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Re: [Qemu-devel] [PATCH v16 02/14] vfio: squeeze out vfio_pci_do_hot_res


From: Marcel Apfelbaum
Subject: Re: [Qemu-devel] [PATCH v16 02/14] vfio: squeeze out vfio_pci_do_hot_reset for support bus reset
Date: Sun, 17 Jan 2016 15:01:02 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

On 01/12/2016 04:43 AM, Cao jin wrote:
From: Chen Fan <address@hidden>

squeeze out vfio_pci_do_hot_reset to do host bus reset when AER recovery.

Signed-off-by: Chen Fan <address@hidden>
---
  hw/vfio/pci.c | 75 +++++++++++++++++++++++++++++++++++------------------------
  1 file changed, 44 insertions(+), 31 deletions(-)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index efcd3cd..a63cf85 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -1699,6 +1699,48 @@ error:
      return ret;
  }

+static int vfio_pci_do_hot_reset(VFIOPCIDevice *vdev,
+                                 struct vfio_pci_hot_reset_info *info)
+{
+    VFIOGroup *group;
+    struct vfio_pci_hot_reset *reset;
+    int32_t *fds;
+    int ret, i, count;
+    struct vfio_pci_dependent_device *devices;
+
+    /* Determine how many group fds need to be passed */
+    count = 0;
+    devices = &info->devices[0];
+    QLIST_FOREACH(group, &vfio_group_list, next) {
+        for (i = 0; i < info->count; i++) {
+            if (group->groupid == devices[i].group_id) {
+                count++;
+                break;
+            }
+        }
+    }
+
+    reset = g_malloc0(sizeof(*reset) + (count * sizeof(*fds)));
+    reset->argsz = sizeof(*reset) + (count * sizeof(*fds));
+    fds = &reset->group_fds[0];
+
+    /* Fill in group fds */
+    QLIST_FOREACH(group, &vfio_group_list, next) {
+        for (i = 0; i < info->count; i++) {
+            if (group->groupid == devices[i].group_id) {
+                fds[reset->count++] = group->fd;
+                break;
+            }
+        }
+    }
+
+    /* Bus reset! */
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_PCI_HOT_RESET, reset);
+    g_free(reset);
+
+    return ret;
+}
+
  static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos)
  {
      PCIDevice *pdev = &vdev->pdev;
@@ -1840,9 +1882,7 @@ static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool 
single)
      VFIOGroup *group;
      struct vfio_pci_hot_reset_info *info = NULL;
      struct vfio_pci_dependent_device *devices;
-    struct vfio_pci_hot_reset *reset;
-    int32_t *fds;
-    int ret, i, count;
+    int ret, i;
      bool multi = false;

      trace_vfio_pci_hot_reset(vdev->vbasedev.name, single ? "one" : "multi");
@@ -1921,34 +1961,7 @@ static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool 
single)
          goto out_single;
      }

-    /* Determine how many group fds need to be passed */
-    count = 0;
-    QLIST_FOREACH(group, &vfio_group_list, next) {
-        for (i = 0; i < info->count; i++) {
-            if (group->groupid == devices[i].group_id) {
-                count++;
-                break;
-            }
-        }
-    }
-
-    reset = g_malloc0(sizeof(*reset) + (count * sizeof(*fds)));
-    reset->argsz = sizeof(*reset) + (count * sizeof(*fds));
-    fds = &reset->group_fds[0];
-
-    /* Fill in group fds */
-    QLIST_FOREACH(group, &vfio_group_list, next) {
-        for (i = 0; i < info->count; i++) {
-            if (group->groupid == devices[i].group_id) {
-                fds[reset->count++] = group->fd;
-                break;
-            }
-        }
-    }
-
-    /* Bus reset! */
-    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_PCI_HOT_RESET, reset);
-    g_free(reset);
+    ret = vfio_pci_do_hot_reset(vdev, info);

      trace_vfio_pci_hot_reset_result(vdev->vbasedev.name,
                                      ret ? "%m" : "Success");



The commit message may be improved, other than that it looks OK to me.

Reviewed-by: Marcel Apfelbaum <address@hidden>

Thanks,
Marcel



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