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Add virtio bus 'poll' method allowing us to inform backend we are

Description

Add virtio bus 'poll' method allowing us to inform backend we are
going to poll virtqueue.

Use on BERI soft-core to invalidate cpu caches.

Reviewed by: bryanv
Sponsored by: DARPA, AFRL

Details

Provenance
brAuthored on
Reviewer
bryanv
Parents
rS275727: For architectures where time_t is wide enough, in particular, 64bit
Branches
Unknown
Tags
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