This patch adds pci_device_host_iommu_context() to expose HostIOMMUContext
to vIOMMU emulators via pci layer.

Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Eric Auger <eric.auger@redhat.com>
Cc: Yi Sun <yi.y.sun@linux.intel.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
---
 hw/pci/pci.c         | 8 ++++++++
 include/hw/pci/pci.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 3166cc3..288576f 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2689,6 +2689,14 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
     return &address_space_memory;
 }
 
+HostIOMMUContext *pci_device_host_iommu_context(PCIDevice *dev)
+{
+    if (dev && dev->host_iommu_fn) {
+        return dev->host_iommu_fn(dev);
+    }
+    return NULL;
+}
+
 void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque)
 {
     bus->iommu_fn = fn;
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index e44eefb..cb514d0 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -494,6 +494,7 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
 void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque);
 void pci_device_setup_iommu(PCIDevice *dev, PCIHostIOMMUFunc fn);
 void pci_device_unset_iommu(PCIDevice *dev);
+HostIOMMUContext *pci_device_host_iommu_context(PCIDevice *dev);
 
 static inline void
 pci_set_byte(uint8_t *config, uint8_t val)
-- 
2.7.4