On 2/19/2021 6:38 PM, Jason Wang wrote:
Right now the value is exposed to userspace via GET_VRING_BASE, so
only last_avail_idx is synced. If we need sync last_used_idx, we
should also sync pending indices which requires more thoughts.
Technically it doesn't sound right - crossing the boundary a bit even
with simplified form of assumption. But depending on how userspace
could make use of this API, it doesn't seem it breaks existing
functionality for the moment.
I don't get here, maybe you can explain a little bit more?
Please refer to the email I just sent.
https://lore.kernel.org/lkml/033b0806-4037-5755-a1fa-91dbb58bab2e@xxxxxxxxxx/
-Siwei
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