From: Yi Liu <yi.l.liu@intel.com>

pci_device_[set|unset]_iommu_device() call pci_device_get_iommu_bus_devfn()
to get iommu_bus->iommu_ops and call [set|unset]_iommu_device callback to
set/unset HostIOMMUDevice for a given PCI device.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/hw/pci/pci.h | 38 +++++++++++++++++++++++++++++++++++++-
 hw/pci/pci.c         | 27 +++++++++++++++++++++++++++
 2 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index eaa3fc99d8..c84cc9b99a 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -3,6 +3,7 @@
 
 #include "exec/memory.h"
 #include "sysemu/dma.h"
+#include "sysemu/host_iommu_device.h"
 
 /* PCI includes legacy ISA access.  */
 #include "hw/isa/isa.h"
@@ -383,10 +384,45 @@ typedef struct PCIIOMMUOps {
      *
      * @devfn: device and function number
      */
-   AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int devfn);
+    AddressSpace * (*get_address_space)(PCIBus *bus, void *opaque, int devfn);
+    /**
+     * @set_iommu_device: attach a HostIOMMUDevice to a vIOMMU
+     *
+     * Optional callback, if not implemented in vIOMMU, then vIOMMU can't
+     * retrieve host information from the associated HostIOMMUDevice.
+     *
+     * @bus: the #PCIBus of the PCI device.
+     *
+     * @opaque: the data passed to pci_setup_iommu().
+     *
+     * @devfn: device and function number of the PCI device.
+     *
+     * @dev: the data structure representing host IOMMU device.
+     *
+     * @errp: pass an Error out only when return false
+     *
+     * Returns: true if HostIOMMUDevice is attached or else false with errp set.
+     */
+    bool (*set_iommu_device)(PCIBus *bus, void *opaque, int devfn,
+                             HostIOMMUDevice *dev, Error **errp);
+    /**
+     * @unset_iommu_device: detach a HostIOMMUDevice from a vIOMMU
+     *
+     * Optional callback.
+     *
+     * @bus: the #PCIBus of the PCI device.
+     *
+     * @opaque: the data passed to pci_setup_iommu().
+     *
+     * @devfn: device and function number of the PCI device.
+     */
+    void (*unset_iommu_device)(PCIBus *bus, void *opaque, int devfn);
 } PCIIOMMUOps;
 
 AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
+bool pci_device_set_iommu_device(PCIDevice *dev, HostIOMMUDevice *hiod,
+                                 Error **errp);
+void pci_device_unset_iommu_device(PCIDevice *dev);
 
 /**
  * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 02a4bb2af6..c8a8aab306 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2742,6 +2742,33 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
     return &address_space_memory;
 }
 
+bool pci_device_set_iommu_device(PCIDevice *dev, HostIOMMUDevice *hiod,
+                                 Error **errp)
+{
+    PCIBus *iommu_bus;
+
+    /* set_iommu_device requires device's direct BDF instead of aliased BDF */
+    pci_device_get_iommu_bus_devfn(dev, &iommu_bus, NULL, NULL);
+    if (iommu_bus && iommu_bus->iommu_ops->set_iommu_device) {
+        return iommu_bus->iommu_ops->set_iommu_device(pci_get_bus(dev),
+                                                      iommu_bus->iommu_opaque,
+                                                      dev->devfn, hiod, errp);
+    }
+    return true;
+}
+
+void pci_device_unset_iommu_device(PCIDevice *dev)
+{
+    PCIBus *iommu_bus;
+
+    pci_device_get_iommu_bus_devfn(dev, &iommu_bus, NULL, NULL);
+    if (iommu_bus && iommu_bus->iommu_ops->unset_iommu_device) {
+        return iommu_bus->iommu_ops->unset_iommu_device(pci_get_bus(dev),
+                                                        iommu_bus->iommu_opaque,
+                                                        dev->devfn);
+    }
+}
+
 void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *ops, void *opaque)
 {
     /*
-- 
2.34.1