diff --git a/dma-helpers.c b/dma-helpers.c
index c53705a..5afba47 100644
--- a/dma-helpers.c
+++ b/dma-helpers.c
@@ -14,11 +14,9 @@
 
 /* #define DEBUG_IOMMU */
 
-int dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c, dma_addr_t len)
+int dma_memory_set(AddressSpace *as, dma_addr_t addr, uint8_t c, dma_addr_t len)
 {
-    AddressSpace *as = dma->as;
-
-    dma_barrier(dma, DMA_DIRECTION_FROM_DEVICE);
+    dma_barrier(as, DMA_DIRECTION_FROM_DEVICE);
 
 #define FILLBUF_SIZE 512
     uint8_t fillbuf[FILLBUF_SIZE];
@@ -36,13 +34,13 @@ int dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c, dma_addr_t len)
     return error;
 }
 
-void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, DMAContext *dma)
+void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, AddressSpace *as)
 {
     qsg->sg = g_malloc(alloc_hint * sizeof(ScatterGatherEntry));
     qsg->nsg = 0;
     qsg->nalloc = alloc_hint;
     qsg->size = 0;
-    qsg->dma = dma;
+    qsg->as = as;
 }
 
 void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len)
@@ -102,7 +100,7 @@ static void dma_bdrv_unmap(DMAAIOCB *dbs)
     int i;
 
     for (i = 0; i < dbs->iov.niov; ++i) {
-        dma_memory_unmap(dbs->sg->dma, dbs->iov.iov[i].iov_base,
+        dma_memory_unmap(dbs->sg->as, dbs->iov.iov[i].iov_base,
                          dbs->iov.iov[i].iov_len, dbs->dir,
                          dbs->iov.iov[i].iov_len);
     }
@@ -150,7 +148,7 @@ static void dma_bdrv_cb(void *opaque, int ret)
     while (dbs->sg_cur_index < dbs->sg->nsg) {
         cur_addr = dbs->sg->sg[dbs->sg_cur_index].base + dbs->sg_cur_byte;
         cur_len = dbs->sg->sg[dbs->sg_cur_index].len - dbs->sg_cur_byte;
-        mem = dma_memory_map(dbs->sg->dma, cur_addr, &cur_len, dbs->dir);
+        mem = dma_memory_map(dbs->sg->as, cur_addr, &cur_len, dbs->dir);
         if (!mem)
             break;
         qemu_iovec_add(&dbs->iov, mem, cur_len);
@@ -247,7 +245,7 @@ static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg,
     while (len > 0) {
         ScatterGatherEntry entry = sg->sg[sg_cur_index++];
         int32_t xfer = MIN(len, entry.len);
-        dma_memory_rw(sg->dma, entry.base, ptr, xfer, dir);
+        dma_memory_rw(sg->as, entry.base, ptr, xfer, dir);
         ptr += xfer;
         len -= xfer;
         resid -= xfer;
@@ -271,11 +269,3 @@ void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
 {
     bdrv_acct_start(bs, cookie, sg->size, type);
 }
-
-void dma_context_init(DMAContext *dma, AddressSpace *as)
-{
-#ifdef DEBUG_IOMMU
-    fprintf(stderr, "dma_context_init(%p -> %p)\n", dma, as);
-#endif
-    dma->as = as;
-}
diff --git a/exec.c b/exec.c
index 89259c9..a18f833 100644
--- a/exec.c
+++ b/exec.c
@@ -63,7 +63,6 @@ static MemoryRegion *system_io;
 
 AddressSpace address_space_io;
 AddressSpace address_space_memory;
-DMAContext dma_context_memory;
 
 MemoryRegion io_mem_rom, io_mem_notdirty;
 static MemoryRegion io_mem_unassigned;
@@ -1839,8 +1838,6 @@ static void memory_map_init(void)
     memory_listener_register(&core_memory_listener, &address_space_memory);
     memory_listener_register(&io_memory_listener, &address_space_io);
     memory_listener_register(&tcg_memory_listener, &address_space_memory);
-
-    dma_context_init(&dma_context_memory, &address_space_memory);
 }
 
 MemoryRegion *get_system_memory(void)
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 5db941c..58b0d91 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -85,7 +85,7 @@ static uint16_t nvme_map_prp(QEMUSGList *qsg, uint64_t prp1, uint64_t prp2,
         return NVME_INVALID_FIELD | NVME_DNR;
     }
 
-    qemu_sglist_init(qsg, num_prps, pci_dma_context(&n->parent_obj));
+    pci_dma_sglist_init(qsg, &n->parent_obj, num_prps);
     qemu_sglist_add(qsg, prp1, trans_len);
     len -= trans_len;
     if (len) {
diff --git a/hw/dma/pl330.c b/hw/dma/pl330.c
index 60f5299..044c087 100644
--- a/hw/dma/pl330.c
+++ b/hw/dma/pl330.c
@@ -1074,7 +1074,7 @@ static inline const PL330InsnDesc *pl330_fetch_insn(PL330Chan *ch)
     uint8_t opcode;
     int i;
 
-    dma_memory_read(&dma_context_memory, ch->pc, &opcode, 1);
+    dma_memory_read(&address_space_memory, ch->pc, &opcode, 1);
     for (i = 0; insn_desc[i].size; i++) {
         if ((opcode & insn_desc[i].opmask) == insn_desc[i].opcode) {
             return &insn_desc[i];
@@ -1088,7 +1088,7 @@ static inline void pl330_exec_insn(PL330Chan *ch, const PL330InsnDesc *insn)
     uint8_t buf[PL330_INSN_MAXSIZE];
 
     assert(insn->size <= PL330_INSN_MAXSIZE);
-    dma_memory_read(&dma_context_memory, ch->pc, buf, insn->size);
+    dma_memory_read(&address_space_memory, ch->pc, buf, insn->size);
     insn->exec(ch, buf[0], &buf[1], insn->size - 1);
 }
 
@@ -1153,7 +1153,7 @@ static int pl330_exec_cycle(PL330Chan *channel)
     if (q != NULL && q->len <= pl330_fifo_num_free(&s->fifo)) {
         int len = q->len - (q->addr & (q->len - 1));
 
