memory/iommu: QOM'fy IOMMU MemoryRegion

This defines new QOM object - IOMMUMemoryRegion - with MemoryRegion
as a parent.

This moves IOMMU-related fields from MR to IOMMU MR. However to avoid
dymanic QOM casting in fast path (address_space_translate, etc),
this adds an @is_iommu boolean flag to MR and provides new helper to
do simple cast to IOMMU MR - memory_region_get_iommu. The flag
is set in the instance init callback. This defines
memory_region_is_iommu as memory_region_get_iommu()!=NULL.

This switches MemoryRegion to IOMMUMemoryRegion in most places except
the ones where MemoryRegion may be an alias.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20170711035620.4232-2-aik@ozlabs.ru>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 8bc7c98682..a53c29c487 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -563,7 +563,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
     S390PCIIOMMU *iommu;
     hwaddr start, end;
     IOMMUTLBEntry entry;
-    MemoryRegion *mr;
+    IOMMUMemoryRegion *iommu_mr;
 
     cpu_synchronize_state(CPU(cpu));
 
@@ -622,9 +622,9 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
         goto out;
     }
 
-    mr = &iommu->iommu_mr;
+    iommu_mr = &iommu->iommu_mr;
     while (start < end) {
-        entry = mr->iommu_ops->translate(mr, start, IOMMU_NONE);
+        entry = iommu_mr->iommu_ops->translate(iommu_mr, start, IOMMU_NONE);
 
         if (!entry.translated_addr) {
             pbdev->state = ZPCI_FS_ERROR;
@@ -635,7 +635,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2)
             goto out;
         }
 
-        memory_region_notify_iommu(mr, entry);
+        memory_region_notify_iommu(iommu_mr, entry);
         start += entry.addr_mask + 1;
     }