Linux-Fsdevel Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Stefano Garzarella <sgarzare@redhat.com>
To: Colin Walters <walters@verbum.org>
Cc: Andy Lutomirski <luto@kernel.org>, Jens Axboe <axboe@kernel.dk>,
	Christoph Hellwig <hch@lst.de>, Kees Cook <keescook@chromium.org>,
	Pavel Begunkov <asml.silence@gmail.com>,
	Miklos Szeredi <miklos@szeredi.hu>,
	Matthew Wilcox <willy@infradead.org>,
	Jann Horn <jannh@google.com>,
	Christian Brauner <christian.brauner@ubuntu.com>,
	strace-devel@lists.strace.io, io-uring@vger.kernel.org,
	Linux API <linux-api@vger.kernel.org>,
	Linux FS Devel <linux-fsdevel@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Michael Kerrisk <mtk.manpages@gmail.com>,
	Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: strace of io_uring events?
Date: Fri, 24 Jul 2020 09:25:09 +0200	[thread overview]
Message-ID: <20200724072509.sgqlbuocpo2peian@steredhat.lan> (raw)
In-Reply-To: <d57e169a-55a0-4fa2-a7f2-9a462a786a38@www.fastmail.com>

On Thu, Jul 23, 2020 at 09:37:40AM -0400, Colin Walters wrote:
> On Tue, Jul 21, 2020, at 11:58 AM, Stefano Garzarella wrote:
> 
> > my use case concerns virtualization. The idea, that I described in the
> > proposal of io-uring restrictions [1], is to share io_uring CQ and SQ queues
> > with a guest VM for block operations.
> 
> Virtualization being a strong security barrier is in eternal conflict
> with maximizing performance.  All of these "let's add a special
> guest/host channel" are high risk areas.
> 
> And this effort in particular - is it *really* worth it to expose a
> brand new, fast moving Linux kernel interface (that probably hasn't
> been fuzzed as much as it needs to be) to virtual machines?
> 

It is an experiment to explore the potential of io_uring. In addition
the restrictions can also be useful for other use case, for example if
a process  wants to allow another process to use io_uring, but only allowing
a subset of operations.

> People who want maximum performance at the cost of a bit of security
> already have the choice to use Linux containers, where they can use
> io_uring natively.
> 

Thanks,
Stefano


  reply	other threads:[~2020-07-24  7:25 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15 11:12 Miklos Szeredi
2020-07-15 14:35 ` Andy Lutomirski
2020-07-15 17:11   ` Matthew Wilcox
2020-07-15 19:42     ` Pavel Begunkov
2020-07-15 20:09       ` Miklos Szeredi
2020-07-15 20:20         ` Pavel Begunkov
2020-07-15 23:07           ` Kees Cook
2020-07-16 13:14             ` Stefano Garzarella
2020-07-16 15:12               ` Kees Cook
2020-07-17  8:01                 ` Stefano Garzarella
2020-07-21 15:27                   ` Andy Lutomirski
2020-07-21 15:31                     ` Jens Axboe
2020-07-21 17:23                       ` Andy Lutomirski
2020-07-21 17:30                         ` Jens Axboe
2020-07-21 17:44                           ` Andy Lutomirski
2020-07-21 18:39                             ` Jens Axboe
2020-07-21 19:44                               ` Andy Lutomirski
2020-07-21 19:48                                 ` Jens Axboe
2020-07-21 19:56                                 ` Andres Freund
2020-07-21 19:37                         ` Andres Freund
2020-07-21 15:58                     ` Stefano Garzarella
2020-07-23 10:39                       ` Stefan Hajnoczi
2020-07-23 13:37                       ` Colin Walters
2020-07-24  7:25                         ` Stefano Garzarella [this message]
2020-07-16 13:17             ` Aleksa Sarai
2020-07-16 15:19               ` Kees Cook
2020-07-17  8:17               ` Cyril Hrubis
2020-07-16 16:24             ` Andy Lutomirski
2020-07-16  0:12     ` tytso

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200724072509.sgqlbuocpo2peian@steredhat.lan \
    --to=sgarzare@redhat.com \
    --cc=asml.silence@gmail.com \
    --cc=axboe@kernel.dk \
    --cc=christian.brauner@ubuntu.com \
    --cc=hch@lst.de \
    --cc=io-uring@vger.kernel.org \
    --cc=jannh@google.com \
    --cc=keescook@chromium.org \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@kernel.org \
    --cc=miklos@szeredi.hu \
    --cc=mtk.manpages@gmail.com \
    --cc=stefanha@redhat.com \
    --cc=strace-devel@lists.strace.io \
    --cc=walters@verbum.org \
    --cc=willy@infradead.org \
    --subject='Re: strace of io_uring events?' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).