[RFC v2 05/10] vhost: add ASID support to VDUSE IOTLB operations

Eugenio Pérez
2026-03-10T19:17:32Z

Make use of the newly introduced address space ID when
calling Vhost IOTLB API.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>

---
Eugenio Pérez changes:
* Use the new GET_FD2 ioctl.
* Adapt the entry.v1 accesses to new format
---
lib/vhost/vduse.c | 28 ++++++++++++++++++++++------
1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c
index bb3a4363baad..4e1920f9441e 100644
--- a/lib/vhost/vduse.c
+++ b/lib/vhost/vduse.c
@@ -71,7 +71,7 @@ vduse_iotlb_remove_notify(uint64_t addr, uint64_t offset, uint64_t size)
static int
vduse_iotlb_miss(struct virtio_net *dev, int asid, uint64_t iova, uint8_t perm __rte_unused)
{
- struct vduse_iotlb_entry entry;
+ struct vduse_iotlb_entry_v2 entry = {};
uint64_t size, page_size;
struct stat stat;
void *mmap_addr;
@@ -79,8 +79,9 @@ vduse_iotlb_miss(struct virtio_net *dev, int asid, uint64_t iova, uint8_t perm _

entry.start = iova;
entry.last = iova + 1;
+ entry.asid = asid;

- ret = ioctl(dev->vduse_dev_fd, VDUSE_IOTLB_GET_FD, &entry);
+ ret = ioctl(dev->vduse_dev_fd, VDUSE_IOTLB_GET_FD2, &entry);
if (ret < 0) {
VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to get IOTLB entry for 0x%" PRIx64,
iova);
@@ -90,6 +91,7 @@ vduse_iotlb_miss(struct virtio_net *dev, int asid, uint64_t iova, uint8_t perm _
fd = ret;

VHOST_CONFIG_LOG(dev->ifname, DEBUG, "New IOTLB entry:");
+ VHOST_CONFIG_LOG(dev->ifname, DEBUG, "\tASID: %d", entry.asid);
VHOST_CONFIG_LOG(dev->ifname, DEBUG, "\tIOVA: %" PRIx64 " - %" PRIx64,
(uint64_t)entry.start, (uint64_t)entry.last);
VHOST_CONFIG_LOG(dev->ifname, DEBUG, "\toffset: %" PRIx64, (uint64_t)entry.offset);
@@ -458,10 +460,24 @@ vduse_events_handler(int fd, void *arg, int *close __rte_unused)
resp.result = VDUSE_REQ_RESULT_OK;
break;
case VDUSE_UPDATE_IOTLB:
- VHOST_CONFIG_LOG(dev->ifname, INFO, "\tIOVA range: %" PRIx64 " - %" PRIx64,
- (uint64_t)req.iova.start, (uint64_t)req.iova.last);
- vhost_user_iotlb_cache_remove(dev, 0, req.iova.start,
- req.iova.last - req.iova.start + 1); /* ToDo: use ASID once API available, using 0 for now */
+ {
+ uint64_t start, last;
+ uint32_t asid;
+
+ if (dev->vduse_api_ver < 1) {
+ start = req.iova.start;
+ last = req.iova.last;
+ asid = 0;
+ } else {
+ start = req.iova_v2.start;
+ last = req.iova_v2.last;
+ asid = req.iova_v2.asid;
+ }
+
+ VHOST_CONFIG_LOG(dev->ifname, INFO, "\t(ASID %d) IOVA range: %" PRIx64 " - %" PRIx64,
+ asid, start, last);
+ vhost_user_iotlb_cache_remove(dev, asid, start, last - start + 1);
+ }
resp.result = VDUSE_REQ_RESULT_OK;
break;
case VDUSE_SET_VQ_GROUP_ASID:
--
2.53.0