netdev - Re: Re: [RFC v4 07/11] vduse: Introduce VDUSE

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Date:   Thu, 11 Mar 2021 10:28:45 +0800
From:   Yongji Xie <xieyongji@...edance.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Parav Pandit <parav@...dia.com>, Bob Liu <bob.liu@...cle.com>,
        Christoph Hellwig <hch@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, viro@...iv.linux.org.uk,
        Jens Axboe <axboe@...nel.dk>, bcrl@...ck.org,
        Jonathan Corbet <corbet@....net>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: Re: [RFC v4 07/11] vduse: Introduce VDUSE - vDPA Device in Userspace

On Wed, Mar 10, 2021 at 8:58 PM Jason Wang <jasowang@...hat.com> wrote:
>
>
> On 2021/2/23 7:50 下午, Xie Yongji wrote:
> > +
> > +     switch (cmd) {
> > +     case VDUSE_IOTLB_GET_FD: {
> > +             struct vduse_iotlb_entry entry;
> > +             struct vhost_iotlb_map *map;
> > +             struct vdpa_map_file *map_file;
> > +             struct file *f = NULL;
> > +
> > +             ret = -EFAULT;
> > +             if (copy_from_user(&entry, argp, sizeof(entry)))
> > +                     break;
> > +
> > +             spin_lock(&dev->iommu_lock);
> > +             map = vhost_iotlb_itree_first(dev->iommu, entry.start,
> > +                                           entry.last);
> > +             if (map) {
> > +                     map_file = (struct vdpa_map_file *)map->opaque;
> > +                     f = get_file(map_file->file);
> > +                     entry.offset = map_file->offset;
> > +                     entry.start = map->start;
> > +                     entry.last = map->last;
> > +                     entry.perm = map->perm;
> > +             }
> > +             spin_unlock(&dev->iommu_lock);
> > +             if (!f) {
> > +                     ret = -EINVAL;
> > +                     break;
> > +             }
> > +             if (copy_to_user(argp, &entry, sizeof(entry))) {
> > +                     fput(f);
> > +                     ret = -EFAULT;
> > +                     break;
> > +             }
> > +             ret = get_unused_fd_flags(perm_to_file_flags(entry.perm));
> > +             if (ret < 0) {
> > +                     fput(f);
> > +                     break;
> > +             }
> > +             fd_install(ret, f);
>
>
> So at least we need to use receice_fd_user() here to give a chance to be
> hooked into security module.
>

Good point. Will do it in v5.

Thanks,
Yongji