[PATCH 02/17] block/nvme: Let nvme_create_queue_pair() fail gracefully

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

As nvme_create_queue_pair() is allowed to fail, replace the
alloc() calls by try_alloc() to avoid aborting QEMU.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 block/nvme.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/block/nvme.c b/block/nvme.c
index 1e5b40f61c..ec0dd21b6e 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -194,13 +194,21 @@ static NVMeQueuePair *nvme_create_queue_pair(BlockDriverState *bs,
     int i, r;
     BDRVNVMeState *s = bs->opaque;
     Error *local_err = NULL;
-    NVMeQueuePair *q = g_new0(NVMeQueuePair, 1);
+    NVMeQueuePair *q;
     uint64_t prp_list_iova;
 
+    q = g_try_new0(NVMeQueuePair, 1);
+    if (!q) {
+        return NULL;
+    }
+    q->prp_list_pages = qemu_try_blockalign0(bs,
+                                          s->page_size * NVME_QUEUE_SIZE);
+    if (!q->prp_list_pages) {
+        goto fail;
+    }
     qemu_mutex_init(&q->lock);
     q->index = idx;
     qemu_co_queue_init(&q->free_req_queue);
-    q->prp_list_pages = qemu_blockalign0(bs, s->page_size * NVME_QUEUE_SIZE);
     r = qemu_vfio_dma_map(s->vfio, q->prp_list_pages,
                           s->page_size * NVME_QUEUE_SIZE,
                           false, &prp_list_iova);
-- 
2.21.3