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Date: Fri, 10 Jul 2020 11:33:09 -0400
From: Konrad Rzeszutek Wilk <>
To: Stefano Garzarella <>
Cc: Jens Axboe <>, Sargun Dhillon <>,
        Kees Cook <>,,,
        Kernel Hardening <>,
        Jann Horn <>, Aleksa Sarai <>,
        Christian Brauner <>,
        Stefan Hajnoczi <>,,
        Alexander Viro <>,
        Jeff Moyer <>
Subject: Re: [PATCH RFC 0/3] io_uring: add restrictions to support untrusted
 applications and guests

> Just to recap the proposal, the idea is to add some restrictions to the
> operations (sqe, register, fixed file) to safely allow untrusted applications
> or guests to use io_uring queues.


This is neat and quite cool - but one thing that keeps nagging me is
what how much overhead does this cut from the existing setup when you use
virtio (with guests obviously)? That is from a high level view the
beaty of io_uring being passed in the guest is you don't have the
virtio ring -> io_uring processing, right?


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