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fw_cfg: add write callback

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Reintroduce the write callback that was removed when write support was
removed in commit 023e314856.

Contrary to the previous callback implementation, the write_cb
callback is called whenever a write happened, so handlers must be
ready to handle partial write as necessary.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-09-11 18:59:23 +02:00 • committed by Michael S. Tsirkin
parent 06592d7e28
commit 5f9252f7cc
6 changed files with 18 additions and 9 deletions
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3
include/hw/nvram/fw_cfg.h
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@ -45,6 +45,7 @@ typedef struct FWCfgDmaAccess {
} QEMU_PACKED FWCfgDmaAccess;
typedef void (*FWCfgCallback)(void *opaque);
typedef void (*FWCfgWriteCallback)(void *opaque, off_t start, size_t len);
struct FWCfgState {
/*< private >*/
@ -183,6 +184,7 @@ void fw_cfg_add_file(FWCfgState *s, const char *filename, void *data,
* @s: fw_cfg device being modified
* @filename: name of new fw_cfg file item
* @select_cb: callback function when selecting
* @write_cb: callback function after a write
* @callback_opaque: argument to be passed into callback function
* @data: pointer to start of item data
* @len: size of item data
@ -202,6 +204,7 @@ void fw_cfg_add_file(FWCfgState *s, const char *filename, void *data,
*/
void fw_cfg_add_file_callback(FWCfgState *s, const char *filename,
FWCfgCallback select_cb,
FWCfgWriteCallback write_cb,
void *callback_opaque,
void *data, size_t len, bool read_only);