Re: [PATCH V3 6/6] vDPA/ifcvf: verify mandatory feature bits for vDPA

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On 2021/3/10 5:00 下午, Zhu Lingshan wrote:
vDPA requres VIRTIO_F_ACCESS_PLATFORM as a must, this commit
examines this when set features.

Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
---
  drivers/vdpa/ifcvf/ifcvf_base.c | 8 ++++++++
  drivers/vdpa/ifcvf/ifcvf_base.h | 1 +
  drivers/vdpa/ifcvf/ifcvf_main.c | 5 +++++
  3 files changed, 14 insertions(+)

diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c b/drivers/vdpa/ifcvf/ifcvf_base.c
index ea6a78791c9b..58f47fdce385 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.c
+++ b/drivers/vdpa/ifcvf/ifcvf_base.c
@@ -224,6 +224,14 @@ u64 ifcvf_get_features(struct ifcvf_hw *hw)
  	return hw->hw_features;
  }
+int ifcvf_verify_min_features(struct ifcvf_hw *hw)
+{
+	if (!(hw->hw_features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)))
+		return -EINVAL;
+
+	return 0;
+}
+
  void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,
  			   void *dst, int length)
  {
diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h b/drivers/vdpa/ifcvf/ifcvf_base.h
index dbb8c10aa3b1..91c5735d4dc9 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.h
+++ b/drivers/vdpa/ifcvf/ifcvf_base.h
@@ -123,6 +123,7 @@ void io_write64_twopart(u64 val, u32 *lo, u32 *hi);
  void ifcvf_reset(struct ifcvf_hw *hw);
  u64 ifcvf_get_features(struct ifcvf_hw *hw);
  u64 ifcvf_get_hw_features(struct ifcvf_hw *hw);
+int ifcvf_verify_min_features(struct ifcvf_hw *hw);
  u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid);
  int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num);
  struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw);
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index 25fb9dfe23f0..f624f202447d 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -179,6 +179,11 @@ static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
  static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
  {
  	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
+	int ret;
+
+	ret = ifcvf_verify_min_features(vf);


So this validate device features instead of driver which is the one we really want to check?

Thanks


+	if (ret)
+		return ret;
vf->req_features = features;




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