[PATCH for-6.0 0/7] hw/block/nvme: misc fixes

[PATCH for-6.0 0/7] hw/block/nvme: misc fixes

[Klaus Jensen]

From: Klaus Jensen <k.jensen@samsung.com>

Various fixes for 6.0.

Klaus Jensen (7):
  hw/block/nvme: fix pi constraint check
  hw/block/nvme: fix missing string representation for ns attachment
  hw/block/nvme: fix the nsid 'invalid' value
  hw/block/nvme: fix controller namespaces array indexing
  hw/block/nvme: fix warning about legacy namespace configuration
  hw/block/nvme: update dmsrl limit on namespace detachment
  hw/block/nvme: fix handling of private namespaces

 hw/block/nvme-ns.h     |  12 ++--
 hw/block/nvme-subsys.h |   7 +--
 hw/block/nvme.h        |  45 ++------------
 include/block/nvme.h   |   1 +
 hw/block/nvme-ns.c     |  76 ++++++++++++++++++++----
 hw/block/nvme-subsys.c |  28 ---------
 hw/block/nvme.c        | 131 ++++++++++++++++-------------------------
 hw/block/trace-events  |   1 -
 8 files changed, 129 insertions(+), 172 deletions(-)

-- 
2.31.0

[PATCH for-6.0 1/7] hw/block/nvme: fix pi constraint check

[Klaus Jensen]

From: Klaus Jensen <k.jensen@samsung.com>

Protection Information can only be enabled if there is at least 8 bytes
of metadata.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme-ns.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/block/nvme-ns.c b/hw/block/nvme-ns.c
index 7f8d139a8663..ca04ee1bacfb 100644
--- a/hw/block/nvme-ns.c
+++ b/hw/block/nvme-ns.c
@@ -394,7 +394,7 @@ static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
         return -1;
     }
 
-    if (ns->params.pi && !ns->params.ms) {
+    if (ns->params.pi && ns->params.ms < 8) {
         error_setg(errp, "at least 8 bytes of metadata required to enable "
                    "protection information");
         return -1;
-- 
2.31.0

[PATCH for-6.0 2/7] hw/block/nvme: fix missing string representation for ns attachment

[Klaus Jensen]

From: Klaus Jensen <k.jensen@samsung.com>

Add the missing nvme_adm_opc_str entry for the Namespace Attachment
command.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index 5b0031b11db2..9edc86d79e98 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -86,6 +86,7 @@ static inline const char *nvme_adm_opc_str(uint8_t opc)
     case NVME_ADM_CMD_SET_FEATURES:     return "NVME_ADM_CMD_SET_FEATURES";
     case NVME_ADM_CMD_GET_FEATURES:     return "NVME_ADM_CMD_GET_FEATURES";
     case NVME_ADM_CMD_ASYNC_EV_REQ:     return "NVME_ADM_CMD_ASYNC_EV_REQ";
+    case NVME_ADM_CMD_NS_ATTACHMENT:    return "NVME_ADM_CMD_NS_ATTACHMENT";
     case NVME_ADM_CMD_FORMAT_NVM:       return "NVME_ADM_CMD_FORMAT_NVM";
     default:                            return "NVME_ADM_CMD_UNKNOWN";
     }
-- 
2.31.0

[PATCH for-6.0 3/7] hw/block/nvme: fix the nsid 'invalid' value

[Klaus Jensen]

From: Klaus Jensen <k.jensen@samsung.com>

The `nvme_nsid()` function returns '-1' (FFFFFFFFh) when the given
namespace is NULL. Since FFFFFFFFh is actually a valid namespace
identifier (the "broadcast" value), change this to be '0' since that
actually *is* the invalid value.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme-ns.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/block/nvme-ns.h b/hw/block/nvme-ns.h
index 9ab7894fc83e..82340c4b2574 100644
--- a/hw/block/nvme-ns.h
+++ b/hw/block/nvme-ns.h
@@ -96,7 +96,7 @@ static inline uint32_t nvme_nsid(NvmeNamespace *ns)
         return ns->params.nsid;
     }
 
-    return -1;
+    return 0;
 }
 
 static inline bool nvme_ns_shared(NvmeNamespace *ns)
-- 
2.31.0

[PATCH for-6.0 4/7] hw/block/nvme: fix controller namespaces array indexing

[Klaus Jensen]

From: Klaus Jensen <k.jensen@samsung.com>

The controller namespaces array being 0-indexed requires 'nsid - 1'
everywhere. Something that is easy to miss. Align the controller
namespaces array with the subsystem namespaces array such that both are
1-indexed.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme.h | 8 ++++----
 hw/block/nvme.c | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index 9edc86d79e98..c610ab30dc5c 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -217,7 +217,7 @@ typedef struct NvmeCtrl {
      * Attached namespaces to this controller.  If subsys is not given, all
      * namespaces in this list will always be attached.
      */
-    NvmeNamespace   *namespaces[NVME_MAX_NAMESPACES];
+    NvmeNamespace   *namespaces[NVME_MAX_NAMESPACES + 1];
     NvmeSQueue      **sq;
     NvmeCQueue      **cq;
     NvmeSQueue      admin_sq;
@@ -232,7 +232,7 @@ static inline NvmeNamespace *nvme_ns(NvmeCtrl *n, uint32_t nsid)
         return NULL;
     }
 
-    return n->namespaces[nsid - 1];
+    return n->namespaces[nsid];
 }
 
 static inline bool nvme_ns_is_attached(NvmeCtrl *n, NvmeNamespace *ns)
@@ -253,7 +253,7 @@ static inline void nvme_ns_attach(NvmeCtrl *n, NvmeNamespace *ns)
     uint32_t nsid = nvme_nsid(ns);
     assert(nsid && nsid <= NVME_MAX_NAMESPACES);
 
-    n->namespaces[nsid - 1] = ns;
+    n->namespaces[nsid] = ns;
 }
 
 static inline void nvme_ns_detach(NvmeCtrl *n, NvmeNamespace *ns)
@@ -261,7 +261,7 @@ static inline void nvme_ns_detach(NvmeCtrl *n, NvmeNamespace *ns)
     uint32_t nsid = nvme_nsid(ns);
     assert(nsid && nsid <= NVME_MAX_NAMESPACES);
 
-    n->namespaces[nsid - 1] = NULL;
+    n->namespaces[nsid] = NULL;
 }
 
 static inline NvmeCQueue *nvme_cq(NvmeRequest *req)
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 6842b01ab58b..7a7e793c6c26 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -5909,7 +5909,7 @@ int nvme_register_namespace(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
             return -1;
         }
     } else {
-        if (n->namespaces[nsid - 1]) {
+        if (n->namespaces[nsid]) {
             error_setg(errp, "namespace id '%d' is already in use", nsid);
             return -1;
         }
-- 
2.31.0

[PATCH for-6.0 5/7] hw/block/nvme: fix warning about legacy namespace configuration

[Klaus Jensen]

From: Klaus Jensen <k.jensen@samsung.com>

Remove the unused BlockConf from the controller structure and fix the
constraint checking to actually check the right BlockConf and issue the
warning.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme.h | 1 -
 hw/block/nvme.c | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index c610ab30dc5c..1570f65989a7 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -166,7 +166,6 @@ typedef struct NvmeCtrl {
     NvmeBar      bar;
     NvmeParams   params;
     NvmeBus      bus;
-    BlockConf    conf;
 
     uint16_t    cntlid;
     bool        qs_created;
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 7a7e793c6c26..403c8381a498 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -5807,7 +5807,7 @@ static void nvme_check_constraints(NvmeCtrl *n, Error **errp)
         params->max_ioqpairs = params->num_queues - 1;
     }
 
-    if (n->conf.blk) {
+    if (n->namespace.blkconf.blk) {
         warn_report("drive property is deprecated; "
                     "please use an nvme-ns device instead");
     }
-- 
2.31.0

[PATCH for-6.0 6/7] hw/block/nvme: update dmsrl limit on namespace detachment

[Klaus Jensen]

From: Klaus Jensen <k.jensen@samsung.com>

The Non-MDTS DMSRL limit must be recomputed when namespaces are
detached.

