[dpdk-dev] [PATCH v2 2/2] vhost: unmap log memory on cleanup.

[Ilya Maximets]

Fixes memory leak on QEMU migration.

Fixes: 54f9e32305d4 ("vhost: handle dirty pages logging request")
Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
---
 lib/librte_vhost/vhost-net.h                  |  1 +
 lib/librte_vhost/vhost_user/virtio-net-user.c | 15 +++++++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/lib/librte_vhost/vhost-net.h b/lib/librte_vhost/vhost-net.h
index ec8f964..38593a2 100644
--- a/lib/librte_vhost/vhost-net.h
+++ b/lib/librte_vhost/vhost-net.h
@@ -134,6 +134,7 @@ struct virtio_net {
        char                    ifname[IF_NAME_SZ];
        uint64_t                log_size;
        uint64_t                log_base;
+       uint64_t                log_addr;
        struct ether_addr       mac;

 } __rte_cache_aligned;
diff --git a/lib/librte_vhost/vhost_user/virtio-net-user.c 
b/lib/librte_vhost/vhost_user/virtio-net-user.c
index e6a2aed..a867a43 100644
--- a/lib/librte_vhost/vhost_user/virtio-net-user.c
+++ b/lib/librte_vhost/vhost_user/virtio-net-user.c
@@ -95,6 +95,10 @@ vhost_backend_cleanup(struct virtio_net *dev)
                free(dev->mem);
                dev->mem = NULL;
        }
+       if (dev->log_addr) {
+               munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
+               dev->log_addr = 0;
+       }
 }

 int
@@ -407,8 +411,15 @@ user_set_log_base(int vid, struct VhostUserMsg *msg)
                return -1;
        }

-       /* TODO: unmap on stop */
-       dev->log_base = (uint64_t)(uintptr_t)addr + off;
+       /*
+        * Free previously mapped log memory on occasionally
+        * multiple VHOST_USER_SET_LOG_BASE.
+        */
+       if (dev->log_addr) {
+               munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
+       }
+       dev->log_addr = (uint64_t)(uintptr_t)addr;
+       dev->log_base = dev->log_addr + off;
        dev->log_size = size;

        return 0;
-- 
2.7.4