[Qemu-devel] [PATCH 09/12] vfio: vote the function 0 to do host bus reset when aer occurred

[Zhou Jie <zhoujie2011@cn.fujitsu.com>]

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

Due to all devices assigned to VM on the same way as host if enable
aer, so we can easily do the hot reset by selecting the function #0
to do the hot reset.

Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
---
 hw/vfio/pci.c | 14 ++++++++++++++
 hw/vfio/pci.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 109b11b..47fd407 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -1948,6 +1948,8 @@ static void vfio_check_hot_bus_reset(VFIOPCIDevice *vdev, Error **errp)
     /* 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;
@@ -3058,6 +3060,18 @@ static void vfio_pci_reset(DeviceState *dev)
 
     trace_vfio_pci_reset(vdev->vbasedev.name);
 
+    if (vdev->features & VFIO_FEATURE_ENABLE_AER) {
+        PCIDevice *br = pci_bridge_get_device(pdev->bus);
+
+        if ((pci_get_word(br->config + PCI_BRIDGE_CONTROL) &
+             PCI_BRIDGE_CTL_BUS_RESET)) {
+            if (pci_get_function_0(pdev) == pdev) {
+                vfio_pci_hot_reset(vdev, vdev->single_depend_dev);
+            }
+            return;
+        }
+    }
+
     vfio_pci_pre_reset(vdev);
 
     if (vdev->resetfn && !vdev->resetfn(vdev)) {
diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index db7c6d5..9fb0206 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -143,6 +143,7 @@ typedef struct VFIOPCIDevice {
     bool no_kvm_intx;
     bool no_kvm_msi;
     bool no_kvm_msix;
+    bool single_depend_dev;
 } VFIOPCIDevice;
 
 uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len);
-- 
1.8.3.1