diff options
Diffstat (limited to 'system/memory.c')
| -rw-r--r-- | system/memory.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/system/memory.c b/system/memory.c index 5646547940..44701c465c 100644 --- a/system/memory.c +++ b/system/memory.c @@ -2546,6 +2546,21 @@ void memory_region_clear_flush_coalesced(MemoryRegion *mr) } } +void memory_region_enable_lockless_io(MemoryRegion *mr) +{ + mr->lockless_io = true; + /* + * reentrancy_guard has per device scope, that when enabled + * will effectively prevent concurrent access to device's IO + * MemoryRegion(s) by not calling accessor callback. + * + * Turn it off for lock-less IO enabled devices, to allow + * concurrent IO. + * TODO: remove this when reentrancy_guard becomes per transaction. + */ + mr->disable_reentrancy_guard = true; +} + void memory_region_add_eventfd(MemoryRegion *mr, hwaddr addr, unsigned size, |