Pass an error object to prepare for migration to VFIO-PCI realize.
The returned value will be removed later on.

We now format an error in case of reading failure for
- the MSIX flags
- the MSIX table,
- the MSIX PBA.

Signed-off-by: Eric Auger <eric.au...@redhat.com>

---

v1 -> v2:
- this patch now comes before the actual realize migration
- mention in the commit message we are no more silent on above errors
---
 hw/vfio/pci.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 9fe970a..b35925a 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -1277,7 +1277,7 @@ static void vfio_pci_fixup_msix_region(VFIOPCIDevice 
*vdev)
  * need to first look for where the MSI-X table lives.  So we
  * unfortunately split MSI-X setup across two functions.
  */
-static int vfio_msix_early_setup(VFIOPCIDevice *vdev)
+static int vfio_msix_early_setup(VFIOPCIDevice *vdev, Error **errp)
 {
     uint8_t pos;
     uint16_t ctrl;
@@ -1292,16 +1292,19 @@ static int vfio_msix_early_setup(VFIOPCIDevice *vdev)
 
     if (pread(fd, &ctrl, sizeof(ctrl),
               vdev->config_offset + pos + PCI_MSIX_FLAGS) != sizeof(ctrl)) {
+        error_setg_errno(errp, errno, "failed to read PCI MSIX FLAGS");
         return -errno;
     }
 
     if (pread(fd, &table, sizeof(table),
               vdev->config_offset + pos + PCI_MSIX_TABLE) != sizeof(table)) {
+        error_setg_errno(errp, errno, "failed to read PCI MSIX TABLE");
         return -errno;
     }
 
     if (pread(fd, &pba, sizeof(pba),
               vdev->config_offset + pos + PCI_MSIX_PBA) != sizeof(pba)) {
+        error_setg_errno(errp, errno, "failed to read PCI MSIX PBA");
         return -errno;
     }
 
@@ -1332,8 +1335,8 @@ static int vfio_msix_early_setup(VFIOPCIDevice *vdev)
             (vdev->device_id & 0xff00) == 0x5800) {
             msix->pba_offset = 0x1000;
         } else {
-            error_report("vfio: Hardware reports invalid configuration, "
-                         "MSIX PBA outside of specified BAR");
+            error_setg(errp, "hardware reports invalid configuration, "
+                       "MSIX PBA outside of specified BAR");
             g_free(msix);
             return -EINVAL;
         }
@@ -2655,9 +2658,9 @@ static int vfio_initfn(PCIDevice *pdev)
 
     vfio_pci_size_rom(vdev);
 
-    ret = vfio_msix_early_setup(vdev);
-    if (ret) {
-        return ret;
+    ret = vfio_msix_early_setup(vdev, &err);
+    if (err) {
+        goto error;
     }
 
     vfio_bars_setup(vdev);
-- 
1.9.1


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