[PATCH v3 09/16] block/nvme: Replace qemu_try_blockalign0 by qemu_try_blockalign/memset

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

In the next commit we'll get rid of qemu_try_blockalign().
To ease review, first replace qemu_try_blockalign0() by explicit
calls to qemu_try_blockalign() and memset().

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 block/nvme.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/block/nvme.c b/block/nvme.c
index a611fdd71e..9c118c000d 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -174,12 +174,12 @@ static void nvme_init_queue(BlockDriverState *bs, NVMeQueue *q,
 
     bytes = ROUND_UP(nentries * entry_bytes, s->page_size);
     q->head = q->tail = 0;
-    q->queue = qemu_try_blockalign0(bs, bytes);
-
+    q->queue = qemu_try_blockalign(bs, bytes);
     if (!q->queue) {
         error_setg(errp, "Cannot allocate queue");
         return;
     }
+    memset(q->queue, 0, bytes);
     r = qemu_vfio_dma_map(s->vfio, q->queue, bytes, false, &q->iova);
     if (r) {
         error_setg(errp, "Cannot map queue");
@@ -223,11 +223,12 @@ static NVMeQueuePair *nvme_create_queue_pair(BlockDriverState *bs,
     if (!q) {
         return NULL;
     }
-    q->prp_list_pages = qemu_try_blockalign0(bs,
+    q->prp_list_pages = qemu_try_blockalign(bs,
                                           s->page_size * NVME_QUEUE_SIZE);
     if (!q->prp_list_pages) {
         goto fail;
     }
+    memset(q->prp_list_pages, 0, s->page_size * NVME_QUEUE_SIZE);
     qemu_mutex_init(&q->lock);
     q->s = s;
     q->index = idx;
@@ -521,7 +522,7 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp)
         .cdw10 = cpu_to_le32(0x1),
     };
 
-    id = qemu_try_blockalign0(bs, sizeof(*id));
+    id = qemu_try_blockalign(bs, sizeof(*id));
     if (!id) {
         error_setg(errp, "Cannot allocate buffer for identify response");
         goto out;
@@ -531,8 +532,9 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp)
         error_setg(errp, "Cannot map buffer for DMA");
         goto out;
     }
-    cmd.prp1 = cpu_to_le64(iova);
 
+    memset(id, 0, sizeof(*id));
+    cmd.prp1 = cpu_to_le64(iova);
     if (nvme_cmd_sync(bs, s->queues[QUEUE_INDEX_ADMIN], &cmd)) {
         error_setg(errp, "Failed to identify controller");
         goto out;
@@ -1283,11 +1285,11 @@ static int coroutine_fn nvme_co_pdiscard(BlockDriverState *bs,
 
     assert(s->nr_queues > 1);
 
-    buf = qemu_try_blockalign0(bs, s->page_size);
+    buf = qemu_try_blockalign(bs, s->page_size);
     if (!buf) {
         return -ENOMEM;
     }
-
+    memset(buf, 0, s->page_size);
     buf->nlb = cpu_to_le32(bytes >> s->blkshift);
     buf->slba = cpu_to_le64(offset >> s->blkshift);
     buf->cattr = 0;
-- 
2.21.3