Fixes: 645ce1a70cb6 ("hw/block/nvme: support namespace attachment command")
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 403c8381a498..e84e43b2692d 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -4876,6 +4876,21 @@ static uint16_t nvme_aer(NvmeCtrl *n, NvmeRequest *req)
     return NVME_NO_COMPLETE;
 }
 
+static void __nvme_update_dmrsl(NvmeCtrl *n)
+{
+    int nsid;
+
+    for (nsid = 1; nsid <= NVME_MAX_NAMESPACES; nsid++) {
+        NvmeNamespace *ns = nvme_ns(n, nsid);
+        if (!ns) {
+            continue;
+        }
+
+        n->dmrsl = MIN_NON_ZERO(n->dmrsl,
+                                BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
+    }
+}
+
 static void __nvme_select_ns_iocs(NvmeCtrl *n, NvmeNamespace *ns);
 static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req)
 {
@@ -4925,6 +4940,8 @@ static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req)
             }
 
             nvme_ns_detach(ctrl, ns);
+
+            __nvme_update_dmrsl(ctrl);
         }
 
         /*
-- 
2.31.0

[PATCH for-6.0 7/7] hw/block/nvme: fix handling of private namespaces

[Klaus Jensen]

From: Klaus Jensen <k.jensen@samsung.com>

Prior to this patch, if a private nvme-ns device (that is, a namespace
that is not linked to a subsystem) is wired up to an nvme-subsys linked
nvme controller device, the device fails to verify that the namespace id
is unique within the subsystem. NVM Express v1.4b, Section 6.1.6 ("NSID
and Namespace Usage") states that because the device supports Namespace
Management, "NSIDs *shall* be unique within the NVM subsystem".

Additionally, prior to this patch, private namespaces are not known to
the subsystem and the namespace is considered exclusive to the
controller with which it is initially wired up to. However, this is not
the definition of a private namespace; per Section 1.6.33 ("private
namespace"), a private namespace is just a namespace that does not
support multipath I/O or namespace sharing, which means "that it is only
able to be attached to one controller at a time".

Fix this by always allocating namespaces in the subsystem (if one is
linked to the controller), regardsless of the shared/private status of
the namespace. Whether or not the namespace is shareable is controlled
by a new `shared` nvme-ns parameter.

Finally, this fix allows the nvme-ns `subsys` parameter to be removed,
since the `shared` parameter now serves the purpose of attaching the
namespace to all controllers in the subsystem upon device realization.
It is invalid to have an nvme-ns namespace device with a linked
subsystem without the parent nvme controller device also being linked to
one and since the nvme-ns devices will unconditionally be "attached" (in
QEMU terms that is) to an nvme controller device through an NvmeBus, the
nvme-ns namespace device can always get a reference to the subsystem of
the controller it is explicitly (using 'bus=' parametr) or implicitly
attaching to.

Fixes: e570768566b3 ("hw/block/nvme: support for shared namespace in subsystem")
Cc: Minwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme-ns.h     |  10 ++--
 hw/block/nvme-subsys.h |   7 ++-
 hw/block/nvme.h        |  39 +-------------
 include/block/nvme.h   |   1 +
 hw/block/nvme-ns.c     |  74 +++++++++++++++++++++++----
 hw/block/nvme-subsys.c |  28 -----------
 hw/block/nvme.c        | 112 +++++++++++++----------------------------
 hw/block/trace-events  |   1 -
 8 files changed, 106 insertions(+), 166 deletions(-)

diff --git a/hw/block/nvme-ns.h b/hw/block/nvme-ns.h
index 82340c4b2574..fb0a41f912e7 100644
--- a/hw/block/nvme-ns.h
+++ b/hw/block/nvme-ns.h
@@ -29,6 +29,7 @@ typedef struct NvmeZone {
 
 typedef struct NvmeNamespaceParams {
     bool     detached;
+    bool     shared;
     uint32_t nsid;
     QemuUUID uuid;
 
@@ -60,8 +61,8 @@ typedef struct NvmeNamespace {
     const uint32_t *iocs;
     uint8_t      csi;
     uint16_t     status;
+    int          attached;
 
-    NvmeSubsystem   *subsys;
     QTAILQ_ENTRY(NvmeNamespace) entry;
 
     NvmeIdNsZoned   *id_ns_zoned;
@@ -99,11 +100,6 @@ static inline uint32_t nvme_nsid(NvmeNamespace *ns)
     return 0;
 }
 
-static inline bool nvme_ns_shared(NvmeNamespace *ns)
-{
-    return !!ns->subsys;
-}
-
 static inline NvmeLBAF *nvme_ns_lbaf(NvmeNamespace *ns)
 {
     NvmeIdNs *id_ns = &ns->id_ns;
@@ -225,7 +221,7 @@ static inline void nvme_aor_dec_active(NvmeNamespace *ns)
 }
 
 void nvme_ns_init_format(NvmeNamespace *ns);
-int nvme_ns_setup(NvmeNamespace *ns, Error **errp);
+int nvme_ns_setup(NvmeCtrl *n, NvmeNamespace *ns, Error **errp);
 void nvme_ns_drain(NvmeNamespace *ns);
 void nvme_ns_shutdown(NvmeNamespace *ns);
 void nvme_ns_cleanup(NvmeNamespace *ns);
diff --git a/hw/block/nvme-subsys.h b/hw/block/nvme-subsys.h
index aafa04b84829..24132edd005c 100644
--- a/hw/block/nvme-subsys.h
+++ b/hw/block/nvme-subsys.h
@@ -14,7 +14,7 @@
     OBJECT_CHECK(NvmeSubsystem, (obj), TYPE_NVME_SUBSYS)
 
 #define NVME_SUBSYS_MAX_CTRLS   32
-#define NVME_SUBSYS_MAX_NAMESPACES  256
+#define NVME_MAX_NAMESPACES     256
 
 typedef struct NvmeCtrl NvmeCtrl;
 typedef struct NvmeNamespace NvmeNamespace;
@@ -24,7 +24,7 @@ typedef struct NvmeSubsystem {
 
     NvmeCtrl    *ctrls[NVME_SUBSYS_MAX_CTRLS];
     /* Allocated namespaces for this subsystem */
-    NvmeNamespace *namespaces[NVME_SUBSYS_MAX_NAMESPACES + 1];
+    NvmeNamespace *namespaces[NVME_MAX_NAMESPACES + 1];
 
     struct {
         char *nqn;
@@ -32,7 +32,6 @@ typedef struct NvmeSubsystem {
 } NvmeSubsystem;
 
 int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp);
-int nvme_subsys_register_ns(NvmeNamespace *ns, Error **errp);
 
 static inline NvmeCtrl *nvme_subsys_ctrl(NvmeSubsystem *subsys,
         uint32_t cntlid)
@@ -54,7 +53,7 @@ static inline NvmeNamespace *nvme_subsys_ns(NvmeSubsystem *subsys,
         return NULL;
     }
 
