[RFC 25/27] vhost: add support for VDUSE IOTLB update event

[Maxime Coquelin]

This patch adds support for VDUSE_UPDATE_IOTLB event
handling, which consists in invaliding IOTLB entries for
the range specified in the request.

Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
---
 lib/vhost/vduse.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c
index 7d59a5f709..b5b9fa2eb1 100644
--- a/lib/vhost/vduse.c
+++ b/lib/vhost/vduse.c
@@ -169,6 +169,12 @@ vduse_events_handler(int fd, void *arg, int *remove 
__rte_unused)
                dev->status = req.s.status;
                resp.result = VDUSE_REQ_RESULT_OK;
                break;
+       case VDUSE_UPDATE_IOTLB:
+               VHOST_LOG_CONFIG(dev->ifname, INFO, "\tIOVA range: %" PRIx64 " 
- %" PRIx64 "\n",
+                               (uint64_t)req.iova.start, 
(uint64_t)req.iova.last);
+               vhost_user_iotlb_cache_remove(dev, req.iova.start,
+                               req.iova.last - req.iova.start + 1);
+               break;
        default:
                resp.result = VDUSE_REQ_RESULT_FAILED;
                break;
-- 
2.39.2