This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

This also allows to save/restore this field during migration.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         |  2 +-
 hw/s390x/s390-pci-inst.c        | 10 +++++-----
 include/hw/s390x/s390-pci-bus.h |  2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 4a0b31b98b..b784196c9e 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -616,7 +616,7 @@ static void s390_pci_ioat_replay(S390PCIBusDevice *pbdev)
     }
 
     while (curr < end) {
-        error = s390_guest_io_table_walk(iommu->g_iota, curr, &entry);
+        error = s390_guest_io_table_walk(pbdev->g_iota, curr, &entry);
         if (error) {
             error_report("Failure to walk table during iommu remap");
             return;
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index ac4e7f412d..f4ec299614 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -748,7 +748,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     } else {
         dma_avail = 1;
     }
-    if (!iommu->g_iota) {
+    if (!pbdev->g_iota) {
         error = ERR_EVENT_INVALAS;
         goto err;
     }
@@ -762,7 +762,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     start = sstart;
     again = false;
     while (start < end) {
-        error = s390_guest_io_table_walk(iommu->g_iota, start, &entry);
+        error = s390_guest_io_table_walk(pbdev->g_iota, start, &entry);
         if (error) {
             break;
         }
@@ -1028,7 +1028,7 @@ static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
 
     iommu->pba = pba;
     iommu->pal = pal;
-    iommu->g_iota = g_iota;
+    pbdev->g_iota = g_iota;
 
     if (t) {
         s390_pci_iommu_enable(pbdev);
@@ -1045,7 +1045,7 @@ void pci_dereg_ioat(S390PCIBusDevice *pbdev)
     s390_pci_iommu_disable(pbdev);
     iommu->pba = 0;
     iommu->pal = 0;
-    iommu->g_iota = 0;
+    pbdev->g_iota = 0;
 }
 
 void fmb_timer_free(S390PCIBusDevice *pbdev)
@@ -1418,7 +1418,7 @@ int stpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
 
     stq_be_p(&fib.pba, pbdev->iommu->pba);
     stq_be_p(&fib.pal, pbdev->iommu->pal);
-    stq_be_p(&fib.iota, pbdev->iommu->g_iota);
+    stq_be_p(&fib.iota, pbdev->g_iota);
     stq_be_p(&fib.aibv, pbdev->routes.adapter.ind_addr);
     stq_be_p(&fib.aisb, pbdev->routes.adapter.summary_addr);
     stq_be_p(&fib.fmb_addr, pbdev->fmb_addr);
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index 126a50c98b..a7d1f1ade2 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -275,7 +275,6 @@ struct S390PCIIOMMU {
     Object parent_obj;
     AddressSpace as;
     MemoryRegion mr;
-    uint64_t g_iota;
     uint64_t pba;
     uint64_t pal;
     uint64_t max_dma_limit;
@@ -352,6 +351,7 @@ struct S390PCIBusDevice {
     IOMMUMemoryRegion iommu_mr;
     MemoryRegion *dm_mr;
     GHashTable *iotlb;
+    uint64_t g_iota;
     S390PCIDMACount *dma_limit;
     MemoryRegion msix_notify_mr;
     IndAddr *summary_ind;
-- 
2.34.1