-        dma_memory_read(&dma_context_memory, q->addr, buf, len);
+        dma_memory_read(&address_space_memory, q->addr, buf, len);
         if (PL330_ERR_DEBUG > 1) {
             DB_PRINT("PL330 read from memory @%08x (size = %08x):\n",
                       q->addr, len);
@@ -1185,7 +1185,7 @@ static int pl330_exec_cycle(PL330Chan *channel)
             fifo_res = pl330_fifo_get(&s->fifo, buf, len, q->tag);
         }
         if (fifo_res == PL330_FIFO_OK || q->z) {
-            dma_memory_write(&dma_context_memory, q->addr, buf, len);
+            dma_memory_write(&address_space_memory, q->addr, buf, len);
             if (PL330_ERR_DEBUG > 1) {
                 DB_PRINT("PL330 read from memory @%08x (size = %08x):\n",
                          q->addr, len);
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index eab6096..1adfa0b 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -597,7 +597,7 @@ static void ahci_write_fis_d2h(AHCIDevice *ad, uint8_t *cmd_fis)
     if (!cmd_fis) {
         /* map cmd_fis */
         uint64_t tbl_addr = le64_to_cpu(ad->cur_cmd->tbl_addr);
-        cmd_fis = dma_memory_map(ad->hba->dma, tbl_addr, &cmd_len,
+        cmd_fis = dma_memory_map(ad->hba->as, tbl_addr, &cmd_len,
                                  DMA_DIRECTION_TO_DEVICE);
         cmd_mapped = 1;
     }
@@ -630,7 +630,7 @@ static void ahci_write_fis_d2h(AHCIDevice *ad, uint8_t *cmd_fis)
     ahci_trigger_irq(ad->hba, ad, PORT_IRQ_D2H_REG_FIS);
 
     if (cmd_mapped) {
-        dma_memory_unmap(ad->hba->dma, cmd_fis, cmd_len,
+        dma_memory_unmap(ad->hba->as, cmd_fis, cmd_len,
                          DMA_DIRECTION_TO_DEVICE, cmd_len);
     }
 }
@@ -657,7 +657,7 @@ static int ahci_populate_sglist(AHCIDevice *ad, QEMUSGList *sglist, int offset)
     }
 
     /* map PRDT */
-    if (!(prdt = dma_memory_map(ad->hba->dma, prdt_addr, &prdt_len,
+    if (!(prdt = dma_memory_map(ad->hba->as, prdt_addr, &prdt_len,
                                 DMA_DIRECTION_TO_DEVICE))){
         DPRINTF(ad->port_no, "map failed\n");
         return -1;
@@ -691,7 +691,7 @@ static int ahci_populate_sglist(AHCIDevice *ad, QEMUSGList *sglist, int offset)
             goto out;
         }
 
-        qemu_sglist_init(sglist, (sglist_alloc_hint - off_idx), ad->hba->dma);
+        qemu_sglist_init(sglist, (sglist_alloc_hint - off_idx), ad->hba->as);
         qemu_sglist_add(sglist, le64_to_cpu(tbl[off_idx].addr + off_pos),
                         le32_to_cpu(tbl[off_idx].flags_size) + 1 - off_pos);
 
@@ -703,7 +703,7 @@ static int ahci_populate_sglist(AHCIDevice *ad, QEMUSGList *sglist, int offset)
     }
 
 out:
-    dma_memory_unmap(ad->hba->dma, prdt, prdt_len,
+    dma_memory_unmap(ad->hba->as, prdt, prdt_len,
                      DMA_DIRECTION_TO_DEVICE, prdt_len);
     return r;
 }
@@ -836,7 +836,7 @@ static int handle_cmd(AHCIState *s, int port, int slot)
     tbl_addr = le64_to_cpu(cmd->tbl_addr);
 
     cmd_len = 0x80;
-    cmd_fis = dma_memory_map(s->dma, tbl_addr, &cmd_len,
+    cmd_fis = dma_memory_map(s->as, tbl_addr, &cmd_len,
                              DMA_DIRECTION_FROM_DEVICE);
 
     if (!cmd_fis) {
@@ -963,7 +963,7 @@ static int handle_cmd(AHCIState *s, int port, int slot)
     }
 
 out:
-    dma_memory_unmap(s->dma, cmd_fis, cmd_len, DMA_DIRECTION_FROM_DEVICE,
+    dma_memory_unmap(s->as, cmd_fis, cmd_len, DMA_DIRECTION_FROM_DEVICE,
                      cmd_len);
 
     if (s->dev[port].port.ifs[0].status & (BUSY_STAT|DRQ_STAT)) {
@@ -1145,12 +1145,12 @@ static const IDEDMAOps ahci_dma_ops = {
     .reset = ahci_dma_reset,
 };
 
-void ahci_init(AHCIState *s, DeviceState *qdev, DMAContext *dma, int ports)
+void ahci_init(AHCIState *s, DeviceState *qdev, AddressSpace *as, int ports)
 {
     qemu_irq *irqs;
     int i;
 
-    s->dma = dma;
+    s->as = as;
     s->ports = ports;
     s->dev = g_malloc0(sizeof(AHCIDevice) * ports);
     ahci_reg_init(s);
diff --git a/hw/ide/ahci.h b/hw/ide/ahci.h
index 85f37fe..341a571 100644
--- a/hw/ide/ahci.h
+++ b/hw/ide/ahci.h
@@ -297,7 +297,7 @@ typedef struct AHCIState {
     uint32_t idp_index;     /* Current IDP index */
     int32_t ports;
     qemu_irq irq;
-    DMAContext *dma;
+    AddressSpace *as;
 } AHCIState;
 
 typedef struct AHCIPCIState {
@@ -338,7 +338,7 @@ typedef struct NCQFrame {
     uint8_t reserved10;
 } QEMU_PACKED NCQFrame;
 
