linux-kernel - Re: [PATCH 5/6] vringh: fix copy direction of vringh_iov_push

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Message-ID: <20190923115930-mutt-send-email-mst@kernel.org>
Date:   Mon, 23 Sep 2019 12:00:41 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org, kwankhede@...dia.com,
        tiwei.bie@...el.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, cohuck@...hat.com,
        maxime.coquelin@...hat.com, cunming.liang@...el.com,
        zhihong.wang@...el.com, rob.miller@...adcom.com,
        xiao.w.wang@...el.com, haotian.wang@...ive.com,
        zhenyuw@...ux.intel.com, zhi.a.wang@...el.com,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, airlied@...ux.ie, daniel@...ll.ch,
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        eperezma@...hat.com, lulu@...hat.com, parav@...lanox.com
Subject: Re: [PATCH 5/6] vringh: fix copy direction of vringh_iov_push_kern()

On Mon, Sep 23, 2019 at 09:45:59AM -0600, Alex Williamson wrote:
> On Mon, 23 Sep 2019 21:03:30 +0800
> Jason Wang <jasowang@...hat.com> wrote:
> 
> > We want to copy from iov to buf, so the direction was wrong.
> > 
> > Signed-off-by: Jason Wang <jasowang@...hat.com>
> > ---
> >  drivers/vhost/vringh.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> 
> Why is this included in the series?  Seems like an unrelated fix being
> held up within a proposal for a new feature.  Thanks,
> 
> Alex

It's better to have it as patch 1/6, but it's a dependency of the
example driver in the series. I can reorder when I apply.


> > diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
> > index 08ad0d1f0476..a0a2d74967ef 100644
> > --- a/drivers/vhost/vringh.c
> > +++ b/drivers/vhost/vringh.c
> > @@ -852,6 +852,12 @@ static inline int xfer_kern(void *src, void *dst, size_t len)
> >  	return 0;
> >  }
> >  
> > +static inline int kern_xfer(void *dst, void *src, size_t len)
> > +{
> > +	memcpy(dst, src, len);
> > +	return 0;
> > +}
> > +
> >  /**
> >   * vringh_init_kern - initialize a vringh for a kernelspace vring.
> >   * @vrh: the vringh to initialize.
> > @@ -958,7 +964,7 @@ EXPORT_SYMBOL(vringh_iov_pull_kern);
> >  ssize_t vringh_iov_push_kern(struct vringh_kiov *wiov,
> >  			     const void *src, size_t len)
> >  {
> > -	return vringh_iov_xfer(wiov, (void *)src, len, xfer_kern);
> > +	return vringh_iov_xfer(wiov, (void *)src, len, kern_xfer);
> >  }
> >  EXPORT_SYMBOL(vringh_iov_push_kern);
> >