-    assert(nsid && nsid <= NVME_SUBSYS_MAX_NAMESPACES);
+    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
 
     return subsys->namespaces[nsid];
 }
diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index 1570f65989a7..644143597a0f 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -6,17 +6,9 @@
 #include "nvme-subsys.h"
 #include "nvme-ns.h"
 
-#define NVME_MAX_NAMESPACES 256
-
 #define NVME_DEFAULT_ZONE_SIZE   (128 * MiB)
 #define NVME_DEFAULT_MAX_ZA_SIZE (128 * KiB)
 
-/*
- * Subsystem namespace list for allocated namespaces should be larger than
- * attached namespace list in a controller.
- */
-QEMU_BUILD_BUG_ON(NVME_MAX_NAMESPACES > NVME_SUBSYS_MAX_NAMESPACES);
-
 typedef struct NvmeParams {
     char     *serial;
     uint32_t num_queues; /* deprecated since 5.1 */
@@ -234,35 +226,6 @@ static inline NvmeNamespace *nvme_ns(NvmeCtrl *n, uint32_t nsid)
     return n->namespaces[nsid];
 }
 
-static inline bool nvme_ns_is_attached(NvmeCtrl *n, NvmeNamespace *ns)
-{
-    int nsid;
-
-    for (nsid = 1; nsid <= n->num_namespaces; nsid++) {
-        if (nvme_ns(n, nsid) == ns) {
-            return true;
-        }
-    }
-
-    return false;
-}
-
-static inline void nvme_ns_attach(NvmeCtrl *n, NvmeNamespace *ns)
-{
-    uint32_t nsid = nvme_nsid(ns);
-    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
-
-    n->namespaces[nsid] = ns;
-}
-
-static inline void nvme_ns_detach(NvmeCtrl *n, NvmeNamespace *ns)
-{
-    uint32_t nsid = nvme_nsid(ns);
-    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
-
-    n->namespaces[nsid] = NULL;
-}
-
 static inline NvmeCQueue *nvme_cq(NvmeRequest *req)
 {
     NvmeSQueue *sq = req->sq;
@@ -291,7 +254,7 @@ typedef enum NvmeTxDirection {
     NVME_TX_DIRECTION_FROM_DEVICE = 1,
 } NvmeTxDirection;
 
-int nvme_register_namespace(NvmeCtrl *n, NvmeNamespace *ns, Error **errp);
+void nvme_attach_ns(NvmeCtrl *n, NvmeNamespace *ns);
 uint16_t nvme_bounce_data(NvmeCtrl *n, uint8_t *ptr, uint32_t len,
                           NvmeTxDirection dir, NvmeRequest *req);
 uint16_t nvme_bounce_mdata(NvmeCtrl *n, uint8_t *ptr, uint32_t len,
diff --git a/include/block/nvme.h b/include/block/nvme.h
index b0a4e4291611..4ac926fbc687 100644
--- a/include/block/nvme.h
+++ b/include/block/nvme.h
@@ -847,6 +847,7 @@ enum NvmeStatusCodes {
     NVME_FEAT_NOT_NS_SPEC       = 0x010f,
     NVME_FW_REQ_SUSYSTEM_RESET  = 0x0110,
     NVME_NS_ALREADY_ATTACHED    = 0x0118,
+    NVME_NS_PRIVATE             = 0x0119,
     NVME_NS_NOT_ATTACHED        = 0x011A,
     NVME_NS_CTRL_LIST_INVALID   = 0x011C,
     NVME_CONFLICTING_ATTRS      = 0x0180,
diff --git a/hw/block/nvme-ns.c b/hw/block/nvme-ns.c
index ca04ee1bacfb..aee43ba0b873 100644
--- a/hw/block/nvme-ns.c
+++ b/hw/block/nvme-ns.c
@@ -73,7 +73,7 @@ static int nvme_ns_init(NvmeNamespace *ns, Error **errp)
     /* support DULBE and I/O optimization fields */
     id_ns->nsfeat |= (0x4 | 0x10);
 
-    if (nvme_ns_shared(ns)) {
+    if (ns->params.shared) {
         id_ns->nmic |= NVME_NMIC_NS_SHARED;
     }
 
@@ -387,7 +387,8 @@ static void nvme_zoned_ns_shutdown(NvmeNamespace *ns)
     assert(ns->nr_open_zones == 0);
 }
 
-static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
+static int nvme_ns_check_constraints(NvmeCtrl *n, NvmeNamespace *ns,
+                                     Error **errp)
 {
     if (!ns->blkconf.blk) {
         error_setg(errp, "block backend not configured");
@@ -400,12 +401,32 @@ static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
         return -1;
     }
 
+    if (ns->params.nsid > NVME_MAX_NAMESPACES) {
+        error_setg(errp, "invalid namespace id (must be between 0 and %d)",
+                   NVME_MAX_NAMESPACES);
+        return -1;
+    }
+
+    if (!n->subsys) {
+        if (ns->params.detached) {
+            error_setg(errp, "detached requires that the nvme device is "
+                       "linked to an nvme-subsys device");
+            return -1;
+        }
+
+        if (ns->params.shared) {
+            error_setg(errp, "shared requires that the nvme device is "
+                       "linked to an nvme-subsys device");
+            return -1;
+        }
+    }
+
     return 0;
 }
 
-int nvme_ns_setup(NvmeNamespace *ns, Error **errp)
+int nvme_ns_setup(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
 {
-    if (nvme_ns_check_constraints(ns, errp)) {
+    if (nvme_ns_check_constraints(n, ns, errp)) {
         return -1;
     }
 
@@ -453,27 +474,60 @@ static void nvme_ns_realize(DeviceState *dev, Error **errp)
     NvmeNamespace *ns = NVME_NS(dev);
     BusState *s = qdev_get_parent_bus(dev);
     NvmeCtrl *n = NVME(s->parent);
+    NvmeSubsystem *subsys = n->subsys;
+    uint32_t nsid = ns->params.nsid;
+    int i;
 
-    if (nvme_ns_setup(ns, errp)) {
+    if (nvme_ns_setup(n, ns, errp)) {
         return;
     }
 
-    if (ns->subsys) {
-        if (nvme_subsys_register_ns(ns, errp)) {
+    if (!nsid) {
+        for (i = 1; i <= NVME_MAX_NAMESPACES; i++) {
+            if (!nvme_ns(n, i) || nvme_subsys_ns(subsys, i)) {
+                nsid = ns->params.nsid = i;
+                break;
+            }
+        }
+
+        if (!nsid) {
+            error_setg(errp, "no free namespace id");
             return;
         }
     } else {
-        if (nvme_register_namespace(n, ns, errp)) {
+        if (nvme_ns(n, nsid) || nvme_subsys_ns(subsys, nsid)) {
+            error_setg(errp, "namespace id '%d' already allocated", nsid);
             return;
         }
     }
+
+    if (subsys) {
+        subsys->namespaces[nsid] = ns;
+
+        if (ns->params.detached) {
+            return;
+        }
+
+        if (ns->params.shared) {
+            for (i = 0; i < ARRAY_SIZE(subsys->ctrls); i++) {
+                NvmeCtrl *ctrl = subsys->ctrls[i];
+
+                if (ctrl) {
+                    nvme_attach_ns(ctrl, ns);
+                }
+            }
+
+            return;
+        }
+    }
+
+    nvme_attach_ns(n, ns);
 }
 
