diff options
Diffstat (limited to 'include/exec/memory.h')
| -rw-r--r-- | include/exec/memory.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h index 16784941b5..71a27ab10f 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -32,6 +32,8 @@ #include "qom/object.h" #include "qemu/rcu.h" +#define RAM_ADDR_INVALID (~(ram_addr_t)0) + #define MAX_PHYS_ADDR_SPACE_BITS 62 #define MAX_PHYS_ADDR (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1) @@ -678,6 +680,24 @@ int memory_region_get_fd(MemoryRegion *mr); void memory_region_set_fd(MemoryRegion *mr, int fd); /** + * memory_region_from_host: Convert a pointer into a RAM memory region + * and an offset within it. + * + * Given a host pointer inside a RAM memory region (created with + * memory_region_init_ram() or memory_region_init_ram_ptr()), return + * the MemoryRegion and the offset within it. + * + * Use with care; by the time this function returns, the returned pointer is + * not protected by RCU anymore. If the caller is not within an RCU critical + * section and does not hold the iothread lock, it must have other means of + * protecting the pointer, such as a reference to the region that includes + * the incoming ram_addr_t. + * + * @mr: the memory region being queried. + */ +MemoryRegion *memory_region_from_host(void *ptr, ram_addr_t *offset); + +/** * memory_region_get_ram_ptr: Get a pointer into a RAM memory region. * * Returns a host pointer to a RAM memory region (created with |