *cache, uint64_t addr, const uint8_t *pdata,
|
|
uint64_t current_age);
|
|
|
|
/**
|
|
* cache_resize: resize the page cache. In case of size reduction the extra
|
|
* pages will be freed
|
|
*
|
|
* Returns -1 on error new cache size on success
|
|
*
|
|
* @cache pointer to the PageCache struct
|
|
* @num_pages: new page cache size (in pages)
|
|
*/
|
|
int64_t cache_resize(PageCache *cache, int64_t num_pages);
|
|
|
|
#endif
|