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memory: split memory_region_from_host from qemu_ram_addr_from_host

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Move the old qemu_ram_addr_from_host to memory_region_from_host and
make it return an offset within the region.  For qemu_ram_addr_from_host
return the ram_addr_t directly, similar to what it was before
commit 1b5ec23 ("memory: return MemoryRegion from qemu_ram_addr_from_host",
2013-07-04).

Reviewed-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-03-25 12:55:08 +01:00
parent f615f39616
commit 07bdaa4196
7 changed files with 51 additions and 20 deletions
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20
include/exec/memory.h
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@ -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)
@ -677,6 +679,24 @@ 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.
*