This commit enables ONCS to support the reservation
function at the controller level. Also enables rescap
function in the namespace by detecting the supported reservation
function in the backend driver.

Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Signed-off-by: Changqi Lu <luchangqi.123@bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 hw/nvme/ctrl.c       | 3 ++-
 hw/nvme/ns.c         | 5 +++++
 include/block/nvme.h | 2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 127c3d2383..ad212de723 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -8248,7 +8248,8 @@ static void nvme_init_ctrl(NvmeCtrl *n, PCIDevice *pci_dev)
     id->nn = cpu_to_le32(NVME_MAX_NAMESPACES);
     id->oncs = cpu_to_le16(NVME_ONCS_WRITE_ZEROES | NVME_ONCS_TIMESTAMP |
                            NVME_ONCS_FEATURES | NVME_ONCS_DSM |
-                           NVME_ONCS_COMPARE | NVME_ONCS_COPY);
+                           NVME_ONCS_COMPARE | NVME_ONCS_COPY |
+                           NVME_ONCS_RESERVATIONS);
 
     /*
      * NOTE: If this device ever supports a command set that does NOT use 0x0
diff --git a/hw/nvme/ns.c b/hw/nvme/ns.c
index ea8db175db..a5c903d727 100644
--- a/hw/nvme/ns.c
+++ b/hw/nvme/ns.c
@@ -20,6 +20,7 @@
 #include "qemu/bitops.h"
 #include "sysemu/sysemu.h"
 #include "sysemu/block-backend.h"
+#include "block/block_int.h"
 
 #include "nvme.h"
 #include "trace.h"
@@ -33,6 +34,7 @@ void nvme_ns_init_format(NvmeNamespace *ns)
     BlockDriverInfo bdi;
     int npdg, ret;
     int64_t nlbas;
+    uint8_t blk_pr_cap;
 
     ns->lbaf = id_ns->lbaf[NVME_ID_NS_FLBAS_INDEX(id_ns->flbas)];
     ns->lbasz = 1 << ns->lbaf.ds;
@@ -55,6 +57,9 @@ void nvme_ns_init_format(NvmeNamespace *ns)
     }
 
     id_ns->npda = id_ns->npdg = npdg - 1;
+
+    blk_pr_cap = blk_bs(ns->blkconf.blk)->bl.pr_cap;
+    id_ns->rescap = block_pr_cap_to_nvme(blk_pr_cap);
 }
 
 static int nvme_ns_init(NvmeNamespace *ns, Error **errp)
diff --git a/include/block/nvme.h b/include/block/nvme.h
index 8b125f7769..9b9eaeb3a7 100644
--- a/include/block/nvme.h
+++ b/include/block/nvme.h
@@ -1251,7 +1251,7 @@ enum NvmeIdCtrlOncs {
     NVME_ONCS_DSM           = 1 << 2,
     NVME_ONCS_WRITE_ZEROES  = 1 << 3,
     NVME_ONCS_FEATURES      = 1 << 4,
-    NVME_ONCS_RESRVATIONS   = 1 << 5,
+    NVME_ONCS_RESERVATIONS  = 1 << 5,
     NVME_ONCS_TIMESTAMP     = 1 << 6,
     NVME_ONCS_VERIFY        = 1 << 7,
     NVME_ONCS_COPY          = 1 << 8,
-- 
2.20.1