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vhost: vdpa: report iova range

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This patch introduces a new ioctl for vhost-vdpa device that can
report the iova range by the device.

For device that implements get_iova_range() method, we fetch it from
the vDPA device. If device doesn't implement get_iova_range() but
depends on platform IOMMU, we will query via DOMAIN_ATTR_GEOMETRY,
otherwise [0, ULLONG_MAX] is assumed.

For safety, this patch also rules out the map request which is not in
the valid range.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20201023090043.14430-3-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2020-10-23 17:00:42 +08:00 • committed by Michael S. Tsirkin
parent 3f1b623a1b
commit 1b48dc03e5
3 changed files with 54 additions and 0 deletions
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4
include/uapi/linux/vhost.h
View file

@ -146,4 +146,8 @@
/* 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 _IOR(VHOST_VIRTIO, 0x78, \
struct vhost_vdpa_iova_range)
#endif

9
include/uapi/linux/vhost_types.h
View file

@ -138,6 +138,15 @@ struct vhost_vdpa_config {
__u8 buf[0];
};
/* vhost vdpa IOVA range
* @first: First address that can be mapped by vhost-vDPA
* @last: Last address that can be mapped by vhost-vDPA
*/
struct vhost_vdpa_iova_range {
__u64 first;
__u64 last;
};
/* Feature bits */
/* Log all write descriptors. Can be changed while device is active. */
#define VHOST_F_LOG_ALL 26