-void ahci_init(AHCIState *s, DeviceState *qdev, DMAContext *dma, int ports);
+void ahci_init(AHCIState *s, DeviceState *qdev, AddressSpace *as, int ports);
 void ahci_uninit(AHCIState *s);
 
 void ahci_reset(AHCIState *s);
diff --git a/hw/ide/ich.c b/hw/ide/ich.c
index ed1f1a2..6c0c0c2 100644
--- a/hw/ide/ich.c
+++ b/hw/ide/ich.c
@@ -104,7 +104,7 @@ static int pci_ich9_ahci_init(PCIDevice *dev)
     uint8_t *sata_cap;
     d = DO_UPCAST(struct AHCIPCIState, card, dev);
 
-    ahci_init(&d->ahci, &dev->qdev, pci_dma_context(dev), 6);
+    ahci_init(&d->ahci, &dev->qdev, pci_get_address_space(dev), 6);
 
     pci_config_set_prog_interface(d->card.config, AHCI_PROGMODE_MAJOR_REV_1);
 
diff --git a/hw/ide/macio.c b/hw/ide/macio.c
index e1e4f41..a1952b0 100644
--- a/hw/ide/macio.c
+++ b/hw/ide/macio.c
@@ -71,7 +71,7 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
     s->io_buffer_size = io->len;
 
     qemu_sglist_init(&s->sg, io->len / MACIO_PAGE_SIZE + 1,
-                     &dma_context_memory);
+                     &address_space_memory);
     qemu_sglist_add(&s->sg, io->addr, io->len);
     io->addr += io->len;
     io->len = 0;
@@ -128,7 +128,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
     s->io_buffer_size = io->len;
 
     qemu_sglist_init(&s->sg, io->len / MACIO_PAGE_SIZE + 1,
-                     &dma_context_memory);
+                     &address_space_memory);
     qemu_sglist_add(&s->sg, io->addr, io->len);
     io->addr += io->len;
     io->len = 0;
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index ed9c8a1..104fe71 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -815,8 +815,6 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
                              dma_as->root, 0, memory_region_size(dma_as->root));
     memory_region_set_enabled(&pci_dev->bus_master_enable_region, false);
     address_space_init(&pci_dev->bus_master_as, &pci_dev->bus_master_enable_region);
-    pci_dev->dma = g_new(DMAContext, 1);
-    dma_context_init(pci_dev->dma, &pci_dev->bus_master_as);
 
     pci_dev->devfn = devfn;
     pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);
@@ -873,8 +871,6 @@ static void do_pci_unregister_device(PCIDevice *pci_dev)
 
     address_space_destroy(&pci_dev->bus_master_as);
     memory_region_destroy(&pci_dev->bus_master_enable_region);
-    g_free(pci_dev->dma);
-    pci_dev->dma = NULL;
 }
 
 static void pci_unregister_io_regions(PCIDevice *pci_dev)
diff --git a/hw/ppc/spapr_vio.c b/hw/ppc/spapr_vio.c
index 09cda64..459c9f2 100644
--- a/hw/ppc/spapr_vio.c
+++ b/hw/ppc/spapr_vio.c
@@ -455,7 +455,6 @@ static int spapr_vio_busdev_init(DeviceState *qdev)
         uint32_t liobn = SPAPR_VIO_BASE_LIOBN | dev->reg;
         dev->tcet = spapr_tce_new_table(liobn, pc->rtce_window_size);
         address_space_init(&dev->as, spapr_tce_get_iommu(dev->tcet));
-        dma_context_init(&dev->dma, &dev->as);
     }
 
     return pc->init(dev);
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index fe6550c..65ccb09 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -232,7 +232,7 @@ static int megasas_map_sgl(MegasasState *s, MegasasCmd *cmd, union mfi_sgl *sgl)
                                          MEGASAS_MAX_SGE);
         return iov_count;
     }
-    qemu_sglist_init(&cmd->qsg, iov_count, pci_dma_context(&s->dev));
+    pci_dma_sglist_init(&cmd->qsg, &s->dev, iov_count);
     for (i = 0; i < iov_count; i++) {
         dma_addr_t iov_pa, iov_size_p;
 
@@ -628,7 +628,7 @@ static int megasas_map_dcmd(MegasasState *s, MegasasCmd *cmd)
     }
     iov_pa = megasas_sgl_get_addr(cmd, &cmd->frame->dcmd.sgl);
     iov_size = megasas_sgl_get_len(cmd, &cmd->frame->dcmd.sgl);
-    qemu_sglist_init(&cmd->qsg, 1, pci_dma_context(&s->dev));
+    pci_dma_sglist_init(&cmd->qsg, &s->dev, 1);
     qemu_sglist_add(&cmd->qsg, iov_pa, iov_size);
     cmd->iov_size = iov_size;
     return cmd->iov_size;
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 08dd3f3..b8a0abf 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -80,7 +80,7 @@ static void virtio_scsi_bad_req(void)
 static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg,
                                    hwaddr *addr, int num)
 {
-    qemu_sglist_init(qsgl, num, &dma_context_memory);
+    qemu_sglist_init(qsgl, num, &address_space_memory);
     while (num--) {
         qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len);
     }
diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c
index 446f723..7cf4044 100644
--- a/hw/scsi/vmw_pvscsi.c
+++ b/hw/scsi/vmw_pvscsi.c
@@ -617,7 +617,7 @@ pvscsi_build_sglist(PVSCSIState *s, PVSCSIRequest *r)
 {
     PCIDevice *d = PCI_DEVICE(s);
 
