diff --git a/dma-helpers.c b/dma-helpers.c
index af07aab..92c5d55 100644
--- a/dma-helpers.c
+++ b/dma-helpers.c
@@ -70,7 +70,7 @@ void qemu_sglist_destroy(QEMUSGList *qsg)
 
 typedef struct {
     BlockAIOCB common;
-    BlockBackend *blk;
+    AioContext *ctx;
     BlockAIOCB *acb;
     QEMUSGList *sg;
     uint64_t offset;
@@ -80,6 +80,7 @@ typedef struct {
     QEMUIOVector iov;
     QEMUBH *bh;
     DMAIOFunc *io_func;
+    void *io_func_opaque;
 } DMAAIOCB;
 
 static void dma_blk_cb(void *opaque, int ret);
@@ -154,8 +155,7 @@ static void dma_blk_cb(void *opaque, int ret)
 
     if (dbs->iov.size == 0) {
         trace_dma_map_wait(dbs);
-        dbs->bh = aio_bh_new(blk_get_aio_context(dbs->blk),
-                             reschedule_dma, dbs);
+        dbs->bh = aio_bh_new(dbs->ctx, reschedule_dma, dbs);
         cpu_register_map_client(dbs->bh);
         return;
     }
@@ -164,8 +164,8 @@ static void dma_blk_cb(void *opaque, int ret)
         qemu_iovec_discard_back(&dbs->iov, dbs->iov.size & ~BDRV_SECTOR_MASK);
     }
 
-    dbs->acb = dbs->io_func(dbs->blk, dbs->offset, &dbs->iov, 0,
-                            dma_blk_cb, dbs);
+    dbs->acb = dbs->io_func(dbs->offset, &dbs->iov,
+                            dma_blk_cb, dbs, dbs->io_func_opaque);
     assert(dbs->acb);
 }
 
@@ -191,23 +191,25 @@ static const AIOCBInfo dma_aiocb_info = {
     .cancel_async       = dma_aio_cancel,
 };
 
-BlockAIOCB *dma_blk_io(
-    BlockBackend *blk, QEMUSGList *sg, uint64_t offset,
-    DMAIOFunc *io_func, BlockCompletionFunc *cb,
+BlockAIOCB *dma_blk_io(AioContext *ctx,
+    QEMUSGList *sg, uint64_t opaque,
+    DMAIOFunc *io_func, void *io_func_opaque,
+    BlockCompletionFunc *cb,
     void *opaque, DMADirection dir)
 {
-    DMAAIOCB *dbs = blk_aio_get(&dma_aiocb_info, blk, cb, opaque);
+    DMAAIOCB *dbs = qemu_aio_get(&dma_aiocb_info, NULL, cb, opaque);
 
-    trace_dma_blk_io(dbs, blk, offset, (dir == DMA_DIRECTION_TO_DEVICE));
+    trace_dma_blk_io(dbs, io_func_opaque, offset, (dir == DMA_DIRECTION_TO_DEVICE));
 
     dbs->acb = NULL;
-    dbs->blk = blk;
     dbs->sg = sg;
+    dbs->ctx = ctx;
     dbs->offset = offset;
     dbs->sg_cur_index = 0;
     dbs->sg_cur_byte = 0;
     dbs->dir = dir;
     dbs->io_func = io_func;
+    dbs->io_func_opaque = io_func_opaque;
     dbs->bh = NULL;
     qemu_iovec_init(&dbs->iov, sg->nsg);
     dma_blk_cb(dbs, 0);
@@ -215,19 +217,39 @@ BlockAIOCB *dma_blk_io(
 }
 
 
+static
+BlockAIOCB *dma_blk_read_io_func(int64_t offset, QEMUIOVector *iov,
+                                 BlockCompletionFunc *cb, void *cb_opaque,
+                                 void *opaque)
+{
+    BlockBackend *blk = opaque;
+    return blk_aio_preadv(blk, offset, iov, 0, cb, cb_opaque);
+}
+
 BlockAIOCB *dma_blk_read(BlockBackend *blk,
                          QEMUSGList *sg, uint64_t offset,
                          void (*cb)(void *opaque, int ret), void *opaque)
 {
-    return dma_blk_io(blk, sg, offset, blk_aio_preadv, cb, opaque,
+    return dma_blk_io(blk_get_aio_context(blk),
+                      sg, offset, dma_blk_read_io_func, blk, cb, opaque,
                       DMA_DIRECTION_FROM_DEVICE);
 }
 
+static
+BlockAIOCB *dma_blk_write_io_func(int64_t offset, QEMUIOVector *iov,
+                                  BlockCompletionFunc *cb, void *cb_opaque,
+                                  void *opaque)
+{
+    BlockBackend *blk = opaque;
+    return blk_aio_pwritev(blk, offset, iov, 0, cb, cb_opaque);
+}
+
 BlockAIOCB *dma_blk_write(BlockBackend *blk,
                           QEMUSGList *sg, uint64_t offset,
                           void (*cb)(void *opaque, int ret), void *opaque)
 {
-    return dma_blk_io(blk, sg, offset, blk_aio_pwritev, cb, opaque,
+    return dma_blk_io(blk_get_aio_context(blk),
+                      sg, offset, dma_blk_write_io_func, blk, cb, opaque,
                       DMA_DIRECTION_TO_DEVICE);
 }
 
