This patch introduces a new ioctl for vhost-vdpa device that can
report the iova range by the device. For device that depends on
platform IOMMU, we fetch the iova range via DOMAIN_ATTR_GEOMETRY. For
devices that has its own DMA translation unit, we fetch it directly
from vDPA bus operation.
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/vhost/vdpa.c | 27 +++++++++++++++++++++++++++
include/uapi/linux/vhost.h | 4 ++++
include/uapi/linux/vhost_types.h | 5 +++++
3 files changed, 36 insertions(+)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 77a0c9fb6cc3..ad23e66cbf57 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -332,6 +332,30 @@ static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp)
return 0;
}
+
+static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)
+{
+ struct iommu_domain_geometry geo;
+ struct vdpa_device *vdpa = v->vdpa;
+ const struct vdpa_config_ops *ops = vdpa->config;
+ struct vhost_vdpa_iova_range range;
+ struct vdpa_iova_range vdpa_range;
+
+ if (!ops->set_map && !ops->dma_map) {
+ iommu_domain_get_attr(v->domain,
+ DOMAIN_ATTR_GEOMETRY, &geo);
+ range.start = geo.aperture_start;
+ range.end = geo.aperture_end;
+ } else {
+ vdpa_range = ops->get_iova_range(vdpa);
+ range.start = vdpa_range.start;
+ range.end = vdpa_range.end;
+ }
+
+ return copy_to_user(argp, &range, sizeof(range));
+
+}
+
static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
void __user *argp)
{
@@ -442,6 +466,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
case VHOST_VDPA_SET_CONFIG_CALL:
r = vhost_vdpa_set_config_call(v, argp);
break;
+ case VHOST_VDPA_GET_IOVA_RANGE:
+ r = vhost_vdpa_get_iova_range(v, argp);
+ break;
default:
r = vhost_dev_ioctl(&v->vdev, cmd, argp);
if (r == -ENOIOCTLCMD)
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index 0c2349612e77..850956980e27 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -144,4 +144,8 @@
/* Set event fd for config interrupt*/
#define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, int)
+
+/* Get the valid iova range */
+#define VHOST_VDPA_GET_IOVA_RANGE _IOW(VHOST_VIRTIO, 0x78, \
+ struct vhost_vdpa_iova_range)
#endif
diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h
index 669457ce5c48..4025b5a36177 100644
--- a/include/uapi/linux/vhost_types.h
+++ b/include/uapi/linux/vhost_types.h
@@ -127,6 +127,11 @@ struct vhost_vdpa_config {
__u8 buf[0];
};
+struct vhost_vdpa_iova_range {
+ __u64 start;
+ __u64 end;
+};
+
/* Feature bits */
/* Log all write descriptors. Can be changed while device is active. */
#define VHOST_F_LOG_ALL 26
--
2.20.1
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