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memory: per-AddressSpace dispatch

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Currently we use a global radix tree to dispatch memory access.  This only
works with a single address space; to support multiple address spaces we
make the radix tree a member of AddressSpace (via an intermediate structure
AddressSpaceDispatch to avoid exposing too many internals).

A side effect is that address_space_io also gains a dispatch table.  When
we remove all the pre-memory-API I/O registrations, we can use that for
dispatching I/O and get rid of the original I/O dispatch.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2012-10-03 16:22:53 +02:00
parent 0e8a6d47af
commit ac1970fbe8
6 changed files with 194 additions and 71 deletions
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62
memory.h
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@ -169,6 +169,7 @@ struct AddressSpace {
struct FlatView *current_map;
int ioeventfd_nb;
struct MemoryRegionIoeventfd *ioeventfds;
struct AddressSpaceDispatch *dispatch;
QTAILQ_ENTRY(AddressSpace) address_spaces_link;
};
@ -803,6 +804,67 @@ void mtree_info(fprintf_function mon_printf, void *f);
*/
void address_space_init(AddressSpace *as, MemoryRegion *root);
/**
* address_space_rw: read from or write to an address space.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @buf: buffer with the data transferred
* @is_write: indicates the transfer direction
*/
void address_space_rw(AddressSpace *as, target_phys_addr_t addr, uint8_t *buf,
int len, bool is_write);
/**
* address_space_write: write to address space.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @buf: buffer with the data transferred
*/
void address_space_write(AddressSpace *as, target_phys_addr_t addr,
const uint8_t *buf, int len);
/**
* address_space_read: read from an address space.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @buf: buffer with the data transferred
*/
void address_space_read(AddressSpace *as, target_phys_addr_t addr, uint8_t *buf, int len);
/* address_space_map: map a physical memory region into a host virtual address
*
* May map a subset of the requested range, given by and returned in @plen.
* May return %NULL if resources needed to perform the mapping are exhausted.
* Use only for reads OR writes - not for read-modify-write operations.
* Use cpu_register_map_client() to know when retrying the map operation is
* likely to succeed.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @plen: pointer to length of buffer; updated on return
* @is_write: indicates the transfer direction
*/
void *address_space_map(AddressSpace *as, target_phys_addr_t addr,
target_phys_addr_t *plen, bool is_write);
/* address_space_unmap: Unmaps a memory region previously mapped by address_space_map()
*
* Will also mark the memory as dirty if @is_write == %true. @access_len gives
* the amount of memory that was actually read or written by the caller.
*
* @as: #AddressSpace used
* @addr: address within that address space
* @len: buffer length as returned by address_space_map()
* @access_len: amount of data actually transferred
* @is_write: indicates the transfer direction
*/
void address_space_unmap(AddressSpace *as, void *buffer, target_phys_addr_t len,
int is_write, target_phys_addr_t access_len);
#endif
#endif