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+id = 2480
+title = "Two questions about VFIO device live migration"
+state = "closed"
+created_at = "2024-08-05T03:17:23.768Z"
+closed_at = "2025-03-10T21:32:03.771Z"
+labels = ["VFIO"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2480"
+host-os = "Linux 4.18.0-15-generic #16~18.04.1-Ubuntu SMP Thu Feb 7 14:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux"
+host-arch = "x86_64"
+qemu-version = "build qemu by myself with stable-6.0 branch"
+guest-os = "Linux"
+guest-arch = "x86_64"
+description = """For my own pcie device, i implement system memory && device memory dirty bitmap track and works well
+
+use pre-copy mode live migration by the way.
+
+first question:
+- for system memory dirty bitmap sync, notice that last sync will come early than i expected
+  read qemu code and found qemu will call every savevm_state.handlers->save_live_complete_precopy callback 
+  in "qemu_savevm_state_complete_precopy_iterable", and "vfio" handler will always behind "ram".
+  so here is question, my own vfio device will only be halted after "vfio" handler enter 
+  save_live_complete_precopy, and last system memory dirty bitmap sync will come with "ram"'s 
+  save_live_complete_precopy, there will be some system dirty between this period, should we add one more 
+  system dirty bitmap sync after "vfio"'s save_live_complete_precopy
+
+second question:
+- notice that qemu will clean up migration and call every savevm_state.handlers->save_cleanup call back, and   
+  in this function, qemu will only call vfio listener's log_global_stop call back when vm_is_running 
+  but for my vfio device, state will be paused(postmigrate) when enter here, so there is no chance for qemu 
+  to relese some resource create by my device kernel mode driver, where should i put the logic about "stop 
+  migration resource" anyway
+
+Thanks ^_^"""
+reproduce = """1.
+2.
+3."""
+additional = """"""