[Qemu-devel] [v15 11/15] vfio: add hot reset callback

[Cao jin]

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

For Vfio device, Once need to recovery devices by bus reset such as AER,
we always need to reset the host bus to recovery the devices under the bus,
so we need to specify to do host bus reset.
---
 hw/vfio/pci.c | 15 +++++++++++++++
 hw/vfio/pci.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index ff25c9b..ee88db3 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -1914,6 +1914,8 @@ static int vfio_check_host_bus_reset(VFIOPCIDevice *vdev)
     /* List all affected devices by bus reset */
     devices = &info->devices[0];
 
+    vdev->single_depend_dev = (info->count == 1);
+
     /* Verify that we have all the groups required */
     for (i = 0; i < info->count; i++) {
         PCIHostDeviceAddress host;
@@ -3035,6 +3037,18 @@ post_reset:
     vfio_pci_post_reset(vdev);
 }
 
+static void vfio_pci_device_hot_reset(DeviceState *dev)
+{
+    PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev);
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+
+    if (vdev->features & VFIO_FEATURE_ENABLE_AER) {
+        vfio_pci_hot_reset(vdev, vdev->single_depend_dev);
+    } else {
+        vfio_pci_reset(dev);
+    }
+}
+
 static void vfio_instance_init(Object *obj)
 {
     PCIDevice *pci_dev = PCI_DEVICE(obj);
@@ -3082,6 +3096,7 @@ static void vfio_pci_dev_class_init(ObjectClass *klass, 
void *data)
     PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
 
     dc->reset = vfio_pci_reset;
+    dc->hot_reset = vfio_pci_device_hot_reset;
     dc->props = vfio_pci_dev_properties;
     dc->vmsd = &vfio_pci_vmstate;
     dc->desc = "VFIO-based PCI device assignment";
diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index b385f07..6186e62 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -142,6 +142,7 @@ typedef struct VFIOPCIDevice {
     bool no_kvm_intx;
     bool no_kvm_msi;
     bool no_kvm_msix;
+    bool single_depend_dev;
 
     NotifierWithReturn hotplug_notifier;
 } VFIOPCIDevice;
-- 
1.9.3