-    qemu_sglist_init(&r->sgl, 1, pci_dma_context(d));
+    pci_dma_sglist_init(&r->sgl, d, 1);
     if (r->req.flags & PVSCSI_FLAG_CMD_WITH_SG_LIST) {
         pvscsi_convert_sglist(r);
     } else {
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index e64899c..0065067 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -496,7 +496,7 @@ static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
                     s->blkcnt--;
                 }
             }
-            dma_memory_write(&dma_context_memory, s->sdmasysad,
+            dma_memory_write(&address_space_memory, s->sdmasysad,
                              &s->fifo_buffer[begin], s->data_count - begin);
             s->sdmasysad += s->data_count - begin;
             if (s->data_count == block_size) {
@@ -518,7 +518,7 @@ static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
                 s->data_count = block_size;
                 boundary_count -= block_size - begin;
             }
-            dma_memory_read(&dma_context_memory, s->sdmasysad,
+            dma_memory_read(&address_space_memory, s->sdmasysad,
                             &s->fifo_buffer[begin], s->data_count);
             s->sdmasysad += s->data_count - begin;
             if (s->data_count == block_size) {
@@ -557,10 +557,10 @@ static void sdhci_sdma_transfer_single_block(SDHCIState *s)
         for (n = 0; n < datacnt; n++) {
             s->fifo_buffer[n] = sd_read_data(s->card);
         }
-        dma_memory_write(&dma_context_memory, s->sdmasysad, s->fifo_buffer,
+        dma_memory_write(&address_space_memory, s->sdmasysad, s->fifo_buffer,
                          datacnt);
     } else {
-        dma_memory_read(&dma_context_memory, s->sdmasysad, s->fifo_buffer,
+        dma_memory_read(&address_space_memory, s->sdmasysad, s->fifo_buffer,
                         datacnt);
         for (n = 0; n < datacnt; n++) {
             sd_write_data(s->card, s->fifo_buffer[n]);
@@ -588,7 +588,7 @@ static void get_adma_description(SDHCIState *s, ADMADescr *dscr)
     hwaddr entry_addr = (hwaddr)s->admasysaddr;
     switch (SDHC_DMA_TYPE(s->hostctl)) {
     case SDHC_CTRL_ADMA2_32:
-        dma_memory_read(&dma_context_memory, entry_addr, (uint8_t *)&adma2,
+        dma_memory_read(&address_space_memory, entry_addr, (uint8_t *)&adma2,
                         sizeof(adma2));
         adma2 = le64_to_cpu(adma2);
         /* The spec does not specify endianness of descriptor table.
@@ -600,7 +600,7 @@ static void get_adma_description(SDHCIState *s, ADMADescr *dscr)
         dscr->incr = 8;
         break;
     case SDHC_CTRL_ADMA1_32:
-        dma_memory_read(&dma_context_memory, entry_addr, (uint8_t *)&adma1,
+        dma_memory_read(&address_space_memory, entry_addr, (uint8_t *)&adma1,
                         sizeof(adma1));
         adma1 = le32_to_cpu(adma1);
         dscr->addr = (hwaddr)(adma1 & 0xFFFFF000);
@@ -613,12 +613,12 @@ static void get_adma_description(SDHCIState *s, ADMADescr *dscr)
         }
         break;
     case SDHC_CTRL_ADMA2_64:
-        dma_memory_read(&dma_context_memory, entry_addr,
+        dma_memory_read(&address_space_memory, entry_addr,
                         (uint8_t *)(&dscr->attr), 1);
-        dma_memory_read(&dma_context_memory, entry_addr + 2,
+        dma_memory_read(&address_space_memory, entry_addr + 2,
                         (uint8_t *)(&dscr->length), 2);
         dscr->length = le16_to_cpu(dscr->length);
-        dma_memory_read(&dma_context_memory, entry_addr + 4,
+        dma_memory_read(&address_space_memory, entry_addr + 4,
                         (uint8_t *)(&dscr->addr), 8);
         dscr->attr = le64_to_cpu(dscr->attr);
         dscr->attr &= 0xfffffff8;
@@ -678,7 +678,7 @@ static void sdhci_do_adma(SDHCIState *s)
                         s->data_count = block_size;
                         length -= block_size - begin;
                     }
-                    dma_memory_write(&dma_context_memory, dscr.addr,
+                    dma_memory_write(&address_space_memory, dscr.addr,
                                      &s->fifo_buffer[begin],
                                      s->data_count - begin);
                     dscr.addr += s->data_count - begin;
@@ -702,7 +702,7 @@ static void sdhci_do_adma(SDHCIState *s)
                         s->data_count = block_size;
                         length -= block_size - begin;
                     }
-                    dma_memory_read(&dma_context_memory, dscr.addr,
+                    dma_memory_read(&address_space_memory, dscr.addr,
                                     &s->fifo_buffer[begin], s->data_count);
                     dscr.addr += s->data_count - begin;
                     if (s->data_count == block_size) {
diff --git a/hw/usb/hcd-ehci-pci.c b/hw/usb/hcd-ehci-pci.c
index 0eb7826..f1b5f5d 100644
--- a/hw/usb/hcd-ehci-pci.c
+++ b/hw/usb/hcd-ehci-pci.c
@@ -63,7 +63,7 @@ static int usb_ehci_pci_initfn(PCIDevice *dev)
     s->caps[0x09] = 0x68;        /* EECP */
 
     s->irq = dev->irq[3];
-    s->dma = pci_dma_context(dev);
+    s->as = pci_get_address_space(dev);
 
     s->capsbase = 0x00;
     s->opregbase = 0x20;
@@ -86,7 +86,7 @@ static void usb_ehci_pci_write_config(PCIDevice *dev, uint32_t addr,
         return;
     }
     busmaster = pci_get_word(dev->config + PCI_COMMAND) & PCI_COMMAND_MASTER;
-    i->ehci.dma = busmaster ? pci_dma_context(dev) : NULL;
+    i->ehci.as = busmaster ? pci_get_address_space(dev) : &address_space_memory;
 }
 
 static Property ehci_pci_properties[] = {
diff --git a/hw/usb/hcd-ehci-sysbus.c b/hw/usb/hcd-ehci-sysbus.c
index b68a66a..f9e4fd3 100644
--- a/hw/usb/hcd-ehci-sysbus.c
+++ b/hw/usb/hcd-ehci-sysbus.c
@@ -40,7 +40,7 @@ static int usb_ehci_sysbus_initfn(SysBusDevice *dev)
 
     s->capsbase = sec->capsbase;
     s->opregbase = sec->opregbase;
-    s->dma = &dma_context_memory;
+    s->as = &address_space_memory;
 
     usb_ehci_initfn(s, DEVICE(dev));
     sysbus_init_irq(dev, &s->irq);
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 0d3799d..1ad2159 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -446,7 +446,7 @@ static inline int get_dwords(EHCIState *ehci, uint32_t addr,
 {
     int i;
 
