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Diffstat (limited to 'results/classifier/108/other/2480')
| -rw-r--r-- | results/classifier/108/other/2480 | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/results/classifier/108/other/2480 b/results/classifier/108/other/2480 new file mode 100644 index 00000000..4b53f14a --- /dev/null +++ b/results/classifier/108/other/2480 @@ -0,0 +1,44 @@ +device: 0.880 +performance: 0.600 +graphic: 0.583 +PID: 0.545 +socket: 0.444 +boot: 0.415 +files: 0.411 +network: 0.405 +vnc: 0.383 +debug: 0.378 +other: 0.357 +permissions: 0.288 +semantic: 0.278 +KVM: 0.137 + +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: + |