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| author |   Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com> | 2023-10-10 11:40:56 +0000 |
|---|---|---|
| committer | Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com> | 2023-10-10 11:40:56 +0000 |
| commit | e02cda008591317b1625707ff8e115a4841aa889 (patch) | |
| tree | aee302e3cf8b59ec2d32ec481be3d1afddfc8968 /migration/page_cache.h | |
| parent | cc668e6b7e0ffd8c9d130513d12053cf5eda1d3b (diff) | |
Introduce Virtio-loopback epsilon release:
Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.
Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9
Diffstat (limited to 'migration/page_cache.h')
| -rw-r--r-- | migration/page_cache.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/migration/page_cache.h b/migration/page_cache.h new file mode 100644 index 000000000..8733b4df6 --- /dev/null +++ b/migration/page_cache.h @@ -0,0 +1,74 @@ +/* + * 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 |