[Qemu-devel] [RFC v8.1 09/13] vfio: add sec_bus_reset notifier to notify physical bus reset is needed

[Chen Fan]

Signed-off-by: Chen Fan <address@hidden>
---
 hw/vfio/pci.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 91ad9ad..a8c5988 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -156,6 +156,7 @@ typedef struct VFIOPCIDevice {
     PCIHostDeviceAddress host;
     EventNotifier err_notifier;
     EventNotifier req_notifier;
+    Notifier sec_bus_reset_notifier;
     int (*resetfn)(struct VFIOPCIDevice *);
     uint32_t features;
 #define VFIO_FEATURE_ENABLE_VGA_BIT 0
@@ -172,6 +173,7 @@ typedef struct VFIOPCIDevice {
     bool has_flr;
     bool has_pm_reset;
     bool has_bus_reset;
+    bool needs_bus_reset;
     bool rom_read_failed;
 } VFIOPCIDevice;
 
@@ -3828,6 +3830,17 @@ static Notifier machine_notifier = {
     .notify = vfio_pci_machine_done_notify,
 };
 
+static void vfio_pci_host_needs_bus_reset(Notifier *n, void *opaque)
+{
+    VFIOPCIDevice *vdev = container_of(n, VFIOPCIDevice, 
sec_bus_reset_notifier);
+    VFIODevice *vbasedev = &vdev->vbasedev;
+
+    if (vdev->has_bus_reset) {
+        vdev->needs_bus_reset = true;
+        vbasedev->needs_reset = true;
+    }
+}
+
 static int vfio_initfn(PCIDevice *pdev)
 {
     VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
@@ -3978,6 +3991,9 @@ static int vfio_initfn(PCIDevice *pdev)
     vfio_register_req_notifier(vdev);
     vfio_setup_resetfn(vdev);
 
+    vdev->sec_bus_reset_notifier.notify = vfio_pci_host_needs_bus_reset;
+    pci_bus_add_reset_notifier(pdev->bus, &vdev->sec_bus_reset_notifier);
+
     return 0;
 
 out_teardown:
@@ -4006,6 +4022,7 @@ static void vfio_exitfn(PCIDevice *pdev)
 
     vfio_unregister_req_notifier(vdev);
     vfio_unregister_err_notifier(vdev);
+    pci_bus_remove_reset_notifier(&vdev->sec_bus_reset_notifier);
     pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
     vfio_disable_interrupts(vdev);
     if (vdev->intx.mmap_timer) {
-- 
1.9.3