qemu

FORK: QEMU emulator
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block-ram-registrar.c (1507B)

      1 /*
      2  * BlockBackend RAM Registrar
      3  *
      4  * SPDX-License-Identifier: GPL-2.0-or-later
      5  */
      6 
      7 #include "qemu/osdep.h"
      8 #include "sysemu/block-backend.h"
      9 #include "sysemu/block-ram-registrar.h"
     10 #include "qapi/error.h"
     11 
     12 static void ram_block_added(RAMBlockNotifier *n, void *host, size_t size,
     13                             size_t max_size)
     14 {
     15     BlockRAMRegistrar *r = container_of(n, BlockRAMRegistrar, notifier);
     16     Error *err = NULL;
     17 
     18     if (!r->ok) {
     19         return; /* don't try again if we've already failed */
     20     }
     21 
     22     if (!blk_register_buf(r->blk, host, max_size, &err)) {
     23         error_report_err(err);
     24         ram_block_notifier_remove(&r->notifier);
     25         r->ok = false;
     26     }
     27 }
     28 
     29 static void ram_block_removed(RAMBlockNotifier *n, void *host, size_t size,
     30                               size_t max_size)
     31 {
     32     BlockRAMRegistrar *r = container_of(n, BlockRAMRegistrar, notifier);
     33     blk_unregister_buf(r->blk, host, max_size);
     34 }
     35 
     36 void blk_ram_registrar_init(BlockRAMRegistrar *r, BlockBackend *blk)
     37 {
     38     r->blk = blk;
     39     r->notifier = (RAMBlockNotifier){
     40         .ram_block_added = ram_block_added,
     41         .ram_block_removed = ram_block_removed,
     42 
     43         /*
     44          * .ram_block_resized() is not necessary because we use the max_size
     45          * value that does not change across resize.
     46          */
     47     };
     48     r->ok = true;
     49 
     50     ram_block_notifier_add(&r->notifier);
     51 }
     52 
     53 void blk_ram_registrar_destroy(BlockRAMRegistrar *r)
     54 {
     55     if (r->ok) {
     56         ram_block_notifier_remove(&r->notifier);
     57     }
     58 }