diff options
Diffstat (limited to 'exec.c')
| -rw-r--r-- | exec.c | 29 |
1 files changed, 27 insertions, 2 deletions
@@ -213,6 +213,7 @@ bool memory_region_is_unassigned(MemoryRegion *mr) void cpu_exec_init_all(void) { #if !defined(CONFIG_USER_ONLY) + qemu_mutex_init(&ram_list.mutex); memory_map_init(); io_mem_init(); #endif @@ -801,6 +802,16 @@ void qemu_flush_coalesced_mmio_buffer(void) kvm_flush_coalesced_mmio_buffer(); } +void qemu_mutex_lock_ramlist(void) +{ + qemu_mutex_lock(&ram_list.mutex); +} + +void qemu_mutex_unlock_ramlist(void) +{ + qemu_mutex_unlock(&ram_list.mutex); +} + #if defined(__linux__) && !defined(TARGET_S390X) #include <sys/vfs.h> @@ -982,6 +993,8 @@ void qemu_ram_set_idstr(ram_addr_t addr, const char *name, DeviceState *dev) } pstrcat(new_block->idstr, sizeof(new_block->idstr), name); + /* This assumes the iothread lock is taken here too. */ + qemu_mutex_lock_ramlist(); QTAILQ_FOREACH(block, &ram_list.blocks, next) { if (block != new_block && !strcmp(block->idstr, new_block->idstr)) { fprintf(stderr, "RAMBlock \"%s\" already registered, abort!\n", @@ -989,6 +1002,7 @@ void qemu_ram_set_idstr(ram_addr_t addr, const char *name, DeviceState *dev) abort(); } } + qemu_mutex_unlock_ramlist(); } static int memory_try_enable_merging(void *addr, size_t len) @@ -1012,6 +1026,8 @@ ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, size = TARGET_PAGE_ALIGN(size); new_block = g_malloc0(sizeof(*new_block)); + /* This assumes the iothread lock is taken here too. */ + qemu_mutex_lock_ramlist(); new_block->mr = mr; new_block->offset = find_ram_offset(size); if (host) { @@ -1057,6 +1073,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, ram_list.mru_block = NULL; ram_list.version++; + qemu_mutex_unlock_ramlist(); ram_list.phys_dirty = g_realloc(ram_list.phys_dirty, last_ram_offset() >> TARGET_PAGE_BITS); @@ -1082,21 +1099,26 @@ void qemu_ram_free_from_ptr(ram_addr_t addr) { RAMBlock *block; + /* This assumes the iothread lock is taken here too. */ + qemu_mutex_lock_ramlist(); QTAILQ_FOREACH(block, &ram_list.blocks, next) { if (addr == block->offset) { QTAILQ_REMOVE(&ram_list.blocks, block, next); ram_list.mru_block = NULL; ram_list.version++; g_free(block); - return; + break; } } + qemu_mutex_unlock_ramlist(); } void qemu_ram_free(ram_addr_t addr) { RAMBlock *block; + /* This assumes the iothread lock is taken here too. */ + qemu_mutex_lock_ramlist(); QTAILQ_FOREACH(block, &ram_list.blocks, next) { if (addr == block->offset) { QTAILQ_REMOVE(&ram_list.blocks, block, next); @@ -1127,9 +1149,10 @@ void qemu_ram_free(ram_addr_t addr) #endif } g_free(block); - return; + break; } } + qemu_mutex_unlock_ramlist(); } @@ -1207,6 +1230,7 @@ void *qemu_get_ram_ptr(ram_addr_t addr) { RAMBlock *block; + /* The list is protected by the iothread lock here. */ block = ram_list.mru_block; if (block && addr - block->offset < block->length) { goto found; @@ -1246,6 +1270,7 @@ static void *qemu_safe_ram_ptr(ram_addr_t addr) { RAMBlock *block; + /* The list is protected by the iothread lock here. */ QTAILQ_FOREACH(block, &ram_list.blocks, next) { if (addr - block->offset < block->length) { if (xen_enabled()) { |