linux-kernel - Re: [PATCH] vhost: fix VHOST_GET_BACKEND

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Message-ID: <20180903231102-mutt-send-email-mst@kernel.org>
Date:   Mon, 3 Sep 2018 23:11:11 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Gleb Fotengauer-Malinovskiy <glebfm@...linux.org>,
        "David S. Miller" <davem@...emloft.net>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vhost: fix VHOST_GET_BACKEND_FEATURES ioctl request
 definition

On Tue, Sep 04, 2018 at 11:08:40AM +0800, Jason Wang wrote:
> 
> 
> On 2018年09月04日 10:22, Michael S. Tsirkin wrote:
> > On Mon, Sep 03, 2018 at 08:59:13PM +0300, Gleb Fotengauer-Malinovskiy wrote:
> > > The _IOC_READ flag fits this ioctl request more because this request
> > > actually only writes to, but doesn't read from userspace.
> > > See NOTEs in include/uapi/asm-generic/ioctl.h for more information.
> > > 
> > > Fixes: 429711aec282 ("vhost: switch to use new message format")
> > > Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm@...linux.org>
> > Hmm it does make sense, and it's not too late to fix this up.
> > Jason, what's your take on this? Was _IOW intentional?
> 
> My bad, not intentional. And I agree that fixing this is not too late.
> 
> So
> 
> Acked-by: Jason Wang <jasowang@...hat.com>


OK then

Acked-by: Michael S. Tsirkin <mst@...hat.com>

> > 
> > > ---
> > >   include/uapi/linux/vhost.h | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
> > > index b1e22c40c4b6..84c3de89696a 100644
> > > --- a/include/uapi/linux/vhost.h
> > > +++ b/include/uapi/linux/vhost.h
> > > @@ -176,7 +176,7 @@ struct vhost_memory {
> > >   #define VHOST_BACKEND_F_IOTLB_MSG_V2 0x1
> > >   #define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64)
> > > -#define VHOST_GET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x26, __u64)
> > > +#define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64)
> > >   /* VHOST_NET specific defines */
> > > 
> > > -- 
> > > glebfm