[Qemu-devel] [v15 12/15] vfio: add bus in reset flag

[Cao jin]

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

mark the host bus be in reset. avoid multiple devices trigger the
host bus reset many times.

Signed-off-by: Chen Fan <chen.fan.f...@cn.fujitsu.com>
---
 hw/vfio/pci.c                 | 6 ++++++
 include/hw/vfio/vfio-common.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index ee88db3..aa0d945 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2249,6 +2249,11 @@ static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool 
single)
 
     trace_vfio_pci_hot_reset(vdev->vbasedev.name, single ? "one" : "multi");
 
+    if (vdev->vbasedev.bus_in_reset) {
+        vdev->vbasedev.bus_in_reset = false;
+        return 0;
+    }
+
     vfio_pci_pre_reset(vdev);
     vdev->vbasedev.needs_reset = false;
 
@@ -2312,6 +2317,7 @@ static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool 
single)
                 }
                 vfio_pci_pre_reset(tmp);
                 tmp->vbasedev.needs_reset = false;
+                tmp->vbasedev.bus_in_reset = true;
                 multi = true;
                 break;
             }
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index f037f3c..44b19d7 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -95,6 +95,7 @@ typedef struct VFIODevice {
     bool reset_works;
     bool needs_reset;
     bool no_mmap;
+    bool bus_in_reset;
     VFIODeviceOps *ops;
     unsigned int num_irqs;
     unsigned int num_regions;
-- 
1.9.3