[dpdk-dev] [PATCH v2] vhost: fix vhost user virtqueue not accessible

[Marvin Liu <yong.liu@intel.com>]

Log feature is disabled in vhost user, so that log address was invalid
when checking. Check whether log address is valid can workaround it.
Also log address should be translated in packed ring virtqueue.

Fixes: 04cfc7fdbfca ("vhost: translate incoming log address to gpa")

Signed-off-by: Marvin Liu <yong.liu@intel.com>
---
 lib/librte_vhost/vhost_user.c | 30 +++++++++++++-----------------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 61ef699ac..759cc795c 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -641,11 +641,23 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
 	struct vhost_vring_addr *addr = &vq->ring_addrs;
 	uint64_t len, expected_len;
 
+	dev = numa_realloc(dev, vq_index);
+	vq = dev->virtqueue[vq_index];
+	if (addr->log_guest_addr) {
+		vq->log_guest_addr =
+			translate_log_addr(dev, vq, addr->log_guest_addr);
+		if (vq->log_guest_addr == 0) {
+			RTE_LOG(DEBUG, VHOST_CONFIG,
+					"(%d) failed to map log_guest_addr.\n",
+					dev->vid);
+			return dev;
+		}
+	}
+
 	if (vq_is_packed(dev)) {
 		len = sizeof(struct vring_packed_desc) * vq->size;
 		vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
 			ring_addr_to_vva(dev, vq, addr->desc_user_addr, &len);
-		vq->log_guest_addr = 0;
 		if (vq->desc_packed == NULL ||
 				len != sizeof(struct vring_packed_desc) *
 				vq->size) {
@@ -655,10 +667,6 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
 			return dev;
 		}
 
-		dev = numa_realloc(dev, vq_index);
-		vq = dev->virtqueue[vq_index];
-		addr = &vq->ring_addrs;
-
 		len = sizeof(struct vring_packed_desc_event);
 		vq->driver_event = (struct vring_packed_desc_event *)
 					(uintptr_t)ring_addr_to_vva(dev,
@@ -701,10 +709,6 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
 		return dev;
 	}
 
-	dev = numa_realloc(dev, vq_index);
-	vq = dev->virtqueue[vq_index];
-	addr = &vq->ring_addrs;
-
 	len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
 	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 		len += sizeof(uint16_t);
@@ -741,14 +745,6 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
 		vq->last_avail_idx = vq->used->idx;
 	}
 
-	vq->log_guest_addr =
-		translate_log_addr(dev, vq, addr->log_guest_addr);
-	if (vq->log_guest_addr == 0) {
-		RTE_LOG(DEBUG, VHOST_CONFIG,
-			"(%d) failed to map log_guest_addr .\n",
-			dev->vid);
-		return dev;
-	}
 	vq->access_ok = 1;
 
 	VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
-- 
2.17.1