diff options
| -rw-r--r-- | xen-mapcache.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/xen-mapcache.c b/xen-mapcache.c index dc6d1fadb7..a80cbdb6a7 100644 --- a/xen-mapcache.c +++ b/xen-mapcache.c @@ -74,8 +74,7 @@ typedef struct MapCache { QTAILQ_HEAD(map_cache_head, MapCacheRev) locked_entries; /* For most cases (>99.9%), the page address is the same. */ - hwaddr last_address_index; - uint8_t *last_address_vaddr; + MapCacheEntry *last_entry; unsigned long max_mcache_size; unsigned int mcache_bucket_shift; @@ -105,7 +104,6 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque) mapcache->opaque = opaque; QTAILQ_INIT(&mapcache->locked_entries); - mapcache->last_address_index = -1; if (geteuid() == 0) { rlimit_as.rlim_cur = RLIM_INFINITY; @@ -210,9 +208,11 @@ tryagain: trace_xen_map_cache(phys_addr); - if (address_index == mapcache->last_address_index && !lock && !__size) { - trace_xen_map_cache_return(mapcache->last_address_vaddr + address_offset); - return mapcache->last_address_vaddr + address_offset; + if (mapcache->last_entry != NULL && + mapcache->last_entry->paddr_index == address_index && + !lock && !__size) { + trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset); + return mapcache->last_entry->vaddr_base + address_offset; } /* size is always a multiple of MCACHE_BUCKET_SIZE */ @@ -249,7 +249,7 @@ tryagain: if(!test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT, entry->valid_mapping)) { - mapcache->last_address_index = -1; + mapcache->last_entry = NULL; if (!translated && mapcache->phys_offset_to_gaddr) { phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size, mapcache->opaque); translated = true; @@ -259,19 +259,18 @@ tryagain: return NULL; } - mapcache->last_address_index = address_index; - mapcache->last_address_vaddr = entry->vaddr_base; + mapcache->last_entry = entry; if (lock) { MapCacheRev *reventry = g_malloc0(sizeof(MapCacheRev)); entry->lock++; - reventry->vaddr_req = mapcache->last_address_vaddr + address_offset; - reventry->paddr_index = mapcache->last_address_index; + reventry->vaddr_req = mapcache->last_entry->vaddr_base + address_offset; + reventry->paddr_index = mapcache->last_entry->paddr_index; reventry->size = entry->size; QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next); } - trace_xen_map_cache_return(mapcache->last_address_vaddr + address_offset); - return mapcache->last_address_vaddr + address_offset; + trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset); + return mapcache->last_entry->vaddr_base + address_offset; } ram_addr_t xen_ram_addr_from_mapcache(void *ptr) @@ -338,9 +337,9 @@ void xen_invalidate_map_cache_entry(uint8_t *buffer) QTAILQ_REMOVE(&mapcache->locked_entries, reventry, next); g_free(reventry); - if (mapcache->last_address_index == paddr_index) { - mapcache->last_address_index = -1; - mapcache->last_address_vaddr = NULL; + if (mapcache->last_entry != NULL && + mapcache->last_entry->paddr_index == paddr_index) { + mapcache->last_entry = NULL; } entry = &mapcache->entry[paddr_index % mapcache->nr_buckets]; @@ -404,8 +403,7 @@ void xen_invalidate_map_cache(void) entry->valid_mapping = NULL; } - mapcache->last_address_index = -1; - mapcache->last_address_vaddr = NULL; + mapcache->last_entry = NULL; mapcache_unlock(); } |