Re: [PATCH] virtio: VIRTIO_F_IOMMU_PLATFORM -> VIRTIO_F_ACCESS_PLATFORM

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On 2020/6/25 上午6:25, Michael S. Tsirkin wrote:
Rename the bit to match latest virtio spec.
Add a compat macro to avoid breaking existing userspace.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
  arch/um/drivers/virtio_uml.c       |  2 +-
  drivers/vdpa/ifcvf/ifcvf_base.h    |  2 +-
  drivers/vdpa/vdpa_sim/vdpa_sim.c   |  4 ++--
  drivers/vhost/net.c                |  4 ++--
  drivers/vhost/vdpa.c               |  2 +-
  drivers/virtio/virtio_balloon.c    |  2 +-
  drivers/virtio/virtio_ring.c       |  2 +-
  include/linux/virtio_config.h      |  2 +-
  include/uapi/linux/virtio_config.h | 10 +++++++---
  tools/virtio/linux/virtio_config.h |  2 +-
  10 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index 351aee52aca6..a6c4bb6c2c01 100644
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -385,7 +385,7 @@ static irqreturn_t vu_req_interrupt(int irq, void *data)
  		}
  		break;
  	case VHOST_USER_SLAVE_IOTLB_MSG:
-		/* not supported - VIRTIO_F_IOMMU_PLATFORM */
+		/* not supported - VIRTIO_F_ACCESS_PLATFORM */
  	case VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG:
  		/* not supported - VHOST_USER_PROTOCOL_F_HOST_NOTIFIER */
  	default:
diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h b/drivers/vdpa/ifcvf/ifcvf_base.h
index f4554412e607..24af422b5a3e 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.h
+++ b/drivers/vdpa/ifcvf/ifcvf_base.h
@@ -29,7 +29,7 @@
  		 (1ULL << VIRTIO_F_VERSION_1)			| \
  		 (1ULL << VIRTIO_NET_F_STATUS)			| \
  		 (1ULL << VIRTIO_F_ORDER_PLATFORM)		| \
-		 (1ULL << VIRTIO_F_IOMMU_PLATFORM)		| \
+		 (1ULL << VIRTIO_F_ACCESS_PLATFORM)		| \
  		 (1ULL << VIRTIO_NET_F_MRG_RXBUF))
/* Only one queue pair for now. */
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index c7334cc65bb2..a9bc5e0fb353 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -55,7 +55,7 @@ struct vdpasim_virtqueue {
static u64 vdpasim_features = (1ULL << VIRTIO_F_ANY_LAYOUT) |
  			      (1ULL << VIRTIO_F_VERSION_1)  |
-			      (1ULL << VIRTIO_F_IOMMU_PLATFORM);
+			      (1ULL << VIRTIO_F_ACCESS_PLATFORM);
/* State of each vdpasim device */
  struct vdpasim {
@@ -450,7 +450,7 @@ static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
  	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
/* DMA mapping must be done by driver */
-	if (!(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
+	if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
  		return -EINVAL;
vdpasim->features = features & vdpasim_features;
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index e992decfec53..8e0921d3805d 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -73,7 +73,7 @@ enum {
  	VHOST_NET_FEATURES = VHOST_FEATURES |
  			 (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) |
  			 (1ULL << VIRTIO_NET_F_MRG_RXBUF) |
-			 (1ULL << VIRTIO_F_IOMMU_PLATFORM)
+			 (1ULL << VIRTIO_F_ACCESS_PLATFORM)
  };
enum {
@@ -1653,7 +1653,7 @@ static int vhost_net_set_features(struct vhost_net *n, u64 features)
  	    !vhost_log_access_ok(&n->dev))
  		goto out_unlock;
- if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) {
+	if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) {
  		if (vhost_init_device_iotlb(&n->dev, true))
  			goto out_unlock;
  	}
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index a54b60d6623f..18869a35d408 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -31,7 +31,7 @@ enum {
  		(1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) |
  		(1ULL << VIRTIO_F_ANY_LAYOUT) |
  		(1ULL << VIRTIO_F_VERSION_1) |
-		(1ULL << VIRTIO_F_IOMMU_PLATFORM) |
+		(1ULL << VIRTIO_F_ACCESS_PLATFORM) |
  		(1ULL << VIRTIO_F_RING_PACKED) |
  		(1ULL << VIRTIO_F_ORDER_PLATFORM) |
  		(1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 1f157d2f4952..fc7301406540 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -1120,7 +1120,7 @@ static int virtballoon_validate(struct virtio_device *vdev)
  	else if (!virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON))
  		__virtio_clear_bit(vdev, VIRTIO_BALLOON_F_REPORTING);
- __virtio_clear_bit(vdev, VIRTIO_F_IOMMU_PLATFORM);
+	__virtio_clear_bit(vdev, VIRTIO_F_ACCESS_PLATFORM);
  	return 0;
  }
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 58b96baa8d48..a1a5c2a91426 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2225,7 +2225,7 @@ void vring_transport_features(struct virtio_device *vdev)
  			break;
  		case VIRTIO_F_VERSION_1:
  			break;
-		case VIRTIO_F_IOMMU_PLATFORM:
+		case VIRTIO_F_ACCESS_PLATFORM:
  			break;
  		case VIRTIO_F_RING_PACKED:
  			break;
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index bb4cc4910750..f2cc2a0df174 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -171,7 +171,7 @@ static inline bool virtio_has_iommu_quirk(const struct virtio_device *vdev)
  	 * Note the reverse polarity of the quirk feature (compared to most
  	 * other features), this is for compatibility with legacy systems.
  	 */
-	return !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
+	return !virtio_has_feature(vdev, VIRTIO_F_ACCESS_PLATFORM);
  }
static inline
diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index ff8e7dc9d4dd..b5eda06f0d57 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -67,13 +67,17 @@
  #define VIRTIO_F_VERSION_1		32
/*
- * If clear - device has the IOMMU bypass quirk feature.
- * If set - use platform tools to detect the IOMMU.
+ * If clear - device has the platform DMA (e.g. IOMMU) bypass quirk feature.
+ * If set - use platform DMA tools to access the memory.
   *
   * Note the reverse polarity (compared to most other features),
   * this is for compatibility with legacy systems.
   */
-#define VIRTIO_F_IOMMU_PLATFORM		33
+#define VIRTIO_F_ACCESS_PLATFORM	33
+#ifndef __KERNEL__
+/* Legacy name for VIRTIO_F_ACCESS_PLATFORM (for compatibility with old userspace) */
+#define VIRTIO_F_IOMMU_PLATFORM		VIRTIO_F_ACCESS_PLATFORM
+#endif /* __KERNEL__ */
/* This feature indicates support for the packed virtqueue layout. */
  #define VIRTIO_F_RING_PACKED		34
diff --git a/tools/virtio/linux/virtio_config.h b/tools/virtio/linux/virtio_config.h
index dbf14c1e2188..f99ae42668e0 100644
--- a/tools/virtio/linux/virtio_config.h
+++ b/tools/virtio/linux/virtio_config.h
@@ -51,7 +51,7 @@ static inline bool virtio_has_iommu_quirk(const struct virtio_device *vdev)
  	 * Note the reverse polarity of the quirk feature (compared to most
  	 * other features), this is for compatibility with legacy systems.
  	 */
-	return !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
+	return !virtio_has_feature(vdev, VIRTIO_F_ACCESS_PLATFORM);
  }
static inline bool virtio_is_little_endian(struct virtio_device *vdev)


Acked-by: Jason Wang <jasowang@xxxxxxxxxx>





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