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authorKlaus Jensen <k.jensen@samsung.com>2021-04-08 12:44:05 +0200
committerKlaus Jensen <k.jensen@samsung.com>2021-04-12 08:55:23 +0200
commit98f84f5a4eca5c03e32fff20f246d9b4b96d6422 (patch)
treeec61626791e6de659028d7d81dcdbd2adb183672
parent5cefe2870874e6442eba62408bedbb4338b183a3 (diff)
downloadqemu-arm-98f84f5a4eca5c03e32fff20f246d9b4b96d6422.tar.gz
hw/block/nvme: drain namespaces on sq deletion
For most commands, when issuing an AIO, the BlockAIOCB is stored in the NvmeRequest aiocb pointer when the AIO is issued. The main use of this is cancelling AIOs when deleting submission queues (it is currently not used for Abort). However, some commands like Dataset Management Zone Management Send (zone reset) may involve more than one AIO and here the AIOs are issued without saving a reference to the BlockAIOCB. This is a problem since nvme_del_sq() will attempt to cancel outstanding AIOs, potentially with an invalid BlockAIOCB since the aiocb pointer is not NULL'ed when the request structure is recycled. Fix this by 1. making sure the aiocb pointer is NULL'ed when requests are recycled 2. only attempt to cancel the AIO if the aiocb is non-NULL 3. if any AIOs could not be cancelled, drain all aio as a last resort. Fixes: dc04d25e2f3f ("hw/block/nvme: add support for the format nvm command") Fixes: c94973288cd9 ("hw/block/nvme: add broadcast nsid support flush command") Fixes: e4e430b3d6ba ("hw/block/nvme: add simple copy command") Fixes: 5f5dc4c6a942 ("hw/block/nvme: zero out zones on reset") Fixes: 2605257a26b8 ("hw/block/nvme: add the dataset management command") Cc: Gollu Appalanaidu <anaidu.gollu@samsung.com> Cc: Minwoo Im <minwoo.im@samsung.com> Signed-off-by: Klaus Jensen <k.jensen@samsung.com> Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
-rw-r--r--hw/block/nvme.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 65bb2cfc21..624a1431d0 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -470,6 +470,7 @@ static void nvme_req_clear(NvmeRequest *req)
{
req->ns = NULL;
req->opaque = NULL;
+ req->aiocb = NULL;
memset(&req->cqe, 0x0, sizeof(req->cqe));
req->status = NVME_SUCCESS;
}
@@ -3687,6 +3688,7 @@ static uint16_t nvme_del_sq(NvmeCtrl *n, NvmeRequest *req)
NvmeSQueue *sq;
NvmeCQueue *cq;
uint16_t qid = le16_to_cpu(c->qid);
+ uint32_t nsid;
if (unlikely(!qid || nvme_check_sqid(n, qid))) {
trace_pci_nvme_err_invalid_del_sq(qid);
@@ -3698,9 +3700,26 @@ static uint16_t nvme_del_sq(NvmeCtrl *n, NvmeRequest *req)
sq = n->sq[qid];
while (!QTAILQ_EMPTY(&sq->out_req_list)) {
r = QTAILQ_FIRST(&sq->out_req_list);
- assert(r->aiocb);
- blk_aio_cancel(r->aiocb);
+ if (r->aiocb) {
+ blk_aio_cancel(r->aiocb);
+ }
+ }
+
+ /*
+ * Drain all namespaces if there are still outstanding requests that we
+ * could not cancel explicitly.
+ */
+ if (!QTAILQ_EMPTY(&sq->out_req_list)) {
+ for (nsid = 1; nsid <= NVME_MAX_NAMESPACES; nsid++) {
+ NvmeNamespace *ns = nvme_ns(n, nsid);
+ if (ns) {
+ nvme_ns_drain(ns);
+ }
+ }
}
+
+ assert(QTAILQ_EMPTY(&sq->out_req_list));
+
if (!nvme_check_cqid(n, sq->cqid)) {
cq = n->cq[sq->cqid];
QTAILQ_REMOVE(&cq->sq_list, sq, entry);