[14/15] net/virtio: add vDPA op to get notification area
diff mbox series

Message ID 20190829080000.20806-15-maxime.coquelin@redhat.com
State New
Delegated to: Maxime Coquelin
Headers show
Series
  • Introduce Virtio vDPA driver
Related show

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation fail Compilation issues

Commit Message

Maxime Coquelin Aug. 29, 2019, 7:59 a.m. UTC
This patch implements the vDPA .get_notify_area()
callback.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 drivers/net/virtio/virtio_vdpa.c | 33 ++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

Comments

Tiwei Bie Sept. 3, 2019, 5:02 a.m. UTC | #1
On Thu, Aug 29, 2019 at 09:59:59AM +0200, Maxime Coquelin wrote:
> This patch implements the vDPA .get_notify_area()
> callback.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  drivers/net/virtio/virtio_vdpa.c | 33 ++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/drivers/net/virtio/virtio_vdpa.c b/drivers/net/virtio/virtio_vdpa.c
> index e0b2f99ba..e681f527a 100644
> --- a/drivers/net/virtio/virtio_vdpa.c
> +++ b/drivers/net/virtio/virtio_vdpa.c
> @@ -707,6 +707,38 @@ virtio_vdpa_get_vfio_device_fd(int vid)
>  	return list->dev->vfio_dev_fd;
>  }
>  
> +static int
> +virtio_vdpa_get_notify_area(int vid, int qid, uint64_t *offset, uint64_t *size)
> +{
> +	int did;
> +	struct internal_list *list;
> +	struct virtio_vdpa_device *dev;
> +	struct vfio_region_info reg = { .argsz = sizeof(reg) };
> +	int ret;
> +
> +	did = rte_vhost_get_vdpa_device_id(vid);
> +	list = find_internal_resource_by_did(did);
> +	if (list == NULL) {
> +		DRV_LOG(ERR, "Invalid device id: %d", did);
> +		return -1;
> +	}
> +
> +	dev = list->dev;
> +
> +	reg.index = dev->hw.notify_region;
> +	ret = ioctl(dev->vfio_dev_fd, VFIO_DEVICE_GET_REGION_INFO, &reg);
> +	if (ret) {
> +		DRV_LOG(ERR, "Get not get device region info: %s",
> +				strerror(errno));
> +		return -1;
> +	}
> +
> +	*offset = dev->vqs[qid].notify_addr - dev->hw.notify_base + reg.offset;
> +	*size = 0x1000;

It would be better to check whether the size is no less
than 0x1000, otherwise it's possible to give guest the
access to other registers of the vdpa device.

Regards,
Tiwei

> +
> +	return 0;
> +}
> +
>  static struct rte_vdpa_dev_ops virtio_vdpa_ops = {
>  	.get_queue_num = virtio_vdpa_get_queue_num,
>  	.get_features = virtio_vdpa_get_features,
> @@ -716,6 +748,7 @@ static struct rte_vdpa_dev_ops virtio_vdpa_ops = {
>  	.set_features = virtio_vdpa_set_features,
>  	.get_vfio_group_fd = virtio_vdpa_get_vfio_group_fd,
>  	.get_vfio_device_fd = virtio_vdpa_get_vfio_device_fd,
> +	.get_notify_area = virtio_vdpa_get_notify_area,
>  };
>  
>  static inline int
> -- 
> 2.21.0
>
Maxime Coquelin Sept. 3, 2019, 7:36 a.m. UTC | #2
On 9/3/19 7:02 AM, Tiwei Bie wrote:
> On Thu, Aug 29, 2019 at 09:59:59AM +0200, Maxime Coquelin wrote:
>> This patch implements the vDPA .get_notify_area()
>> callback.
>>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>> ---
>>  drivers/net/virtio/virtio_vdpa.c | 33 ++++++++++++++++++++++++++++++++
>>  1 file changed, 33 insertions(+)
>>
>> diff --git a/drivers/net/virtio/virtio_vdpa.c b/drivers/net/virtio/virtio_vdpa.c
>> index e0b2f99ba..e681f527a 100644
>> --- a/drivers/net/virtio/virtio_vdpa.c
>> +++ b/drivers/net/virtio/virtio_vdpa.c
>> @@ -707,6 +707,38 @@ virtio_vdpa_get_vfio_device_fd(int vid)
>>  	return list->dev->vfio_dev_fd;
>>  }
>>  
>> +static int
>> +virtio_vdpa_get_notify_area(int vid, int qid, uint64_t *offset, uint64_t *size)
>> +{
>> +	int did;
>> +	struct internal_list *list;
>> +	struct virtio_vdpa_device *dev;
>> +	struct vfio_region_info reg = { .argsz = sizeof(reg) };
>> +	int ret;
>> +
>> +	did = rte_vhost_get_vdpa_device_id(vid);
>> +	list = find_internal_resource_by_did(did);
>> +	if (list == NULL) {
>> +		DRV_LOG(ERR, "Invalid device id: %d", did);
>> +		return -1;
>> +	}
>> +
>> +	dev = list->dev;
>> +
>> +	reg.index = dev->hw.notify_region;
>> +	ret = ioctl(dev->vfio_dev_fd, VFIO_DEVICE_GET_REGION_INFO, &reg);
>> +	if (ret) {
>> +		DRV_LOG(ERR, "Get not get device region info: %s",
>> +				strerror(errno));
>> +		return -1;
>> +	}
>> +
>> +	*offset = dev->vqs[qid].notify_addr - dev->hw.notify_base + reg.offset;
>> +	*size = 0x1000;
> 
> It would be better to check whether the size is no less
> than 0x1000, otherwise it's possible to give guest the
> access to other registers of the vdpa device.

