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[80.230.35.22]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47d865e3d22sm96167405e9.1.2026.01.10.15.56.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Jan 2026 15:56:37 -0800 (PST) Date: Sat, 10 Jan 2026 18:56:35 -0500 From: "Michael S. Tsirkin" To: Eugenio =?iso-8859-1?Q?P=E9rez?= Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, Maxime Coquelin , Laurent Vivier , Cindy Lu , jasowang@redhat.com, Xuan Zhuo , Stefano Garzarella , Yongji Xie Subject: Re: [PATCH v11 10/12] vduse: merge tree search logic of IOTLB_GET_FD and IOTLB_GET_INFO ioctls Message-ID: <20260110185423-mutt-send-email-mst@kernel.org> References: <20260109152430.512923-1-eperezma@redhat.com> <20260109152430.512923-11-eperezma@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260109152430.512923-11-eperezma@redhat.com> On Fri, Jan 09, 2026 at 04:24:28PM +0100, Eugenio Pérez wrote: > The next patch adds new ioctl with the ASID member per entry. Abstract > these two so it can be build on top easily. > > Signed-off-by: Eugenio Pérez > --- > v11: New in v11 > --- > drivers/vdpa/vdpa_user/vduse_dev.c | 101 ++++++++++++++++------------- > 1 file changed, 55 insertions(+), 46 deletions(-) > > diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c > index 675da1465e0e..bf437816fd7d 100644 > --- a/drivers/vdpa/vdpa_user/vduse_dev.c > +++ b/drivers/vdpa/vdpa_user/vduse_dev.c > @@ -1247,6 +1247,50 @@ static void vduse_vq_update_effective_cpu(struct vduse_virtqueue *vq) > vq->irq_effective_cpu = curr_cpu; > } > > +static int vduse_dev_iotlb_entry(struct vduse_dev *dev, > + struct vduse_iotlb_entry *entry, > + struct file **f, uint64_t *capability) > +{ > + int r = -EINVAL; > + struct vhost_iotlb_map *map; > + const struct vdpa_map_file *map_file; > + > + if (entry->start > entry->last) > + return -EINVAL; > + > + mutex_lock(&dev->domain_lock); > + if (!dev->domain) > + goto out; > + > + spin_lock(&dev->domain->iotlb_lock); > + map = vhost_iotlb_itree_first(dev->domain->iotlb, entry->start, > + entry->last); > + if (map) { > + if (f) { > + map_file = (struct vdpa_map_file *)map->opaque; map_file assigned value when f != NULL here ... > + *f = get_file(map_file->file); > + } > + entry->offset = map_file->offset; but dereferenced unconditionally here. > + entry->start = map->start; > + entry->last = map->last; > + entry->perm = map->perm; > + if (capability) { > + *capability = 0; > + > + if (dev->domain->bounce_map && map->start == 0 && > + map->last == dev->domain->bounce_size - 1) > + *capability |= VDUSE_IOVA_CAP_UMEM; > + } > + > + r = 0; > + } > + spin_unlock(&dev->domain->iotlb_lock); > + > +out: > + mutex_unlock(&dev->domain_lock); > + return r; > +} > + > static long vduse_dev_ioctl(struct file *file, unsigned int cmd, > unsigned long arg) > {