linux-kernel - Re: [PATCH] vduse: add virtio

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Message-ID: <CAJaqyWdC-Tte+ao6pk22fq-mUym8C9guQFThSnG5gMxWNqWyXw@mail.gmail.com>
Date: Thu, 23 Jan 2025 08:26:57 +0100
From: Eugenio Perez Martin <eperezma@...hat.com>
To: Jason Wang <jasowang@...hat.com>, Stefan Hajnoczi <stefanha@...hat.com>
Cc: mst@...hat.com, virtualization@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, Hanna Reitz <hreitz@...hat.com>, 
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, German Maglione <gmaglione@...hat.com>
Subject: Re: [PATCH] vduse: add virtio_fs to allowed dev id

On Thu, Jan 23, 2025 at 2:50 AM Jason Wang <jasowang@...hat.com> wrote:
>
> On Wed, Jan 22, 2025 at 11:49 PM Stefan Hajnoczi <stefanha@...hat.com> wrote:
> >
> > On Tue, Jan 21, 2025 at 11:33:46AM +0100, Eugenio Pérez wrote:
> > > A VDUSE device that implements virtiofs device works fine just by
> > > adding the device id to the whitelist.
> >
> > The virtiofs DAX Window feature might require extra work. It is not
> > widely enabled though, so must virtiofs devices will work fine with just
> > virtqueue and configuration space support.
>
> +1.
>
> The DAX Window may help to reduce the bounce buffer copying and fit
> for the case where an AI application just accesses one single large
> file.
>
> We need to consider implementing this via VDUSE.
>
> Thanks
>
>

I thought DAX can only be applied in the VM case. Is it possible to
apply it using virtio_vdpa?

Is it possible to detect that the device is trying to use DAX so it
fails the negotiation?