[RFC 20/27] vhost: add VDUSE callback for IOTLB entry removal

[Maxime Coquelin]

This patch implements the VDUSE callback for IOTLB misses,
where it unmaps the pages from the invalidated IOTLB entry

Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
---
 lib/vhost/vduse.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c
index f46823f589..ff4c9e72f1 100644
--- a/lib/vhost/vduse.c
+++ b/lib/vhost/vduse.c
@@ -32,6 +32,12 @@
                                (1ULL << VIRTIO_F_IN_ORDER) | \
                                (1ULL << VIRTIO_F_IOMMU_PLATFORM))
 
+static void
+vduse_iotlb_remove_notify(uint64_t addr, uint64_t offset, uint64_t size)
+{
+       munmap((void *)(uintptr_t)addr, offset + size);
+}
+
 static int
 vduse_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm 
__rte_unused)
 {
@@ -89,6 +95,7 @@ vduse_iotlb_miss(struct virtio_net *dev, uint64_t iova, 
uint8_t perm __rte_unuse
 
 static struct vhost_backend_ops vduse_backend_ops = {
        .iotlb_miss = vduse_iotlb_miss,
+       .iotlb_remove_notify = vduse_iotlb_remove_notify,
 };
 
 int
-- 
2.39.2