[Qemu-devel] [PATCH v4 07/10] vfio: add check aer functionality for hotplug device

[Cao jin]

From: Chen Fan <address@hidden>

because we make the vfio functions are combined
in the same way as on the host for aer, so we can
do the aer check when the function 0 was hotplugged.

Signed-off-by: Chen Fan <address@hidden>
---
 hw/vfio/pci.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index dce3b6d..9902c87 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2030,6 +2030,35 @@ out:
     return;
 }
 
+static void vfio_bus_check_aer_functions(PCIDevice *pdev, Error **errp)
+{
+    VFIOPCIDevice *vdev;
+    PCIDevice *dev;
+    Error *local_err = NULL;
+    int devfn;
+
+    for (devfn = 0; devfn < 8; devfn++) {
+        dev = pci_find_device(pdev->bus, pci_bus_num(pdev->bus),
+                  PCI_DEVFN(PCI_SLOT(pdev->devfn), devfn));
+        if (!dev) {
+            continue;
+        }
+        if (!object_dynamic_cast(OBJECT(dev), "vfio-pci")) {
+            continue;
+        }
+        vdev = DO_UPCAST(VFIOPCIDevice, pdev, dev);
+        if (vdev->features & VFIO_FEATURE_ENABLE_AER) {
+            vfio_check_hot_bus_reset(vdev, &local_err);
+            if (local_err) {
+                error_propagate(errp, local_err);
+                return;
+            }
+        }
+    }
+
+    return;
+}
+
 static void vfio_aer_check_host_bus_reset(Error **errp)
 {
     VFIOGroup *group;
@@ -2982,6 +3011,22 @@ static int vfio_initfn(PCIDevice *pdev)
         }
     }
 
+    /*
+     *  If this function is func 0, indicate the closure of the slot.
+     *  we get the chance to check aer-enabled devices whether support
+     *  hot bus reset.
+     */
+    if (DEVICE(pdev)->hotplugged &&
+        pdev == pci_get_function_0(pdev)) {
+        Error *local_err = NULL;
+
+        vfio_bus_check_aer_functions(pdev, &local_err);
+        if (local_err) {
+            error_report_err(local_err);
+            goto out_teardown;
+        }
+    }
+
     vfio_register_err_notifier(vdev);
     vfio_register_req_notifier(vdev);
     vfio_setup_resetfn_quirk(vdev);
-- 
1.9.3