qemu/migration/page_cache.h
Markus Armbruster 8b9407a09f migration: Clean up signed vs. unsigned XBZRLE cache-size
73af8dd8d7 "migration: Make xbzrle_cache_size a migration
parameter" (v2.11.0) made the new parameter unsigned (QAPI type
'size', uint64_t in C).  It neglected to update existing code, which
continues to use int64_t.

migrate_xbzrle_cache_size() returns the new parameter.  Adjust its
return type.

QMP query-migrate-cache-size returns migrate_xbzrle_cache_size().
Adjust its return type.

migrate-set-parameters passes the new parameter to
xbzrle_cache_resize().  Adjust its parameter type.

xbzrle_cache_resize() passes it on to cache_init().  Adjust its
parameter type.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20210202141734.2488076-3-armbru@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08 11:19:51 +00:00

75 lines
1.9 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_size: cache size in bytes
* @page_size: cache page size
* @errp: set *errp if the check failed, with reason
*/
PageCache *cache_init(uint64_t cache_size, size_t page_size, Error **errp);
/**
* 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);
#endif