libqos: add qvirtqueue_cleanup()

qvirtqueue_setup() allocates the vring and virtqueue state.  So far
there has been no function to free it.  Callers have been using
guest_free() for the vring but forgot to free the QVirtQueue state.

This patch solves the memory leak by introducing qvirtqueue_cleanup().

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

4 files changed, 29 insertions, 0 deletions

diff --git a/tests/libqos/virtio-mmio.c b/tests/libqos/virtio-mmio.c
index ccb92d9eef..0cab38f296 100644
--- a/tests/libqos/virtio-mmio.c
+++ b/tests/libqos/virtio-mmio.c
@@ -154,6 +154,13 @@ static QVirtQueue *qvirtio_mmio_virtqueue_setup(QVirtioDevice *d,
     return vq;
 }
 
+static void qvirtio_mmio_virtqueue_cleanup(QVirtQueue *vq,
+                                           QGuestAllocator *alloc)
+{
+    guest_free(alloc, vq->desc);
+    g_free(vq);
+}
+
 static void qvirtio_mmio_virtqueue_kick(QVirtioDevice *d, QVirtQueue *vq)
 {
     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
@@ -176,6 +183,7 @@ const QVirtioBus qvirtio_mmio = {
     .get_queue_size = qvirtio_mmio_get_queue_size,
     .set_queue_address = qvirtio_mmio_set_queue_address,
     .virtqueue_setup = qvirtio_mmio_virtqueue_setup,
+    .virtqueue_cleanup = qvirtio_mmio_virtqueue_cleanup,
     .virtqueue_kick = qvirtio_mmio_virtqueue_kick,
 };
 
diff --git a/tests/libqos/virtio-pci.c b/tests/libqos/virtio-pci.c
index 3b2b59bcf8..18b92b95dc 100644
--- a/tests/libqos/virtio-pci.c
+++ b/tests/libqos/virtio-pci.c
@@ -235,6 +235,15 @@ static QVirtQueue *qvirtio_pci_virtqueue_setup(QVirtioDevice *d,
     return &vqpci->vq;
 }
 
+static void qvirtio_pci_virtqueue_cleanup(QVirtQueue *vq,
+                                          QGuestAllocator *alloc)
+{
+    QVirtQueuePCI *vqpci = container_of(vq, QVirtQueuePCI, vq);
+
+    guest_free(alloc, vq->desc);
+    g_free(vqpci);
+}
+
 static void qvirtio_pci_virtqueue_kick(QVirtioDevice *d, QVirtQueue *vq)
 {
     QVirtioPCIDevice *dev = (QVirtioPCIDevice *)d;
@@ -257,6 +266,7 @@ const QVirtioBus qvirtio_pci = {
     .get_queue_size = qvirtio_pci_get_queue_size,
     .set_queue_address = qvirtio_pci_set_queue_address,
     .virtqueue_setup = qvirtio_pci_virtqueue_setup,
+    .virtqueue_cleanup = qvirtio_pci_virtqueue_cleanup,
     .virtqueue_kick = qvirtio_pci_virtqueue_kick,
 };
 
diff --git a/tests/libqos/virtio.c b/tests/libqos/virtio.c
index f79d2d14ec..d8c2970de7 100644
--- a/tests/libqos/virtio.c
+++ b/tests/libqos/virtio.c
@@ -54,6 +54,12 @@ QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d,
     return bus->virtqueue_setup(d, alloc, index);
 }
 
+void qvirtqueue_cleanup(const QVirtioBus *bus, QVirtQueue *vq,
+                        QGuestAllocator *alloc)
+{
+    return bus->virtqueue_cleanup(vq, alloc);
+}
+
 void qvirtio_reset(const QVirtioBus *bus, QVirtioDevice *d)
 {
     bus->set_status(d, 0);
diff --git a/tests/libqos/virtio.h b/tests/libqos/virtio.h
index c73fd8c24a..0250842bf2 100644
--- a/tests/libqos/virtio.h
+++ b/tests/libqos/virtio.h
@@ -79,6 +79,9 @@ typedef struct QVirtioBus {
     QVirtQueue *(*virtqueue_setup)(QVirtioDevice *d, QGuestAllocator *alloc,
                                                                 uint16_t index);
 
+    /* Free virtqueue resources */
+    void (*virtqueue_cleanup)(QVirtQueue *vq, QGuestAllocator *alloc);
+
     /* Notify changes in virtqueue */
     void (*virtqueue_kick)(QVirtioDevice *d, QVirtQueue *vq);
 } QVirtioBus;
@@ -118,6 +121,8 @@ void qvirtio_wait_config_isr(const QVirtioBus *bus, QVirtioDevice *d,
                              gint64 timeout_us);
 QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d,
                                         QGuestAllocator *alloc, uint16_t index);
+void qvirtqueue_cleanup(const QVirtioBus *bus, QVirtQueue *vq,
+                        QGuestAllocator *alloc);
 
 void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr);
 QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,