[RFC v1 15/18] vfio/pci: adds support for PASID-based iotlb flush

[Liu Yi L <yi.l.liu@xxxxxxxxx>]

This patch adds support for propagating guest PASID-based iotlb flush
to host via vfio container ioctl.

Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Eric Auger <eric.auger@xxxxxxxxxx>
Cc: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
Cc: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Liu Yi L <yi.l.liu@xxxxxxxxx>
---
 hw/vfio/pci.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 892b46c..d8b84a5 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2796,11 +2796,34 @@ static void vfio_pci_device_unbind_gpasid(PCIBus *bus, int32_t devfn,
     g_free(bind);
 }
 
+static void vfio_pci_device_flush_pasid_iotlb(PCIBus *bus, int32_t devfn,
+                                struct iommu_cache_invalidate_info *info)
+{
+    PCIDevice *pdev = bus->devices[devfn];
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+    VFIOContainer *container = vdev->vbasedev.group->container;
+    struct vfio_iommu_type1_cache_invalidate cache_inv;
+    unsigned long argsz;
+
+    argsz = sizeof(cache_inv);
+    cache_inv.argsz = argsz;
+    cache_inv.info = *info;
+    cache_inv.flags = 0x0;
+
+    rcu_read_lock();
+    if (ioctl(container->fd, VFIO_IOMMU_CACHE_INVALIDATE, &cache_inv) != 0) {
+        error_report("vfio_pci_device_flush_pasid_iotlb:"
+                     " cache invalidation failed, contanier: %p", container);
+    }
+    rcu_read_unlock();
+}
+
 static PCIPASIDOps vfio_pci_pasid_ops = {
     .alloc_pasid = vfio_pci_device_request_pasid_alloc,
     .free_pasid = vfio_pci_device_request_pasid_free,
     .bind_gpasid = vfio_pci_device_bind_gpasid,
     .unbind_gpasid = vfio_pci_device_unbind_gpasid,
+    .flush_pasid_iotlb = vfio_pci_device_flush_pasid_iotlb,
 };
 
 static void vfio_realize(PCIDevice *pdev, Error **errp)
-- 
2.7.4