[PATCH RFC 10/15] hw/virtio/vhost-shadow-virtqueue: range boundary in translation

iova-tree expects inclusive range sizing when maps are allocated or searched.
Currently, svqs use exclusive sizing when searching their
vhost-iova-tree for a match to the region to be translated.  This could
lead to errors if the region to be translated is at the edge of an iova
region.

Fix this by reducing `needle.size` by 1 in
vhost_svq_translate_addr to bring then it line with DMAMap and iova-tree
convention.

Signed-off-by: Connor Kite <[email protected]>
---
 hw/virtio/vhost-shadow-virtqueue.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c
index 9e3c359f50..20e5c7d2f1 100644
--- a/hw/virtio/vhost-shadow-virtqueue.c
+++ b/hw/virtio/vhost-shadow-virtqueue.c
@@ -104,14 +104,14 @@ static bool vhost_svq_translate_addr(const VhostShadowVirtqueue *svq,
             /* Search the GPA->IOVA tree */
             needle = (DMAMap) {
                 .translated_addr = gpas[i],
-                .size = iovec[i].iov_len,
+                .size = iovec[i].iov_len - 1,  /* Inclusive */
             };
             map = vhost_iova_tree_find_gpa(svq->iova_tree, &needle);
         } else {
             /* Search the IOVA->HVA tree */
             needle = (DMAMap) {
                 .translated_addr = (hwaddr)(uintptr_t)iovec[i].iov_base,
-                .size = iovec[i].iov_len,
+                .size = iovec[i].iov_len - 1, /* Inclusive */
             };
             map = vhost_iova_tree_find_iova(svq->iova_tree, &needle);
         }

-- 
2.43.0