[Qemu-devel] [PATCH v12 12/15] vfio: do hot bus reset when do virtual secondary bus reset

[Chen Hanxiao <chenhanxiao@cn.fujitsu.com>]

From: Chen Fan <chen.fan.fnst@cn.fujitsu.com>

when do virtual secondary bus reset, the vfio device under
this bus need to do host bus reset to reset the device.
so add this case.

Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
---
 hw/vfio/pci.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index c52456b..bd67608 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -4134,6 +4134,27 @@ static void vfio_exitfn(PCIDevice *pdev)
     vfio_unregister_bars(vdev);
 }
 
+static int vfio_pci_is_single_function(VFIOPCIDevice *vdev)
+{
+    struct vfio_pci_hot_reset_info *info = NULL;
+    int ret;
+
+    ret = vfio_get_hot_reset_info(vdev, &info);
+    if (ret) {
+        goto out;
+    }
+
+    if (info->count > 1) {
+        ret = 0;
+        goto out;
+    }
+
+    ret = 1;
+out:
+    g_free(info);
+    return ret;
+}
+
 static void vfio_pci_reset(DeviceState *dev)
 {
     PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev);
@@ -4141,6 +4162,16 @@ static void vfio_pci_reset(DeviceState *dev)
 
     trace_vfio_pci_reset(vdev->vbasedev.name);
 
+    if (vdev->needs_bus_reset) {
+        vdev->needs_bus_reset = false;
+        /* Avoid duplicate bus reset */
+        if (vdev->vbasedev.needs_reset) {
+            vfio_pci_hot_reset(vdev,
+                vfio_pci_is_single_function(vdev) ? true : false);
+        }
+        return;
+    }
+
     vfio_pci_pre_reset(vdev);
 
     if (vdev->resetfn && !vdev->resetfn(vdev)) {
-- 
2.1.0