diff options
| -rw-r--r-- | hw/i386/xen/xen-mapcache.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/hw/i386/xen/xen-mapcache.c b/hw/i386/xen/xen-mapcache.c index bb1078c681..369c3df8a0 100644 --- a/hw/i386/xen/xen-mapcache.c +++ b/hw/i386/xen/xen-mapcache.c @@ -234,7 +234,8 @@ static void xen_remap_bucket(MapCacheEntry *entry, static uint8_t *xen_map_cache_unlocked(hwaddr phys_addr, hwaddr size, uint8_t lock, bool dma) { - MapCacheEntry *entry, *pentry = NULL; + MapCacheEntry *entry, *pentry = NULL, + *free_entry = NULL, *free_pentry = NULL; hwaddr address_index; hwaddr address_offset; hwaddr cache_size = size; @@ -281,14 +282,22 @@ tryagain: entry = &mapcache->entry[address_index % mapcache->nr_buckets]; - while (entry && entry->lock && entry->vaddr_base && + while (entry && (lock || entry->lock) && entry->vaddr_base && (entry->paddr_index != address_index || entry->size != cache_size || !test_bits(address_offset >> XC_PAGE_SHIFT, test_bit_size >> XC_PAGE_SHIFT, entry->valid_mapping))) { + if (!free_entry && !entry->lock) { + free_entry = entry; + free_pentry = pentry; + } pentry = entry; entry = entry->next; } + if (!entry && free_entry) { + entry = free_entry; + pentry = free_pentry; + } if (!entry) { entry = g_malloc0(sizeof (MapCacheEntry)); pentry->next = entry; |