linux-kernel - Re: ublk-qcow2: ublk-qcow2 is available

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Message-ID: <CAJSP0QXbnhkVgfgMfC=MAyvF63Oof_ZGDvNFhniDCvVY-f6Hmw@mail.gmail.com>
Date:   Wed, 12 Oct 2022 10:15:28 -0400
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     "Richard W.M. Jones" <rjones@...hat.com>
Cc:     Ming Lei <tom.leiming@...il.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        io-uring@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Kirill Tkhai <kirill.tkhai@...nvz.org>,
        Manuel Bentele <development@...uel-bentele.de>,
        qemu-devel@...gnu.org, Kevin Wolf <kwolf@...hat.com>,
        Xie Yongji <xieyongji@...edance.com>,
        "Denis V. Lunev" <den@...nvz.org>,
        Stefano Garzarella <sgarzare@...hat.com>
Subject: Re: ublk-qcow2: ublk-qcow2 is available

On Thu, 6 Oct 2022 at 06:14, Richard W.M. Jones <rjones@...hat.com> wrote:
>
> On Tue, Oct 04, 2022 at 09:53:32AM -0400, Stefan Hajnoczi wrote:
> > qemu-nbd doesn't use io_uring to handle the backend IO,
>
> Would this be fixed by your (not yet upstream) libblkio driver for
> qemu?

I was wrong, qemu-nbd has syntax to use io_uring:

  $ qemu-nbd ... --image-opts driver=file,filename=test.img,aio=io_uring

The new libblkio driver will also support io_uring, but QEMU's
built-in io_uring support is already available and can be used as
shown above.

Stefan