diff options
| -rw-r--r-- | include/exec/memory.h | 26 | ||||
| -rw-r--r-- | memory.c | 11 |
2 files changed, 37 insertions, 0 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h index 8ae004eb06..0ebdc55506 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -180,6 +180,7 @@ struct MemoryRegion { bool rom_device; bool warning_printed; /* For reservations */ bool flush_coalesced_mmio; + bool global_locking; MemoryRegion *alias; hwaddr alias_offset; int32_t priority; @@ -825,6 +826,31 @@ void memory_region_set_flush_coalesced(MemoryRegion *mr); void memory_region_clear_flush_coalesced(MemoryRegion *mr); /** + * memory_region_set_global_locking: Declares the access processing requires + * QEMU's global lock. + * + * When this is invoked, accesses to the memory region will be processed while + * holding the global lock of QEMU. This is the default behavior of memory + * regions. + * + * @mr: the memory region to be updated. + */ +void memory_region_set_global_locking(MemoryRegion *mr); + +/** + * memory_region_clear_global_locking: Declares that access processing does + * not depend on the QEMU global lock. + * + * By clearing this property, accesses to the memory region will be processed + * outside of QEMU's global lock (unless the lock is held on when issuing the + * access request). In this case, the device model implementing the access + * handlers is responsible for synchronization of concurrency. + * + * @mr: the memory region to be updated. + */ +void memory_region_clear_global_locking(MemoryRegion *mr); + +/** * memory_region_add_eventfd: Request an eventfd to be triggered when a word * is written to a location. * @@ -1012,6 +1012,7 @@ static void memory_region_initfn(Object *obj) mr->ram_addr = RAM_ADDR_INVALID; mr->enabled = true; mr->romd_mode = true; + mr->global_locking = true; mr->destructor = memory_region_destructor_none; QTAILQ_INIT(&mr->subregions); QTAILQ_INIT(&mr->coalesced); @@ -1646,6 +1647,16 @@ void memory_region_clear_flush_coalesced(MemoryRegion *mr) } } +void memory_region_set_global_locking(MemoryRegion *mr) +{ + mr->global_locking = true; +} + +void memory_region_clear_global_locking(MemoryRegion *mr) +{ + mr->global_locking = false; +} + void memory_region_add_eventfd(MemoryRegion *mr, hwaddr addr, unsigned size, |