[dpdk-dev] [PATCH 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/rte_virtio_net.h             |  3 ++-
 lib/librte_vhost/vhost_user/virtio-net-user.c | 15 +++++++++++++--
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
index 600b20b..5ae5d58 100644
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -143,7 +143,8 @@ struct virtio_net {
 	uint64_t		log_base;	/**< Where dirty pages are logged */
 	struct ether_addr	mac;		/**< MAC address */
 	rte_atomic16_t		broadcast_rarp;	/**< A flag to tell if we need broadcast rarp packet */
-	uint64_t		reserved[61];	/**< Reserve some spaces for future extension. */
+	uint64_t		log_addr;	/**< Where log mapped. */
+	uint64_t		reserved[60];	/**< Reserve some spaces for future extension. */
 	struct vhost_virtqueue	*virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];	/**< Contains all virtqueue information. */
 } __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 a4e20b5..e765ce7 100644
--- a/lib/librte_vhost/vhost_user/virtio-net-user.c
+++ b/lib/librte_vhost/vhost_user/virtio-net-user.c
@@ -96,6 +96,10 @@ 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
@@ -403,8 +407,15 @@ user_set_log_base(struct vhost_device_ctx ctx,
 		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