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authorChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:34:26 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:35:44 +0000
commit25f8033d556aa17afaea4a5196ea7a69fe248320 (patch)
tree0f056db167683be54ea1e5e72d29d6069af55e7d /results/classifier/deepseek-2-tmp/output/hypervisor/2480
parent8e6da29e4ee5fc14bc1cc816a24f21271f14090d (diff)
downloadqemu-analysis-25f8033d556aa17afaea4a5196ea7a69fe248320.tar.gz
qemu-analysis-25f8033d556aa17afaea4a5196ea7a69fe248320.zip
add new temporary deepseek-r1:14b results
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+
+Two questions about VFIO device live migration
+Description of problem:
+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 ^_^
+Steps to reproduce:
+1.
+2.
+3.
+Additional information:
+