memory barriers in virtq.lua?

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Hi Nikolay,
I poked at src/lib/virtio/virtq.lua a bit -
I was surprised to find no explicit CPU memory
barriers in the virtq implementation.
These are typically required when using virtio
on smp machines - the spec actually mention where
barriers are necessary.
Are the barriers implicit somehow for lua?
I'd be curious to learn.


Thanks,

-- 
MST
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