Correct, if offset is not page-aligned, then it would mean one page may
be mapped while not needed. I took the ifcvf driver as example and
forgot to fix it. (Maybe it should also be fixed in ifcvf driver?)

Thanks,
Maxime
> Regards,
> Tiwei
> 
>> +
>> +	return 0;
>> +}
>> +
>>  static struct rte_vdpa_dev_ops virtio_vdpa_ops = {
>>  	.get_queue_num = virtio_vdpa_get_queue_num,
>>  	.get_features = virtio_vdpa_get_features,
>> @@ -716,6 +748,7 @@ static struct rte_vdpa_dev_ops virtio_vdpa_ops = {
>>  	.set_features = virtio_vdpa_set_features,
>>  	.get_vfio_group_fd = virtio_vdpa_get_vfio_group_fd,
>>  	.get_vfio_device_fd = virtio_vdpa_get_vfio_device_fd,
>> +	.get_notify_area = virtio_vdpa_get_notify_area,
>>  };
>>  
>>  static inline int
>> -- 
>> 2.21.0
>>
Tiwei Bie Sept. 3, 2019, 8:40 a.m. UTC | #3
On Tue, Sep 03, 2019 at 09:36:54AM +0200, Maxime Coquelin wrote:
> On 9/3/19 7:02 AM, Tiwei Bie wrote:
> > On Thu, Aug 29, 2019 at 09:59:59AM +0200, Maxime Coquelin wrote:
> >> This patch implements the vDPA .get_notify_area()
> >> callback.
> >>
> >> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >> ---
> >>  drivers/net/virtio/virtio_vdpa.c | 33 ++++++++++++++++++++++++++++++++
> >>  1 file changed, 33 insertions(+)
> >>
> >> diff --git a/drivers/net/virtio/virtio_vdpa.c b/drivers/net/virtio/virtio_vdpa.c
> >> index e0b2f99ba..e681f527a 100644
> >> --- a/drivers/net/virtio/virtio_vdpa.c
> >> +++ b/drivers/net/virtio/virtio_vdpa.c
> >> @@ -707,6 +707,38 @@ virtio_vdpa_get_vfio_device_fd(int vid)
> >>  	return list->dev->vfio_dev_fd;
> >>  }
> >>  
> >> +static int
> >> +virtio_vdpa_get_notify_area(int vid, int qid, uint64_t *offset, uint64_t *size)
> >> +{
> >> +	int did;
> >> +	struct internal_list *list;
> >> +	struct virtio_vdpa_device *dev;
> >> +	struct vfio_region_info reg = { .argsz = sizeof(reg) };
> >> +	int ret;
> >> +
> >> +	did = rte_vhost_get_vdpa_device_id(vid);
> >> +	list = find_internal_resource_by_did(did);
> >> +	if (list == NULL) {
> >> +		DRV_LOG(ERR, "Invalid device id: %d", did);
> >> +		return -1;
> >> +	}
> >> +
> >> +	dev = list->dev;
> >> +
> >> +	reg.index = dev->hw.notify_region;
> >> +	ret = ioctl(dev->vfio_dev_fd, VFIO_DEVICE_GET_REGION_INFO, &reg);
> >> +	if (ret) {
> >> +		DRV_LOG(ERR, "Get not get device region info: %s",
> >> +				strerror(errno));
> >> +		return -1;
> >> +	}
> >> +
> >> +	*offset = dev->vqs[qid].notify_addr - dev->hw.notify_base + reg.offset;
> >> +	*size = 0x1000;
> > 
> > It would be better to check whether the size is no less
> > than 0x1000, otherwise it's possible to give guest the
> > access to other registers of the vdpa device.
> 
> Correct, if offset is not page-aligned, then it would mean one page may
> be mapped while not needed. I took the ifcvf driver as example and
> forgot to fix it. (Maybe it should also be fixed in ifcvf driver?)