 static Property nvme_ns_props[] = {
     DEFINE_BLOCK_PROPERTIES(NvmeNamespace, blkconf),
-    DEFINE_PROP_LINK("subsys", NvmeNamespace, subsys, TYPE_NVME_SUBSYS,
-                     NvmeSubsystem *),
     DEFINE_PROP_BOOL("detached", NvmeNamespace, params.detached, false),
+    DEFINE_PROP_BOOL("shared", NvmeNamespace, params.shared, false),
     DEFINE_PROP_UINT32("nsid", NvmeNamespace, params.nsid, 0),
     DEFINE_PROP_UUID("uuid", NvmeNamespace, params.uuid),
     DEFINE_PROP_UINT16("ms", NvmeNamespace, params.ms, 0),
diff --git a/hw/block/nvme-subsys.c b/hw/block/nvme-subsys.c
index 9fadef8cec99..283a97b79d57 100644
--- a/hw/block/nvme-subsys.c
+++ b/hw/block/nvme-subsys.c
@@ -43,34 +43,6 @@ int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp)
     return cntlid;
 }
 
-int nvme_subsys_register_ns(NvmeNamespace *ns, Error **errp)
-{
-    NvmeSubsystem *subsys = ns->subsys;
-    NvmeCtrl *n;
-    uint32_t nsid = nvme_nsid(ns);
-    int i;
-
-    assert(nsid && nsid <= NVME_SUBSYS_MAX_NAMESPACES);
-
-    if (subsys->namespaces[nsid]) {
-        error_setg(errp, "namespace %d already registerd to subsy %s",
-                   nvme_nsid(ns), subsys->parent_obj.id);
-        return -1;
-    }
-
-    subsys->namespaces[nsid] = ns;
-
-    for (i = 0; i < ARRAY_SIZE(subsys->ctrls); i++) {
-        n = subsys->ctrls[i];
-
-        if (n && nvme_register_namespace(n, ns, errp)) {
-            return -1;
-        }
-    }
-
-    return 0;
-}
-
 static void nvme_subsys_setup(NvmeSubsystem *subsys)
 {
     const char *nqn = subsys->params.nqn ?
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index e84e43b2692d..734a80dbd540 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -4250,7 +4250,7 @@ static uint16_t nvme_identify_ns_attached_list(NvmeCtrl *n, NvmeRequest *req)
             continue;
         }
 
-        if (!nvme_ns_is_attached(ctrl, ns)) {
+        if (!nvme_ns(ctrl, c->nsid)) {
             continue;
         }
 
@@ -4907,6 +4907,10 @@ static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req)
 
     trace_pci_nvme_ns_attachment(nvme_cid(req), dw10 & 0xf);
 
+    if (!nvme_nsid_valid(n, nsid)) {
+        return NVME_INVALID_NSID | NVME_DNR;
+    }
+
     ns = nvme_subsys_ns(n->subsys, nsid);
     if (!ns) {
         return NVME_INVALID_FIELD | NVME_DNR;
@@ -4928,18 +4932,23 @@ static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req)
         }
 
         if (attach) {
-            if (nvme_ns_is_attached(ctrl, ns)) {
+            if (nvme_ns(ctrl, nsid)) {
                 return NVME_NS_ALREADY_ATTACHED | NVME_DNR;
             }
 
-            nvme_ns_attach(ctrl, ns);
+            if (ns->attached && !ns->params.shared) {
+                return NVME_NS_PRIVATE | NVME_DNR;
+            }
+
+            nvme_attach_ns(ctrl, ns);
             __nvme_select_ns_iocs(ctrl, ns);
         } else {
-            if (!nvme_ns_is_attached(ctrl, ns)) {
+            if (!nvme_ns(ctrl, nsid)) {
                 return NVME_NS_NOT_ATTACHED | NVME_DNR;
             }
 
-            nvme_ns_detach(ctrl, ns);
+            ctrl->namespaces[nsid] = NULL;
+            ns->attached--;
 
             __nvme_update_dmrsl(ctrl);
         }
@@ -5827,6 +5836,12 @@ static void nvme_check_constraints(NvmeCtrl *n, Error **errp)
     if (n->namespace.blkconf.blk) {
         warn_report("drive property is deprecated; "
                     "please use an nvme-ns device instead");
+
+        if (n->subsys) {
+            error_setg(errp, "subsystem support is unavailable with legacy "
+                       "namespace ('drive' property)");
+            return;
+        }
     }
 
     if (params->max_ioqpairs < 1 ||
@@ -5889,75 +5904,6 @@ static void nvme_init_state(NvmeCtrl *n)
     n->aer_reqs = g_new0(NvmeRequest *, n->params.aerl + 1);
 }
 
-static int nvme_attach_namespace(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
-{
-    if (nvme_ns_is_attached(n, ns)) {
-        error_setg(errp,
-                   "namespace %d is already attached to controller %d",
-                   nvme_nsid(ns), n->cntlid);
-        return -1;
-    }
-
-    nvme_ns_attach(n, ns);
-
-    return 0;
-}
-
-int nvme_register_namespace(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
-{
-    uint32_t nsid = nvme_nsid(ns);
-
-    if (nsid > NVME_MAX_NAMESPACES) {
-        error_setg(errp, "invalid namespace id (must be between 0 and %d)",
-                   NVME_MAX_NAMESPACES);
-        return -1;
-    }
-
-    if (!nsid) {
-        for (int i = 1; i <= n->num_namespaces; i++) {
-            if (!nvme_ns(n, i)) {
-                nsid = ns->params.nsid = i;
-                break;
-            }
-        }
-
-        if (!nsid) {
-            error_setg(errp, "no free namespace id");
-            return -1;
-        }
-    } else {
-        if (n->namespaces[nsid]) {
-            error_setg(errp, "namespace id '%d' is already in use", nsid);
-            return -1;
-        }
-    }
-
-    trace_pci_nvme_register_namespace(nsid);
-
-    /*
-     * If subsys is not given, namespae is always attached to the controller
-     * because there's no subsystem to manage namespace allocation.
-     */
-    if (!n->subsys) {
-        if (ns->params.detached) {
-            error_setg(errp,
-                       "detached needs nvme-subsys specified nvme or nvme-ns");
-            return -1;
-        }
-
-        return nvme_attach_namespace(n, ns, errp);
-    } else {
-        if (!ns->params.detached) {
-            return nvme_attach_namespace(n, ns, errp);
-        }
-    }
-
-    n->dmrsl = MIN_NON_ZERO(n->dmrsl,
-                            BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
-
-    return 0;
-}
-
 static void nvme_init_cmb(NvmeCtrl *n, PCIDevice *pci_dev)
 {
     uint64_t cmb_size = n->params.cmb_size_mb * MiB;
@@ -6187,6 +6133,18 @@ static int nvme_init_subsys(NvmeCtrl *n, Error **errp)
     return 0;
 }
 
+void nvme_attach_ns(NvmeCtrl *n, NvmeNamespace *ns)
+{
+    uint32_t nsid = ns->params.nsid;
+    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
+
+    n->namespaces[nsid] = ns;
+    ns->attached++;
+
+    n->dmrsl = MIN_NON_ZERO(n->dmrsl,
+                            BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
+}
+
 static void nvme_realize(PCIDevice *pci_dev, Error **errp)
 {
     NvmeCtrl *n = NVME(pci_dev);
@@ -6218,13 +6176,11 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
         ns = &n->namespace;
         ns->params.nsid = 1;
 
