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The virtio has two virtio queues, TX and RX. TX have two segment buffers one for header and one for data. The virtio_mei declares host buffer of size 128 slots, each slot is a 4 bytes value. For synchronization hw_ready and host_reset configuration flags are used that emulates mei reset flow. And last fw status registers must be also readable via virtio mei device. Tracked-On: #1536 Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Acked-by: Wang, Yu1 <yu1.wang@intel.com>