On 11/25/2015 5:03 AM, Michael S. Tsirkin wrote:
>+void vfio_migration_cap_handle(PCIDevice *pdev, uint32_t addr,
>+                                  uint32_t val, int len)
>+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
>+    if (addr == vdev->migration_cap + PCI_VF_MIGRATION_VF_STATUS
>+        && val == PCI_VF_READY_FOR_MIGRATION) {
>+        qemu_event_set(&migration_event);
This would wake migration so it can proceed -
except it needs QEMU lock to run, and that's
taken by the migration thread.

Sorry, I seem to miss something.
Which lock may cause dead lock when calling vfio_migration_cap_handle()
and run migration?
The function is called when VF accesses faked PCI capability.

It seems unlikely that this ever worked - how
did you test this?

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