-    if (!ehci->dma) {
+    if (!ehci->as) {
         ehci_raise_irq(ehci, USBSTS_HSE);
         ehci->usbcmd &= ~USBCMD_RUNSTOP;
         trace_usb_ehci_dma_error();
@@ -454,7 +454,7 @@ static inline int get_dwords(EHCIState *ehci, uint32_t addr,
     }
 
     for (i = 0; i < num; i++, buf++, addr += sizeof(*buf)) {
-        dma_memory_read(ehci->dma, addr, buf, sizeof(*buf));
+        dma_memory_read(ehci->as, addr, buf, sizeof(*buf));
         *buf = le32_to_cpu(*buf);
     }
 
@@ -467,7 +467,7 @@ static inline int put_dwords(EHCIState *ehci, uint32_t addr,
 {
     int i;
 
-    if (!ehci->dma) {
+    if (!ehci->as) {
         ehci_raise_irq(ehci, USBSTS_HSE);
         ehci->usbcmd &= ~USBCMD_RUNSTOP;
         trace_usb_ehci_dma_error();
@@ -476,7 +476,7 @@ static inline int put_dwords(EHCIState *ehci, uint32_t addr,
 
     for (i = 0; i < num; i++, buf++, addr += sizeof(*buf)) {
         uint32_t tmp = cpu_to_le32(*buf);
-        dma_memory_write(ehci->dma, addr, &tmp, sizeof(tmp));
+        dma_memory_write(ehci->as, addr, &tmp, sizeof(tmp));
     }
 
     return num;
@@ -1245,7 +1245,7 @@ static int ehci_init_transfer(EHCIPacket *p)
     cpage  = get_field(p->qtd.token, QTD_TOKEN_CPAGE);
     bytes  = get_field(p->qtd.token, QTD_TOKEN_TBYTES);
     offset = p->qtd.bufptr[0] & ~QTD_BUFPTR_MASK;
-    qemu_sglist_init(&p->sgl, 5, p->queue->ehci->dma);
+    qemu_sglist_init(&p->sgl, 5, p->queue->ehci->as);
 
     while (bytes > 0) {
         if (cpage > 4) {
@@ -1484,7 +1484,7 @@ static int ehci_process_itd(EHCIState *ehci,
                 return -1;
             }
 
-            qemu_sglist_init(&ehci->isgl, 2, ehci->dma);
+            qemu_sglist_init(&ehci->isgl, 2, ehci->as);
             if (off + len > 4096) {
                 /* transfer crosses page border */
                 uint32_t len2 = off + len - 4096;
diff --git a/hw/usb/hcd-ehci.h b/hw/usb/hcd-ehci.h
index e95bb7e..2fcb92f 100644
--- a/hw/usb/hcd-ehci.h
+++ b/hw/usb/hcd-ehci.h
@@ -261,7 +261,7 @@ struct EHCIState {
     USBBus bus;
     qemu_irq irq;
     MemoryRegion mem;
-    DMAContext *dma;
+    AddressSpace *as;
     MemoryRegion mem_caps;
     MemoryRegion mem_opreg;
     MemoryRegion mem_ports;
diff --git a/hw/usb/hcd-ohci.c b/hw/usb/hcd-ohci.c
index 51241cd..5513924 100644
--- a/hw/usb/hcd-ohci.c
+++ b/hw/usb/hcd-ohci.c
@@ -62,7 +62,7 @@ typedef struct {
     USBBus bus;
     qemu_irq irq;
     MemoryRegion mem;
-    DMAContext *dma;
+    AddressSpace *as;
     int num_ports;
     const char *name;
 
@@ -508,7 +508,7 @@ static inline int get_dwords(OHCIState *ohci,
     addr += ohci->localmem_base;
 
     for (i = 0; i < num; i++, buf++, addr += sizeof(*buf)) {
-        dma_memory_read(ohci->dma, addr, buf, sizeof(*buf));
+        dma_memory_read(ohci->as, addr, buf, sizeof(*buf));
         *buf = le32_to_cpu(*buf);
     }
 
@@ -525,7 +525,7 @@ static inline int put_dwords(OHCIState *ohci,
 
     for (i = 0; i < num; i++, buf++, addr += sizeof(*buf)) {
         uint32_t tmp = cpu_to_le32(*buf);
-        dma_memory_write(ohci->dma, addr, &tmp, sizeof(tmp));
+        dma_memory_write(ohci->as, addr, &tmp, sizeof(tmp));
     }
 
     return 1;
@@ -540,7 +540,7 @@ static inline int get_words(OHCIState *ohci,
     addr += ohci->localmem_base;
 
     for (i = 0; i < num; i++, buf++, addr += sizeof(*buf)) {
-        dma_memory_read(ohci->dma, addr, buf, sizeof(*buf));
+        dma_memory_read(ohci->as, addr, buf, sizeof(*buf));
         *buf = le16_to_cpu(*buf);
     }
 
@@ -557,7 +557,7 @@ static inline int put_words(OHCIState *ohci,
 
     for (i = 0; i < num; i++, buf++, addr += sizeof(*buf)) {
         uint16_t tmp = cpu_to_le16(*buf);
-        dma_memory_write(ohci->dma, addr, &tmp, sizeof(tmp));
+        dma_memory_write(ohci->as, addr, &tmp, sizeof(tmp));
     }
 
     return 1;
@@ -585,7 +585,7 @@ static inline int ohci_read_iso_td(OHCIState *ohci,
 static inline int ohci_read_hcca(OHCIState *ohci,
                                  dma_addr_t addr, struct ohci_hcca *hcca)
 {
-    dma_memory_read(ohci->dma, addr + ohci->localmem_base, hcca, sizeof(*hcca));
+    dma_memory_read(ohci->as, addr + ohci->localmem_base, hcca, sizeof(*hcca));
     return 1;
 }
 