-        if (nvme_ns_setup(ns, errp)) {
+        if (nvme_ns_setup(n, ns, errp)) {
             return;
         }
 
-        if (nvme_register_namespace(n, ns, errp)) {
-            return;
-        }
+        nvme_attach_ns(n, ns);
     }
 }
 
diff --git a/hw/block/trace-events b/hw/block/trace-events
index 22da06986d72..fa12e3a67a75 100644
--- a/hw/block/trace-events
+++ b/hw/block/trace-events
@@ -51,7 +51,6 @@ hd_geometry_guess(void *blk, uint32_t cyls, uint32_t heads, uint32_t secs, int t
 
 # nvme.c
 # nvme traces for successful events
-pci_nvme_register_namespace(uint32_t nsid) "nsid %"PRIu32""
 pci_nvme_irq_msix(uint32_t vector) "raising MSI-X IRQ vector %u"
 pci_nvme_irq_pin(void) "pulsing IRQ pin"
 pci_nvme_irq_masked(void) "IRQ is masked"
-- 
2.31.0

Re: [PATCH for-6.0 1/7] hw/block/nvme: fix pi constraint check

[Gollu Appalanaidu]

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On Wed, Mar 24, 2021 at 09:09:01PM +0100, Klaus Jensen wrote:
>From: Klaus Jensen <k.jensen@samsung.com>
>
>Protection Information can only be enabled if there is at least 8 bytes
>of metadata.
>
>Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
>---
> hw/block/nvme-ns.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/hw/block/nvme-ns.c b/hw/block/nvme-ns.c
>index 7f8d139a8663..ca04ee1bacfb 100644
>--- a/hw/block/nvme-ns.c
>+++ b/hw/block/nvme-ns.c
>@@ -394,7 +394,7 @@ static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
>         return -1;
>     }
>
>-    if (ns->params.pi && !ns->params.ms) {
>+    if (ns->params.pi && ns->params.ms < 8) {
and also it is good check that "metadata size" is power of 2 or not?

>         error_setg(errp, "at least 8 bytes of metadata required to enable "
>                    "protection information");
>         return -1;
>-- 
>2.31.0
>
>

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Re: [PATCH for-6.0 2/7] hw/block/nvme: fix missing string representation for ns attachment

[Gollu Appalanaidu]

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On Wed, Mar 24, 2021 at 09:09:02PM +0100, Klaus Jensen wrote:
>From: Klaus Jensen <k.jensen@samsung.com>
>
>Add the missing nvme_adm_opc_str entry for the Namespace Attachment
>command.
>
>Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
>---
> hw/block/nvme.h | 1 +
> 1 file changed, 1 insertion(+)
>
>diff --git a/hw/block/nvme.h b/hw/block/nvme.h
>index 5b0031b11db2..9edc86d79e98 100644
>--- a/hw/block/nvme.h
>+++ b/hw/block/nvme.h
>@@ -86,6 +86,7 @@ static inline const char *nvme_adm_opc_str(uint8_t opc)
>     case NVME_ADM_CMD_SET_FEATURES:     return "NVME_ADM_CMD_SET_FEATURES";
>     case NVME_ADM_CMD_GET_FEATURES:     return "NVME_ADM_CMD_GET_FEATURES";
>     case NVME_ADM_CMD_ASYNC_EV_REQ:     return "NVME_ADM_CMD_ASYNC_EV_REQ";
>+    case NVME_ADM_CMD_NS_ATTACHMENT:    return "NVME_ADM_CMD_NS_ATTACHMENT";
>     case NVME_ADM_CMD_FORMAT_NVM:       return "NVME_ADM_CMD_FORMAT_NVM";
>     default:                            return "NVME_ADM_CMD_UNKNOWN";
>     }
>--
Reviewed-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>
>2.31.0
>
>

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Re: [PATCH for-6.0 1/7] hw/block/nvme: fix pi constraint check

[Klaus Jensen]

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On Mar 29 19:52, Gollu Appalanaidu wrote:
> On Wed, Mar 24, 2021 at 09:09:01PM +0100, Klaus Jensen wrote:
> > From: Klaus Jensen <k.jensen@samsung.com>
> > 
> > Protection Information can only be enabled if there is at least 8 bytes
> > of metadata.
> > 
> > Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> > ---
> > hw/block/nvme-ns.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/hw/block/nvme-ns.c b/hw/block/nvme-ns.c
> > index 7f8d139a8663..ca04ee1bacfb 100644
> > --- a/hw/block/nvme-ns.c
> > +++ b/hw/block/nvme-ns.c
> > @@ -394,7 +394,7 @@ static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
> >         return -1;
> >     }
> > 
> > -    if (ns->params.pi && !ns->params.ms) {
> > +    if (ns->params.pi && ns->params.ms < 8) {
> and also it is good check that "metadata size" is power of 2 or not?
> 

While I don't expect a lot of real-world devices having metadata sizes
that are not power of twos, there is no requirement in the spec for
that.

And the implementation here also does not require it :)

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Re: [PATCH for-6.0 1/7] hw/block/nvme: fix pi constraint check

[Gollu Appalanaidu]

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On Tue, Mar 30, 2021 at 09:24:59AM +0200, Klaus Jensen wrote:
>On Mar 29 19:52, Gollu Appalanaidu wrote:
>> On Wed, Mar 24, 2021 at 09:09:01PM +0100, Klaus Jensen wrote:
>> > From: Klaus Jensen <k.jensen@samsung.com>
>> >
>> > Protection Information can only be enabled if there is at least 8 bytes
>> > of metadata.
>> >
>> > Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
>> > ---
>> > hw/block/nvme-ns.c | 2 +-
>> > 1 file changed, 1 insertion(+), 1 deletion(-)
>> >
>> > diff --git a/hw/block/nvme-ns.c b/hw/block/nvme-ns.c
>> > index 7f8d139a8663..ca04ee1bacfb 100644
>> > --- a/hw/block/nvme-ns.c
>> > +++ b/hw/block/nvme-ns.c
>> > @@ -394,7 +394,7 @@ static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
>> >         return -1;
>> >     }
>> >
>> > -    if (ns->params.pi && !ns->params.ms) {
>> > +    if (ns->params.pi && ns->params.ms < 8) {
>> and also it is good check that "metadata size" is power of 2 or not?
>>
>
>While I don't expect a lot of real-world devices having metadata sizes
>that are not power of twos, there is no requirement in the spec for
>that.
>
>And the implementation here also does not require it :)

Reviewed-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>

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Re: [PATCH for-6.0 6/7] hw/block/nvme: update dmsrl limit on namespace detachment

[Gollu Appalanaidu]

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On Wed, Mar 24, 2021 at 09:09:06PM +0100, Klaus Jensen wrote:
>From: Klaus Jensen <k.jensen@samsung.com>
>
>The Non-MDTS DMSRL limit must be recomputed when namespaces are
>detached.
>
>Fixes: 645ce1a70cb6 ("hw/block/nvme: support namespace attachment command")
>Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
>---
> hw/block/nvme.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
>diff --git a/hw/block/nvme.c b/hw/block/nvme.c
>index 403c8381a498..e84e43b2692d 100644
>--- a/hw/block/nvme.c
>+++ b/hw/block/nvme.c
>@@ -4876,6 +4876,21 @@ static uint16_t nvme_aer(NvmeCtrl *n, NvmeRequest *req)
>     return NVME_NO_COMPLETE;
> }
>
>+static void __nvme_update_dmrsl(NvmeCtrl *n)
>+{
>+    int nsid;
>+
>+    for (nsid = 1; nsid <= NVME_MAX_NAMESPACES; nsid++) {
>+        NvmeNamespace *ns = nvme_ns(n, nsid);
>+        if (!ns) {
>+            continue;
>+        }
>+
>+        n->dmrsl = MIN_NON_ZERO(n->dmrsl,
>+                                BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
>+    }
>+}
>+

Looks good to me!

> static void __nvme_select_ns_iocs(NvmeCtrl *n, NvmeNamespace *ns);
> static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req)
> {
>@@ -4925,6 +4940,8 @@ static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req)
>             }
>
>             nvme_ns_detach(ctrl, ns);
>+
>+            __nvme_update_dmrsl(ctrl);
>         }
>
>         /*
>-- 
>2.31.0
>
>

Reviwed-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>

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Re: [PATCH for-6.0 5/7] hw/block/nvme: fix warning about legacy namespace configuration

[Gollu Appalanaidu]

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On Wed, Mar 24, 2021 at 09:09:05PM +0100, Klaus Jensen wrote:
>From: Klaus Jensen <k.jensen@samsung.com>
>
>Remove the unused BlockConf from the controller structure and fix the
>constraint checking to actually check the right BlockConf and issue the
>warning.
>
>Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
>---
> hw/block/nvme.h | 1 -
> hw/block/nvme.c | 2 +-
> 2 files changed, 1 insertion(+), 2 deletions(-)
>
>diff --git a/hw/block/nvme.h b/hw/block/nvme.h
>index c610ab30dc5c..1570f65989a7 100644
>--- a/hw/block/nvme.h
>+++ b/hw/block/nvme.h
>@@ -166,7 +166,6 @@ typedef struct NvmeCtrl {
>     NvmeBar      bar;
>     NvmeParams   params;
>     NvmeBus      bus;
>-    BlockConf    conf;
>
>     uint16_t    cntlid;
>     bool        qs_created;
>diff --git a/hw/block/nvme.c b/hw/block/nvme.c
>index 7a7e793c6c26..403c8381a498 100644
>--- a/hw/block/nvme.c
>+++ b/hw/block/nvme.c
>@@ -5807,7 +5807,7 @@ static void nvme_check_constraints(NvmeCtrl *n, Error **errp)
>         params->max_ioqpairs = params->num_queues - 1;
>     }
>
>-    if (n->conf.blk) {
>+    if (n->namespace.blkconf.blk) {
>         warn_report("drive property is deprecated; "
>                     "please use an nvme-ns device instead");
>     }
>-- 
>2.31.0
>
>

Reviewed-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>

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Re: [PATCH for-6.0 0/7] hw/block/nvme: misc fixes

[Klaus Jensen]

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On Mar 24 21:09, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> Various fixes for 6.0.
> 
> Klaus Jensen (7):
>   hw/block/nvme: fix pi constraint check
>   hw/block/nvme: fix missing string representation for ns attachment
>   hw/block/nvme: fix the nsid 'invalid' value
>   hw/block/nvme: fix controller namespaces array indexing
>   hw/block/nvme: fix warning about legacy namespace configuration
>   hw/block/nvme: update dmsrl limit on namespace detachment
>   hw/block/nvme: fix handling of private namespaces
> 
>  hw/block/nvme-ns.h     |  12 ++--
>  hw/block/nvme-subsys.h |   7 +--
>  hw/block/nvme.h        |  45 ++------------
>  include/block/nvme.h   |   1 +
>  hw/block/nvme-ns.c     |  76 ++++++++++++++++++++----
>  hw/block/nvme-subsys.c |  28 ---------
>  hw/block/nvme.c        | 131 ++++++++++++++++-------------------------
>  hw/block/trace-events  |   1 -
>  8 files changed, 129 insertions(+), 172 deletions(-)
> 

Ping on patches [3,4,7/7] :)

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Re: [PATCH for-6.0 7/7] hw/block/nvme: fix handling of private namespaces

[Gollu Appalanaidu]

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On Wed, Mar 24, 2021 at 09:09:07PM +0100, Klaus Jensen wrote:
>From: Klaus Jensen <k.jensen@samsung.com>
>
>Prior to this patch, if a private nvme-ns device (that is, a namespace
>that is not linked to a subsystem) is wired up to an nvme-subsys linked
>nvme controller device, the device fails to verify that the namespace id
>is unique within the subsystem. NVM Express v1.4b, Section 6.1.6 ("NSID
>and Namespace Usage") states that because the device supports Namespace
>Management, "NSIDs *shall* be unique within the NVM subsystem".
>
>Additionally, prior to this patch, private namespaces are not known to
>the subsystem and the namespace is considered exclusive to the
>controller with which it is initially wired up to. However, this is not
>the definition of a private namespace; per Section 1.6.33 ("private
>namespace"), a private namespace is just a namespace that does not
>support multipath I/O or namespace sharing, which means "that it is only
>able to be attached to one controller at a time".
>
>Fix this by always allocating namespaces in the subsystem (if one is
>linked to the controller), regardsless of the shared/private status of
>the namespace. Whether or not the namespace is shareable is controlled
>by a new `shared` nvme-ns parameter.
>
>Finally, this fix allows the nvme-ns `subsys` parameter to be removed,
>since the `shared` parameter now serves the purpose of attaching the
>namespace to all controllers in the subsystem upon device realization.
>It is invalid to have an nvme-ns namespace device with a linked
>subsystem without the parent nvme controller device also being linked to
>one and since the nvme-ns devices will unconditionally be "attached" (in
>QEMU terms that is) to an nvme controller device through an NvmeBus, the
>nvme-ns namespace device can always get a reference to the subsystem of
>the controller it is explicitly (using 'bus=' parametr) or implicitly
>attaching to.
>
>Fixes: e570768566b3 ("hw/block/nvme: support for shared namespace in subsystem")
>Cc: Minwoo Im <minwoo.im.dev@gmail.com>
>Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
>---
> hw/block/nvme-ns.h     |  10 ++--
> hw/block/nvme-subsys.h |   7 ++-
> hw/block/nvme.h        |  39 +-------------
> include/block/nvme.h   |   1 +
> hw/block/nvme-ns.c     |  74 +++++++++++++++++++++++----
> hw/block/nvme-subsys.c |  28 -----------
> hw/block/nvme.c        | 112 +++++++++++++----------------------------
> hw/block/trace-events  |   1 -
> 8 files changed, 106 insertions(+), 166 deletions(-)
>
>diff --git a/hw/block/nvme-ns.h b/hw/block/nvme-ns.h
>index 82340c4b2574..fb0a41f912e7 100644
>--- a/hw/block/nvme-ns.h
>+++ b/hw/block/nvme-ns.h
>@@ -29,6 +29,7 @@ typedef struct NvmeZone {
>
> typedef struct NvmeNamespaceParams {
>     bool     detached;
>+    bool     shared;
>     uint32_t nsid;
>     QemuUUID uuid;
>
>@@ -60,8 +61,8 @@ typedef struct NvmeNamespace {
>     const uint32_t *iocs;
>     uint8_t      csi;
>     uint16_t     status;
>+    int          attached;
>
>-    NvmeSubsystem   *subsys;
>     QTAILQ_ENTRY(NvmeNamespace) entry;
>
>     NvmeIdNsZoned   *id_ns_zoned;
>@@ -99,11 +100,6 @@ static inline uint32_t nvme_nsid(NvmeNamespace *ns)
>     return 0;
> }
>
>-static inline bool nvme_ns_shared(NvmeNamespace *ns)
>-{
>-    return !!ns->subsys;
>-}
>-
> static inline NvmeLBAF *nvme_ns_lbaf(NvmeNamespace *ns)
> {
>     NvmeIdNs *id_ns = &ns->id_ns;
>@@ -225,7 +221,7 @@ static inline void nvme_aor_dec_active(NvmeNamespace *ns)
> }
>
> void nvme_ns_init_format(NvmeNamespace *ns);
>-int nvme_ns_setup(NvmeNamespace *ns, Error **errp);
>+int nvme_ns_setup(NvmeCtrl *n, NvmeNamespace *ns, Error **errp);
> void nvme_ns_drain(NvmeNamespace *ns);
> void nvme_ns_shutdown(NvmeNamespace *ns);
> void nvme_ns_cleanup(NvmeNamespace *ns);
>diff --git a/hw/block/nvme-subsys.h b/hw/block/nvme-subsys.h
>index aafa04b84829..24132edd005c 100644
>--- a/hw/block/nvme-subsys.h
>+++ b/hw/block/nvme-subsys.h
>@@ -14,7 +14,7 @@
>     OBJECT_CHECK(NvmeSubsystem, (obj), TYPE_NVME_SUBSYS)
>
> #define NVME_SUBSYS_MAX_CTRLS   32
>-#define NVME_SUBSYS_MAX_NAMESPACES  256
>+#define NVME_MAX_NAMESPACES     256
>
> typedef struct NvmeCtrl NvmeCtrl;
> typedef struct NvmeNamespace NvmeNamespace;
>@@ -24,7 +24,7 @@ typedef struct NvmeSubsystem {
>
>     NvmeCtrl    *ctrls[NVME_SUBSYS_MAX_CTRLS];
>     /* Allocated namespaces for this subsystem */
>-    NvmeNamespace *namespaces[NVME_SUBSYS_MAX_NAMESPACES + 1];
>+    NvmeNamespace *namespaces[NVME_MAX_NAMESPACES + 1];
>
>     struct {
>         char *nqn;
>@@ -32,7 +32,6 @@ typedef struct NvmeSubsystem {
> } NvmeSubsystem;
>
> int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp);
>-int nvme_subsys_register_ns(NvmeNamespace *ns, Error **errp);
>
> static inline NvmeCtrl *nvme_subsys_ctrl(NvmeSubsystem *subsys,
>         uint32_t cntlid)
>@@ -54,7 +53,7 @@ static inline NvmeNamespace *nvme_subsys_ns(NvmeSubsystem *subsys,
>         return NULL;
>     }
>
>-    assert(nsid && nsid <= NVME_SUBSYS_MAX_NAMESPACES);
>+    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
>
>     return subsys->namespaces[nsid];
> }
>diff --git a/hw/block/nvme.h b/hw/block/nvme.h
>index 1570f65989a7..644143597a0f 100644
>--- a/hw/block/nvme.h
>+++ b/hw/block/nvme.h
>@@ -6,17 +6,9 @@
> #include "nvme-subsys.h"
> #include "nvme-ns.h"
>
>-#define NVME_MAX_NAMESPACES 256
>-
> #define NVME_DEFAULT_ZONE_SIZE   (128 * MiB)
> #define NVME_DEFAULT_MAX_ZA_SIZE (128 * KiB)
>
>-/*
>- * Subsystem namespace list for allocated namespaces should be larger than
>- * attached namespace list in a controller.
>- */
>-QEMU_BUILD_BUG_ON(NVME_MAX_NAMESPACES > NVME_SUBSYS_MAX_NAMESPACES);
>-
> typedef struct NvmeParams {
>     char     *serial;
>     uint32_t num_queues; /* deprecated since 5.1 */
>@@ -234,35 +226,6 @@ static inline NvmeNamespace *nvme_ns(NvmeCtrl *n, uint32_t nsid)
>     return n->namespaces[nsid];
> }
>
>-static inline bool nvme_ns_is_attached(NvmeCtrl *n, NvmeNamespace *ns)
>-{
>-    int nsid;
>-
>-    for (nsid = 1; nsid <= n->num_namespaces; nsid++) {
>-        if (nvme_ns(n, nsid) == ns) {
>-            return true;
>-        }
>-    }
>-
>-    return false;
>-}
>-
>-static inline void nvme_ns_attach(NvmeCtrl *n, NvmeNamespace *ns)
>-{
>-    uint32_t nsid = nvme_nsid(ns);
>-    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
>-
>-    n->namespaces[nsid] = ns;
>-}
>-
>-static inline void nvme_ns_detach(NvmeCtrl *n, NvmeNamespace *ns)
>-{
>-    uint32_t nsid = nvme_nsid(ns);
>-    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
>-
>-    n->namespaces[nsid] = NULL;
>-}
>-
> static inline NvmeCQueue *nvme_cq(NvmeRequest *req)
> {
>     NvmeSQueue *sq = req->sq;
>@@ -291,7 +254,7 @@ typedef enum NvmeTxDirection {
>     NVME_TX_DIRECTION_FROM_DEVICE = 1,
> } NvmeTxDirection;
>
>-int nvme_register_namespace(NvmeCtrl *n, NvmeNamespace *ns, Error **errp);
>+void nvme_attach_ns(NvmeCtrl *n, NvmeNamespace *ns);
> uint16_t nvme_bounce_data(NvmeCtrl *n, uint8_t *ptr, uint32_t len,
>                           NvmeTxDirection dir, NvmeRequest *req);
> uint16_t nvme_bounce_mdata(NvmeCtrl *n, uint8_t *ptr, uint32_t len,
>diff --git a/include/block/nvme.h b/include/block/nvme.h
>index b0a4e4291611..4ac926fbc687 100644
>--- a/include/block/nvme.h
>+++ b/include/block/nvme.h
>@@ -847,6 +847,7 @@ enum NvmeStatusCodes {
>     NVME_FEAT_NOT_NS_SPEC       = 0x010f,
>     NVME_FW_REQ_SUSYSTEM_RESET  = 0x0110,
>     NVME_NS_ALREADY_ATTACHED    = 0x0118,
>+    NVME_NS_PRIVATE             = 0x0119,
>     NVME_NS_NOT_ATTACHED        = 0x011A,
>     NVME_NS_CTRL_LIST_INVALID   = 0x011C,
>     NVME_CONFLICTING_ATTRS      = 0x0180,
>diff --git a/hw/block/nvme-ns.c b/hw/block/nvme-ns.c
>index ca04ee1bacfb..aee43ba0b873 100644
>--- a/hw/block/nvme-ns.c
>+++ b/hw/block/nvme-ns.c
>@@ -73,7 +73,7 @@ static int nvme_ns_init(NvmeNamespace *ns, Error **errp)
>     /* support DULBE and I/O optimization fields */
>     id_ns->nsfeat |= (0x4 | 0x10);
>
>-    if (nvme_ns_shared(ns)) {
>+    if (ns->params.shared) {
>         id_ns->nmic |= NVME_NMIC_NS_SHARED;
>     }
>
>@@ -387,7 +387,8 @@ static void nvme_zoned_ns_shutdown(NvmeNamespace *ns)
>     assert(ns->nr_open_zones == 0);
> }
>
>-static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
>+static int nvme_ns_check_constraints(NvmeCtrl *n, NvmeNamespace *ns,
>+                                     Error **errp)
> {
>     if (!ns->blkconf.blk) {
>         error_setg(errp, "block backend not configured");
>@@ -400,12 +401,32 @@ static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
>         return -1;
>     }
>
>+    if (ns->params.nsid > NVME_MAX_NAMESPACES) {
>+        error_setg(errp, "invalid namespace id (must be between 0 and %d)",
>+                   NVME_MAX_NAMESPACES);
>+        return -1;
>+    }
>+
>+    if (!n->subsys) {
>+        if (ns->params.detached) {
>+            error_setg(errp, "detached requires that the nvme device is "
>+                       "linked to an nvme-subsys device");
>+            return -1;
>+        }
>+
>+        if (ns->params.shared) {
>+            error_setg(errp, "shared requires that the nvme device is "
>+                       "linked to an nvme-subsys device");
>+            return -1;
>+        }
>+    }
>+
>     return 0;
> }
>
>-int nvme_ns_setup(NvmeNamespace *ns, Error **errp)
>+int nvme_ns_setup(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
> {
>-    if (nvme_ns_check_constraints(ns, errp)) {
>+    if (nvme_ns_check_constraints(n, ns, errp)) {
>         return -1;
>     }
>
>@@ -453,27 +474,60 @@ static void nvme_ns_realize(DeviceState *dev, Error **errp)
>     NvmeNamespace *ns = NVME_NS(dev);
>     BusState *s = qdev_get_parent_bus(dev);
>     NvmeCtrl *n = NVME(s->parent);
>+    NvmeSubsystem *subsys = n->subsys;
>+    uint32_t nsid = ns->params.nsid;
>+    int i;
>
>-    if (nvme_ns_setup(ns, errp)) {
>+    if (nvme_ns_setup(n, ns, errp)) {
>         return;
>     }
>
>-    if (ns->subsys) {
>-        if (nvme_subsys_register_ns(ns, errp)) {
>+    if (!nsid) {
>+        for (i = 1; i <= NVME_MAX_NAMESPACES; i++) {
>+            if (!nvme_ns(n, i) || nvme_subsys_ns(subsys, i)) {
>+                nsid = ns->params.nsid = i;
>+                break;
>+            }
>+        }
>+
>+        if (!nsid) {
>+            error_setg(errp, "no free namespace id");
>             return;
>         }
>     } else {
>-        if (nvme_register_namespace(n, ns, errp)) {
>+        if (nvme_ns(n, nsid) || nvme_subsys_ns(subsys, nsid)) {
>+            error_setg(errp, "namespace id '%d' already allocated", nsid);
>             return;
>         }
>     }
>+
>+    if (subsys) {
>+        subsys->namespaces[nsid] = ns;
>+
>+        if (ns->params.detached) {
>+            return;
>+        }
>+
>+        if (ns->params.shared) {
>+            for (i = 0; i < ARRAY_SIZE(subsys->ctrls); i++) {
>+                NvmeCtrl *ctrl = subsys->ctrls[i];
>+
>+                if (ctrl) {
>+                    nvme_attach_ns(ctrl, ns);
>+                }
>+            }
>+
>+            return;
>+        }
>+    }
>+
>+    nvme_attach_ns(n, ns);
> }
>
> static Property nvme_ns_props[] = {
>     DEFINE_BLOCK_PROPERTIES(NvmeNamespace, blkconf),
>-    DEFINE_PROP_LINK("subsys", NvmeNamespace, subsys, TYPE_NVME_SUBSYS,
>-                     NvmeSubsystem *),
>     DEFINE_PROP_BOOL("detached", NvmeNamespace, params.detached, false),
>+    DEFINE_PROP_BOOL("shared", NvmeNamespace, params.shared, false)i,

