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.

Signed-off-by: Changqi Lu <luchangqi.123@bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
---
 hw/nvme/ctrl.c | 3 ++-
 hw/nvme/ns.c   | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 127c3d2383..182307a48b 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_RESRVATIONS);
 
     /*
      * 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..320c9bf658 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)->file->bs->bl.pr_cap;
+    id_ns->rescap = block_pr_cap_to_nvme(blk_pr_cap);
 }
 
 static int nvme_ns_init(NvmeNamespace *ns, Error **errp)
-- 
2.20.1