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SubjectRe: [PATCH] Bugfix for handling of shadow doorbell buffer.
On Tue, Aug 14, 2018 at 06:35:16PM -0700, Michal Wnukowski wrote:
>
> The other side in this case is not actual controller hardware, but
> virtual one (the regular hardware should rely on normal MMIO
> doorbells).

There could very much be real hardware there. We've made it clear
in the spec that while a typical use case is a virtualized controller
there is nothing peventing hardware implementations. There have
been previous hardware prototypes to use very similar tricks, e.g.:

https://www.usenix.org/node/179878

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