vhost: fix missing guest pages table NUMA realloc

When the guest allocates virtqueues on a different NUMA node
than the one the Vhost metadata are allocated, both the Vhost
device struct and the virtqueues struct are reallocated.

However, reallocating the guest pages table was missing, which
likely causes at least one cross-NUMA accesses for every burst
of packets.

This patch reallocates this table on the same NUMA node as the
other metadata.

Fixes: e246896178e6 ("vhost: get guest/host physical address mappings")
Cc: stable@dpdk.org
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index b5a84f3..5fb055e 100644 (file)
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -558,7 +558,8 @@ numa_realloc(struct virtio_net *dev, int index)
        }
        if (oldnode != newnode) {
                struct rte_vhost_memory *old_mem;
-               ssize_t mem_size;
+               struct guest_page *old_gp;
+               ssize_t mem_size, gp_size;
 
                VHOST_LOG_CONFIG(INFO,
                        "reallocate dev from %d to %d node\n",
@@ -583,6 +584,17 @@ numa_realloc(struct virtio_net *dev, int index)
 
                memcpy(dev->mem, old_mem, mem_size);
                rte_free(old_mem);
+
+               gp_size = dev->max_guest_pages * sizeof(*dev->guest_pages);
+               old_gp = dev->guest_pages;
+               dev->guest_pages = rte_malloc_socket(NULL, gp_size, RTE_CACHE_LINE_SIZE, newnode);
+               if (!dev->guest_pages) {
+                       dev->guest_pages = old_gp;
+                       goto out;
+               }
+
+               memcpy(dev->guest_pages, old_gp, gp_size);
+               rte_free(old_gp);
        }
 
 out: