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From: "Colin Walters" <walters@verbum.org>
To: "Stefano Garzarella" <sgarzare@redhat.com>,
	"Andy Lutomirski" <luto@kernel.org>
Cc: "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: Thu, 23 Jul 2020 09:37:40 -0400	[thread overview]
Message-ID: <d57e169a-55a0-4fa2-a7f2-9a462a786a38@www.fastmail.com> (raw)
In-Reply-To: <20200721155848.32xtze5ntvcmjv63@steredhat>

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?

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.


  parent reply	other threads:[~2020-07-23 13:38 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 [this message]
2020-07-24  7:25                         ` Stefano Garzarella
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

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