@@ -617,7 +617,7 @@ static inline int ohci_put_iso_td(OHCIState *ohci,
 static inline int ohci_put_hcca(OHCIState *ohci,
                                 dma_addr_t addr, struct ohci_hcca *hcca)
 {
-    dma_memory_write(ohci->dma,
+    dma_memory_write(ohci->as,
                      addr + ohci->localmem_base + HCCA_WRITEBACK_OFFSET,
                      (char *)hcca + HCCA_WRITEBACK_OFFSET,
                      HCCA_WRITEBACK_SIZE);
@@ -634,12 +634,12 @@ static void ohci_copy_td(OHCIState *ohci, struct ohci_td *td,
     n = 0x1000 - (ptr & 0xfff);
     if (n > len)
         n = len;
-    dma_memory_rw(ohci->dma, ptr + ohci->localmem_base, buf, n, dir);
+    dma_memory_rw(ohci->as, ptr + ohci->localmem_base, buf, n, dir);
     if (n == len)
         return;
     ptr = td->be & ~0xfffu;
     buf += n;
-    dma_memory_rw(ohci->dma, ptr + ohci->localmem_base, buf, len - n, dir);
+    dma_memory_rw(ohci->as, ptr + ohci->localmem_base, buf, len - n, dir);
 }
 
 /* Read/Write the contents of an ISO TD from/to main memory.  */
@@ -653,12 +653,12 @@ static void ohci_copy_iso_td(OHCIState *ohci,
     n = 0x1000 - (ptr & 0xfff);
     if (n > len)
         n = len;
-    dma_memory_rw(ohci->dma, ptr + ohci->localmem_base, buf, n, dir);
+    dma_memory_rw(ohci->as, ptr + ohci->localmem_base, buf, n, dir);
     if (n == len)
         return;
     ptr = end_addr & ~0xfffu;
     buf += n;
-    dma_memory_rw(ohci->dma, ptr + ohci->localmem_base, buf, len - n, dir);
+    dma_memory_rw(ohci->as, ptr + ohci->localmem_base, buf, len - n, dir);
 }
 
 static void ohci_process_lists(OHCIState *ohci, int completion);
@@ -1788,11 +1788,11 @@ static USBBusOps ohci_bus_ops = {
 static int usb_ohci_init(OHCIState *ohci, DeviceState *dev,
                          int num_ports, dma_addr_t localmem_base,
                          char *masterbus, uint32_t firstport,
-                         DMAContext *dma)
+                         AddressSpace *as)
 {
     int i;
 
-    ohci->dma = dma;
+    ohci->as = as;
 
     if (usb_frame_time == 0) {
 #ifdef OHCI_TIME_WARP
@@ -1859,7 +1859,7 @@ static int usb_ohci_initfn_pci(struct PCIDevice *dev)
 
     if (usb_ohci_init(&ohci->state, &dev->qdev, ohci->num_ports, 0,
                       ohci->masterbus, ohci->firstport,
-                      pci_dma_context(dev)) != 0) {
+                      pci_get_address_space(dev)) != 0) {
         return -1;
     }
     ohci->state.irq = ohci->pci_dev.irq[0];
@@ -1882,7 +1882,7 @@ static int ohci_init_pxa(SysBusDevice *dev)
 
     /* Cannot fail as we pass NULL for masterbus */
     usb_ohci_init(&s->ohci, &dev->qdev, s->num_ports, s->dma_offset, NULL, 0,
-                  &dma_context_memory);
+                  &address_space_memory);
     sysbus_init_irq(dev, &s->ohci.irq);
     sysbus_init_mmio(dev, &s->ohci.mem);
 
diff --git a/hw/usb/libhw.c b/hw/usb/libhw.c
index d2d4b51..8df11c4 100644
--- a/hw/usb/libhw.c
+++ b/hw/usb/libhw.c
@@ -37,7 +37,7 @@ int usb_packet_map(USBPacket *p, QEMUSGList *sgl)
 
         while (len) {
             dma_addr_t xlen = len;
-            mem = dma_memory_map(sgl->dma, base, &xlen, dir);
+            mem = dma_memory_map(sgl->as, base, &xlen, dir);
             if (!mem) {
                 goto err;
             }
@@ -63,7 +63,7 @@ void usb_packet_unmap(USBPacket *p, QEMUSGList *sgl)
     int i;
 
     for (i = 0; i < p->iov.niov; i++) {
-        dma_memory_unmap(sgl->dma, p->iov.iov[i].iov_base,
+        dma_memory_unmap(sgl->as, p->iov.iov[i].iov_base,
                          p->iov.iov[i].iov_len, dir,
                          p->iov.iov[i].iov_len);
     }
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 3a85bce..6ef1f97 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -242,7 +242,6 @@ struct PCIDevice {
     PCIIORegion io_regions[PCI_NUM_REGIONS];
     AddressSpace bus_master_as;
     MemoryRegion bus_master_enable_region;
-    DMAContext *dma;
 
     /* do not access the following fields */
     PCIConfigReadFunc *config_read;
@@ -639,15 +638,15 @@ static inline uint32_t pci_config_size(const PCIDevice *d)
 }
 
 /* DMA access functions */
-static inline DMAContext *pci_dma_context(PCIDevice *dev)
+static inline AddressSpace *pci_get_address_space(PCIDevice *dev)
 {
-    return dev->dma;
+    return &dev->bus_master_as;
 }
 
 static inline int pci_dma_rw(PCIDevice *dev, dma_addr_t addr,
                              void *buf, dma_addr_t len, DMADirection dir)
 {
-    dma_memory_rw(pci_dma_context(dev), addr, buf, len, dir);
+    dma_memory_rw(pci_get_address_space(dev), addr, buf, len, dir);
     return 0;
 }
 
@@ -667,12 +666,12 @@ static inline int pci_dma_write(PCIDevice *dev, dma_addr_t addr,
     static inline uint##_bits##_t ld##_l##_pci_dma(PCIDevice *dev,      \
                                                    dma_addr_t addr)     \
     {                                                                   \
-        return ld##_l##_dma(pci_dma_context(dev), addr);                \
+        return ld##_l##_dma(pci_get_address_space(dev), addr);          \
     }                                                                   \
     static inline void st##_s##_pci_dma(PCIDevice *dev,                 \
                                         dma_addr_t addr, uint##_bits##_t val) \
     {                                                                   \
-        st##_s##_dma(pci_dma_context(dev), addr, val);                  \
+        st##_s##_dma(pci_get_address_space(dev), addr, val);            \
     }
 
