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vos: add udm handshake#127
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YuanyuanZhao609 wants to merge 1 commit intoprojectceladon:celadon/u/mr0/masterfrom
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vos: add udm handshake#127YuanyuanZhao609 wants to merge 1 commit intoprojectceladon:celadon/u/mr0/masterfrom
YuanyuanZhao609 wants to merge 1 commit intoprojectceladon:celadon/u/mr0/masterfrom
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Add udm synchronization between BE and FE. 1. Add handshake. When the VM which UDM run in shutdown and BE do not have change to notify FE, running FE can know the BE status change by check handshake mask. The handshake mask lays in virtio header in share memory BAR. It is checked every 2 seconds. 2. Add event interrupt. When the backend application exits normally or the VM where the backend resides is shut down normally, BE can trigger a interrupt, and notify FE the event. 3. Create /dev/virtio_shmemX which set auto or manual unresigter virtio device by 'VIRTIO_SHMEM_IOCTL_AUTO_REMOVE'. In this state, APP in user space can unregister the device by 'VIRTIO_SHMEM_IOCTL_UNREGISTER'. Signed-off-by: Yuanyuan Zhao <yuanyuan.zhao@intel.com>
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Add udm handshake between BE and FE. When the VM which UDM run in shutdown and BE do not have change to notify FE, running FE can know the BE status change by check handshake mask.
The handshake mask lays in virtio header in share memory BAR. It is checked every 2 seconds.