v5: * Plumbing vm change state handlers into DeviceClass/BusClass is a rather large bug fix. Instead I've combined the previous priorities approach with the observation from Kevin and Paolo that we really want to order by qdev tree depth.
The new qdev_add_vm_change_state_handler() API lets DeviceStates register callbacks that execute in qdev tree depth order. This solves the virtio-scsi bug since the virtio-scsi device's callback must complete before its child scsi-disk's callback runs. Is this a good compromise for everyone? Stefan Hajnoczi (3): vl: add qemu_add_vm_change_state_handler_prio() qdev: add qdev_add_vm_change_state_handler() virtio-scsi: restart DMA after iothread hw/core/Makefile.objs | 1 + include/hw/qdev-core.h | 5 +++ include/sysemu/sysemu.h | 2 + hw/core/vm-change-state-handler.c | 61 +++++++++++++++++++++++++++++++ hw/scsi/scsi-bus.c | 4 +- hw/virtio/virtio.c | 4 +- vl.c | 59 ++++++++++++++++++++++++------ 7 files changed, 120 insertions(+), 16 deletions(-) create mode 100644 hw/core/vm-change-state-handler.c -- 2.21.0
