Re: [PATCH 0/4] Fix broken PCIe device after migration

[Gerd Hoffmann]

  Hi,

> Well the control is present, isn't it? Can be used to e.g. reset the
> device behind the bridge.

Well, not right now b/c poweroff ejects the device.  Would need a patch
like this ...

--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -755,7 +755,8 @@ void pcie_cap_slot_write_config(PCIDevice *dev,
     if ((sltsta & PCI_EXP_SLTSTA_PDS) && (val & PCI_EXP_SLTCTL_PCC) &&
         (val & PCI_EXP_SLTCTL_PIC_OFF) == PCI_EXP_SLTCTL_PIC_OFF &&
         (!(old_slt_ctl & PCI_EXP_SLTCTL_PCC) ||
-        (old_slt_ctl & PCI_EXP_SLTCTL_PIC_OFF) != PCI_EXP_SLTCTL_PIC_OFF)) {
+        (old_slt_ctl & PCI_EXP_SLTCTL_PIC_OFF) != PCI_EXP_SLTCTL_PIC_OFF) &&
+        dev->pending_deleted_event) {
         pcie_cap_slot_do_unplug(dev);
     }
     pcie_cap_update_power(dev);

... so pcie unplugs on poweroff only in case there is a pending unplug
request.  But with that the guest wouldn't be able to unplug devices on
its own.

take care,
  Gerd