 PCI_DMA_DEFINE_LDST(ub, b, 8);
@@ -690,20 +689,20 @@ static inline void *pci_dma_map(PCIDevice *dev, dma_addr_t addr,
 {
     void *buf;
 
-    buf = dma_memory_map(pci_dma_context(dev), addr, plen, dir);
+    buf = dma_memory_map(pci_get_address_space(dev), addr, plen, dir);
     return buf;
 }
 
 static inline void pci_dma_unmap(PCIDevice *dev, void *buffer, dma_addr_t len,
                                  DMADirection dir, dma_addr_t access_len)
 {
-    dma_memory_unmap(pci_dma_context(dev), buffer, len, dir, access_len);
+    dma_memory_unmap(pci_get_address_space(dev), buffer, len, dir, access_len);
 }
 
 static inline void pci_dma_sglist_init(QEMUSGList *qsg, PCIDevice *dev,
                                        int alloc_hint)
 {
-    qemu_sglist_init(qsg, alloc_hint, pci_dma_context(dev));
+    qemu_sglist_init(qsg, alloc_hint, pci_get_address_space(dev));
 }
 
 extern const VMStateDescription vmstate_pci_device;
diff --git a/include/hw/ppc/spapr_vio.h b/include/hw/ppc/spapr_vio.h
index 2de58f1..3609327 100644
--- a/include/hw/ppc/spapr_vio.h
+++ b/include/hw/ppc/spapr_vio.h
@@ -64,7 +64,6 @@ struct VIOsPAPRDevice {
     target_ulong signal_state;
     VIOsPAPR_CRQ crq;
     AddressSpace as;
-    DMAContext dma;
     sPAPRTCETable *tcet;
 };
 
@@ -93,35 +92,35 @@ static inline qemu_irq spapr_vio_qirq(VIOsPAPRDevice *dev)
 static inline bool spapr_vio_dma_valid(VIOsPAPRDevice *dev, uint64_t taddr,
                                        uint32_t size, DMADirection dir)
 {
-    return dma_memory_valid(&dev->dma, taddr, size, dir);
+    return dma_memory_valid(&dev->as, taddr, size, dir);
 }
 
 static inline int spapr_vio_dma_read(VIOsPAPRDevice *dev, uint64_t taddr,
                                      void *buf, uint32_t size)
 {
-    return (dma_memory_read(&dev->dma, taddr, buf, size) != 0) ?
+    return (dma_memory_read(&dev->as, taddr, buf, size) != 0) ?
         H_DEST_PARM : H_SUCCESS;
 }
 
 static inline int spapr_vio_dma_write(VIOsPAPRDevice *dev, uint64_t taddr,
                                       const void *buf, uint32_t size)
 {
-    return (dma_memory_write(&dev->dma, taddr, buf, size) != 0) ?
+    return (dma_memory_write(&dev->as, taddr, buf, size) != 0) ?
         H_DEST_PARM : H_SUCCESS;
 }
 
 static inline int spapr_vio_dma_set(VIOsPAPRDevice *dev, uint64_t taddr,
                                     uint8_t c, uint32_t size)
 {
-    return (dma_memory_set(&dev->dma, taddr, c, size) != 0) ?
+    return (dma_memory_set(&dev->as, taddr, c, size) != 0) ?
         H_DEST_PARM : H_SUCCESS;
 }
 
-#define vio_stb(_dev, _addr, _val) (stb_dma(&(_dev)->dma, (_addr), (_val)))
-#define vio_sth(_dev, _addr, _val) (stw_be_dma(&(_dev)->dma, (_addr), (_val)))
-#define vio_stl(_dev, _addr, _val) (stl_be_dma(&(_dev)->dma, (_addr), (_val)))
-#define vio_stq(_dev, _addr, _val) (stq_be_dma(&(_dev)->dma, (_addr), (_val)))
-#define vio_ldq(_dev, _addr) (ldq_be_dma(&(_dev)->dma, (_addr)))
+#define vio_stb(_dev, _addr, _val) (stb_dma(&(_dev)->as, (_addr), (_val)))
+#define vio_sth(_dev, _addr, _val) (stw_be_dma(&(_dev)->as, (_addr), (_val)))
+#define vio_stl(_dev, _addr, _val) (stl_be_dma(&(_dev)->as, (_addr), (_val)))
+#define vio_stq(_dev, _addr, _val) (stq_be_dma(&(_dev)->as, (_addr), (_val)))
+#define vio_ldq(_dev, _addr) (ldq_be_dma(&(_dev)->as, (_addr)))
 
 int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq);
 
diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index 3317dcf..031d1f5 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -12,11 +12,11 @@
 
 #include <stdio.h>
 #include "exec/memory.h"
+#include "exec/address-spaces.h"
 #include "hw/hw.h"
 #include "block/block.h"
 #include "sysemu/kvm.h"
 
-typedef struct DMAContext DMAContext;
 typedef struct ScatterGatherEntry ScatterGatherEntry;
 
 typedef enum {
@@ -29,7 +29,7 @@ struct QEMUSGList {
     int nsg;
     int nalloc;
     size_t size;
-    DMAContext *dma;
+    AddressSpace *as;
 };
 
 #ifndef CONFIG_USER_ONLY
@@ -46,16 +46,7 @@ typedef uint64_t dma_addr_t;
 #define DMA_ADDR_BITS 64
 #define DMA_ADDR_FMT "%" PRIx64
 
-struct DMAContext {
-    AddressSpace *as;
-};
-
-/* A global DMA context corresponding to the address_space_memory
- * AddressSpace, for sysbus devices which do DMA.
- */
-extern DMAContext dma_context_memory;
-
-static inline void dma_barrier(DMAContext *dma, DMADirection dir)
+static inline void dma_barrier(AddressSpace *as, DMADirection dir)
 {
     /*
      * This is called before DMA read and write operations
@@ -83,105 +74,105 @@ static inline void dma_barrier(DMAContext *dma, DMADirection dir)
 /* Checks that the given range of addresses is valid for DMA.  This is
  * useful for certain cases, but usually you should just use
  * dma_memory_{read,write}() and check for errors */
-static inline bool dma_memory_valid(DMAContext *dma,
+static inline bool dma_memory_valid(AddressSpace *as,
                                     dma_addr_t addr, dma_addr_t len,
                                     DMADirection dir)
 {
-    return address_space_access_valid(dma->as, addr, len,
+    return address_space_access_valid(as, addr, len,
                                       dir == DMA_DIRECTION_FROM_DEVICE);
 }
 
