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vhost: add non-blocking API for posting interrupt
Vhost-user library locks all VQ's access lock when processing vring based messages, such as SET_VRING_KICK and SET_VRING_CALL, and the data processing thread may already be started, e.g: SPDK vhost-blk and vhost-scsi will start the data processing thread when one vring is ready, then deadlock may happen when SPDK is posting interrupts to VM. Here, we add a new API which allows caller to try again later for this case. Bugzilla ID: 1015 Fixes: c573699 ("vhost: fix missing virtqueue lock protection") Cc: stable@dpdk.org Signed-off-by: Changpeng Liu <changpeng.liu@intel.com> Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
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