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

[Ilya Maximets <i.maximets@samsung.com>]

Fixes memory leak on QEMU migration.

Fixes: 54f9e32305d4 ("vhost: handle dirty pages logging request")
Signed-off-by: Ilya Maximets <i.maximets@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