The ifcvf hardware will make sure that the notify register will
stay in a separate page, so the size is hardcoded in ifcvf driver.

Regards,
Tiwei

> 
> Thanks,
> Maxime
> > Regards,
> > Tiwei
> > 
> >> +
> >> +	return 0;
> >> +}
> >> +
> >>  static struct rte_vdpa_dev_ops virtio_vdpa_ops = {
> >>  	.get_queue_num = virtio_vdpa_get_queue_num,
> >>  	.get_features = virtio_vdpa_get_features,
> >> @@ -716,6 +748,7 @@ static struct rte_vdpa_dev_ops virtio_vdpa_ops = {
> >>  	.set_features = virtio_vdpa_set_features,
> >>  	.get_vfio_group_fd = virtio_vdpa_get_vfio_group_fd,
> >>  	.get_vfio_device_fd = virtio_vdpa_get_vfio_device_fd,
> >> +	.get_notify_area = virtio_vdpa_get_notify_area,
> >>  };
> >>  
> >>  static inline int
> >> -- 
> >> 2.21.0
> >>

Patch
diff mbox series

diff --git a/drivers/net/virtio/virtio_vdpa.c b/drivers/net/virtio/virtio_vdpa.c
index e0b2f99ba..e681f527a 100644
--- a/drivers/net/virtio/virtio_vdpa.c
+++ b/drivers/net/virtio/virtio_vdpa.c
@@ -707,6 +707,38 @@  virtio_vdpa_get_vfio_device_fd(int vid)
 	return list->dev->vfio_dev_fd;
 }
 
+static int
+virtio_vdpa_get_notify_area(int vid, int qid, uint64_t *offset, uint64_t *size)
+{
+	int did;
+	struct internal_list *list;
+	struct virtio_vdpa_device *dev;
+	struct vfio_region_info reg = { .argsz = sizeof(reg) };
+	int ret;
+
+	did = rte_vhost_get_vdpa_device_id(vid);
+	list = find_internal_resource_by_did(did);
+	if (list == NULL) {
+		DRV_LOG(ERR, "Invalid device id: %d", did);
+		return -1;
+	}
+
+	dev = list->dev;
+
+	reg.index = dev->hw.notify_region;
+	ret = ioctl(dev->vfio_dev_fd, VFIO_DEVICE_GET_REGION_INFO, &reg);
+	if (ret) {
+		DRV_LOG(ERR, "Get not get device region info: %s",
+				strerror(errno));
+		return -1;
+	}
+
+	*offset = dev->vqs[qid].notify_addr - dev->hw.notify_base + reg.offset;
+	*size = 0x1000;
+
+	return 0;
+}
+
 static struct rte_vdpa_dev_ops virtio_vdpa_ops = {
 	.get_queue_num = virtio_vdpa_get_queue_num,
 	.get_features = virtio_vdpa_get_features,
@@ -716,6 +748,7 @@  static struct rte_vdpa_dev_ops virtio_vdpa_ops = {
 	.set_features = virtio_vdpa_set_features,
 	.get_vfio_group_fd = virtio_vdpa_get_vfio_group_fd,
 	.get_vfio_device_fd = virtio_vdpa_get_vfio_device_fd,
+	.get_notify_area = virtio_vdpa_get_notify_area,
 };
 
 static inline int