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 7326189..029f6b9 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -441,13 +441,14 @@ static void ide_issue_trim_cb(void *opaque, int ret)
     }
 }
 
-BlockAIOCB *ide_issue_trim(BlockBackend *blk,
-        int64_t offset, QEMUIOVector *qiov, BdrvRequestFlags flags,
-        BlockCompletionFunc *cb, void *opaque)
+BlockAIOCB *ide_issue_trim(
+        int64_t offset, QEMUIOVector *qiov,
+        BlockCompletionFunc *cb, void *cb_opaque, void *opaque)
 {
+    BlockBackend *blk = opaque;
     TrimAIOCB *iocb;
 
-    iocb = blk_aio_get(&trim_aiocb_info, blk, cb, opaque);
+    iocb = blk_aio_get(&trim_aiocb_info, blk, cb, cb_opaque);
     iocb->blk = blk;
     iocb->bh = qemu_bh_new(ide_trim_bh_cb, iocb);
     iocb->ret = 0;
@@ -871,8 +872,9 @@ static void ide_dma_cb(void *opaque, int ret)
                                            ide_dma_cb, s);
         break;
     case IDE_DMA_TRIM:
-        s->bus->dma->aiocb = dma_blk_io(s->blk, &s->sg, offset,
-                                        ide_issue_trim, ide_dma_cb, s,
+        s->bus->dma->aiocb = dma_blk_io(blk_get_aio_context(s->blk),
+                                        &s->sg, offset,
+                                        ide_issue_trim, s->blk, ide_dma_cb, s,
                                         DMA_DIRECTION_TO_DEVICE);
         break;
     default:
diff --git a/hw/ide/internal.h b/hw/ide/internal.h
index ceb9e59..773928a 100644
--- a/hw/ide/internal.h
+++ b/hw/ide/internal.h
@@ -613,9 +613,9 @@ void ide_transfer_start(IDEState *s, uint8_t *buf, int size,
                         EndTransferFunc *end_transfer_func);
 void ide_transfer_stop(IDEState *s);
 void ide_set_inactive(IDEState *s, bool more);
-BlockAIOCB *ide_issue_trim(BlockBackend *blk,
-        int64_t offset, QEMUIOVector *qiov, BdrvRequestFlags flags,
-        BlockCompletionFunc *cb, void *opaque);
+BlockAIOCB *ide_issue_trim(
+        int64_t offset, QEMUIOVector *qiov,
+        BlockCompletionFunc *cb, void *cb_opaque, void *opaque);
 BlockAIOCB *ide_buffered_readv(IDEState *s, int64_t sector_num,
                                QEMUIOVector *iov, int nb_sectors,
                                BlockCompletionFunc *cb, void *opaque);
diff --git a/hw/ide/macio.c b/hw/ide/macio.c
index d7d9c0f..42ad68a 100644
--- a/hw/ide/macio.c
+++ b/hw/ide/macio.c
@@ -230,7 +230,7 @@ static void pmac_dma_trim(BlockBackend *blk,
     s->io_buffer_index += io->len;
     io->len = 0;
 
-    s->bus->dma->aiocb = ide_issue_trim(blk, offset, &io->iov, 0, cb, io);
+    s->bus->dma->aiocb = ide_issue_trim(offset, &io->iov, cb, io, blk);
 }
 
 static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index f0e0c30..34c8eaf 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -194,14 +194,14 @@ void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len);
 void qemu_sglist_destroy(QEMUSGList *qsg);
 #endif
 
-typedef BlockAIOCB *DMAIOFunc(BlockBackend *blk, int64_t offset,
-                              QEMUIOVector *iov, BdrvRequestFlags flags,
-                              BlockCompletionFunc *cb, void *opaque);
+typedef BlockAIOCB *DMAIOFunc(int64_t offset, QEMUIOVector *iov,
+                              BlockCompletionFunc *cb, void *cb_opaque,
+                              void *opaque);
 
-BlockAIOCB *dma_blk_io(BlockBackend *blk,
+BlockAIOCB *dma_blk_io(AioContext *ctx,
                        QEMUSGList *sg, uint64_t offset,
-                       DMAIOFunc *io_func, BlockCompletionFunc *cb,
-                       void *opaque, DMADirection dir);
+                       DMAIOFunc *io_func, void *io_func_opaque,
+                       BlockCompletionFunc *cb, void *opaque, DMADirection dir);
 BlockAIOCB *dma_blk_read(BlockBackend *blk,
                          QEMUSGList *sg, uint64_t offset,
                          BlockCompletionFunc *cb, void *opaque);