-static inline int dma_memory_rw_relaxed(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_rw_relaxed(AddressSpace *as, dma_addr_t addr,
                                         void *buf, dma_addr_t len,
                                         DMADirection dir)
 {
-    return address_space_rw(dma->as, addr, buf, len, dir == DMA_DIRECTION_FROM_DEVICE);
+    return address_space_rw(as, addr, buf, len, dir == DMA_DIRECTION_FROM_DEVICE);
 }
 
-static inline int dma_memory_read_relaxed(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_read_relaxed(AddressSpace *as, dma_addr_t addr,
                                           void *buf, dma_addr_t len)
 {
-    return dma_memory_rw_relaxed(dma, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
+    return dma_memory_rw_relaxed(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
 }
 
-static inline int dma_memory_write_relaxed(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_write_relaxed(AddressSpace *as, dma_addr_t addr,
                                            const void *buf, dma_addr_t len)
 {
-    return dma_memory_rw_relaxed(dma, addr, (void *)buf, len,
+    return dma_memory_rw_relaxed(as, addr, (void *)buf, len,
                                  DMA_DIRECTION_FROM_DEVICE);
 }
 
-static inline int dma_memory_rw(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_rw(AddressSpace *as, dma_addr_t addr,
                                 void *buf, dma_addr_t len,
                                 DMADirection dir)
 {
-    dma_barrier(dma, dir);
+    dma_barrier(as, dir);
 
-    return dma_memory_rw_relaxed(dma, addr, buf, len, dir);
+    return dma_memory_rw_relaxed(as, addr, buf, len, dir);
 }
 
-static inline int dma_memory_read(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_read(AddressSpace *as, dma_addr_t addr,
                                   void *buf, dma_addr_t len)
 {
-    return dma_memory_rw(dma, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
+    return dma_memory_rw(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
 }
 
-static inline int dma_memory_write(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_write(AddressSpace *as, dma_addr_t addr,
                                    const void *buf, dma_addr_t len)
 {
-    return dma_memory_rw(dma, addr, (void *)buf, len,
+    return dma_memory_rw(as, addr, (void *)buf, len,
                          DMA_DIRECTION_FROM_DEVICE);
 }
 
-int dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c, dma_addr_t len);
+int dma_memory_set(AddressSpace *as, dma_addr_t addr, uint8_t c, dma_addr_t len);
 
-static inline void *dma_memory_map(DMAContext *dma,
+static inline void *dma_memory_map(AddressSpace *as,
                                    dma_addr_t addr, dma_addr_t *len,
                                    DMADirection dir)
 {
     hwaddr xlen = *len;
     void *p;
 
-    p = address_space_map(dma->as, addr, &xlen, dir == DMA_DIRECTION_FROM_DEVICE);
+    p = address_space_map(as, addr, &xlen, dir == DMA_DIRECTION_FROM_DEVICE);
     *len = xlen;
     return p;
 }
 
-static inline void dma_memory_unmap(DMAContext *dma,
+static inline void dma_memory_unmap(AddressSpace *as,
                                     void *buffer, dma_addr_t len,
                                     DMADirection dir, dma_addr_t access_len)
 {
-    address_space_unmap(dma->as, buffer, (hwaddr)len,
+    address_space_unmap(as, buffer, (hwaddr)len,
                         dir == DMA_DIRECTION_FROM_DEVICE, access_len);
 }
 
 #define DEFINE_LDST_DMA(_lname, _sname, _bits, _end) \
-    static inline uint##_bits##_t ld##_lname##_##_end##_dma(DMAContext *dma, \
+    static inline uint##_bits##_t ld##_lname##_##_end##_dma(AddressSpace *as, \
                                                             dma_addr_t addr) \
     {                                                                   \
         uint##_bits##_t val;                                            \
-        dma_memory_read(dma, addr, &val, (_bits) / 8);                  \
+        dma_memory_read(as, addr, &val, (_bits) / 8);                   \
         return _end##_bits##_to_cpu(val);                               \
     }                                                                   \
-    static inline void st##_sname##_##_end##_dma(DMAContext *dma,       \
+    static inline void st##_sname##_##_end##_dma(AddressSpace *as,      \
                                                  dma_addr_t addr,       \
                                                  uint##_bits##_t val)   \
     {                                                                   \
         val = cpu_to_##_end##_bits(val);                                \
-        dma_memory_write(dma, addr, &val, (_bits) / 8);                 \
+        dma_memory_write(as, addr, &val, (_bits) / 8);                  \
     }
 
-static inline uint8_t ldub_dma(DMAContext *dma, dma_addr_t addr)
+static inline uint8_t ldub_dma(AddressSpace *as, dma_addr_t addr)
 {
     uint8_t val;
 
-    dma_memory_read(dma, addr, &val, 1);
+    dma_memory_read(as, addr, &val, 1);
     return val;
 }
 
-static inline void stb_dma(DMAContext *dma, dma_addr_t addr, uint8_t val)
+static inline void stb_dma(AddressSpace *as, dma_addr_t addr, uint8_t val)
 {
-    dma_memory_write(dma, addr, &val, 1);
+    dma_memory_write(as, addr, &val, 1);
 }
 
 DEFINE_LDST_DMA(uw, w, 16, le);
@@ -193,14 +184,12 @@ DEFINE_LDST_DMA(q, q, 64, be);
 
 #undef DEFINE_LDST_DMA
 
-void dma_context_init(DMAContext *dma, AddressSpace *as);
-
 struct ScatterGatherEntry {
     dma_addr_t base;
     dma_addr_t len;
 };
 
-void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, DMAContext *dma);
+void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, AddressSpace *as);
 void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len);
 void qemu_sglist_destroy(QEMUSGList *qsg);
 #endif