Nice change point, hope we need update the usage, removing "subsys" from 
nvme-ns device params and adding "shared" param?

>     DEFINE_PROP_UINT32("nsid", NvmeNamespace, params.nsid, 0),
>     DEFINE_PROP_UUID("uuid", NvmeNamespace, params.uuid),
>     DEFINE_PROP_UINT16("ms", NvmeNamespace, params.ms, 0),
>diff --git a/hw/block/nvme-subsys.c b/hw/block/nvme-subsys.c
>index 9fadef8cec99..283a97b79d57 100644
>--- a/hw/block/nvme-subsys.c
>+++ b/hw/block/nvme-subsys.c
>@@ -43,34 +43,6 @@ int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp)
>     return cntlid;
> }
>
>-int nvme_subsys_register_ns(NvmeNamespace *ns, Error **errp)
>-{
>-    NvmeSubsystem *subsys = ns->subsys;
>-    NvmeCtrl *n;
>-    uint32_t nsid = nvme_nsid(ns);
>-    int i;
>-
>-    assert(nsid && nsid <= NVME_SUBSYS_MAX_NAMESPACES);
>-
>-    if (subsys->namespaces[nsid]) {
>-        error_setg(errp, "namespace %d already registerd to subsy %s",
>-                   nvme_nsid(ns), subsys->parent_obj.id);
>-        return -1;
>-    }
>-
>-    subsys->namespaces[nsid] = ns;
>-
>-    for (i = 0; i < ARRAY_SIZE(subsys->ctrls); i++) {
>-        n = subsys->ctrls[i];
>-
>-        if (n && nvme_register_namespace(n, ns, errp)) {
>-            return -1;
>-        }
>-    }
>-
>-    return 0;
>-}
>-
> static void nvme_subsys_setup(NvmeSubsystem *subsys)
> {
>     const char *nqn = subsys->params.nqn ?
>diff --git a/hw/block/nvme.c b/hw/block/nvme.c
>index e84e43b2692d..734a80dbd540 100644
>--- a/hw/block/nvme.c
>+++ b/hw/block/nvme.c
>@@ -4250,7 +4250,7 @@ static uint16_t nvme_identify_ns_attached_list(NvmeCtrl *n, NvmeRequest *req)
>             continue;
>         }
>
>-        if (!nvme_ns_is_attached(ctrl, ns)) {
>+        if (!nvme_ns(ctrl, c->nsid)) {
>             continue;
>         }
>
>@@ -4907,6 +4907,10 @@ static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req)
>
>     trace_pci_nvme_ns_attachment(nvme_cid(req), dw10 & 0xf);
>
>+    if (!nvme_nsid_valid(n, nsid)) {
>+        return NVME_INVALID_NSID | NVME_DNR;
>+    }
>+
>     ns = nvme_subsys_ns(n->subsys, nsid);
>     if (!ns) {
>         return NVME_INVALID_FIELD | NVME_DNR;
>@@ -4928,18 +4932,23 @@ static uint16_t nvme_ns_attachment(NvmeCtrl *n, NvmeRequest *req)
>         }
>
>         if (attach) {
>-            if (nvme_ns_is_attached(ctrl, ns)) {
>+            if (nvme_ns(ctrl, nsid)) {
>                 return NVME_NS_ALREADY_ATTACHED | NVME_DNR;
>             }
>
>-            nvme_ns_attach(ctrl, ns);
>+            if (ns->attached && !ns->params.shared) {
>+                return NVME_NS_PRIVATE | NVME_DNR;
>+            }
>+
>+            nvme_attach_ns(ctrl, ns);
>             __nvme_select_ns_iocs(ctrl, ns);
>         } else {
>-            if (!nvme_ns_is_attached(ctrl, ns)) {
>+            if (!nvme_ns(ctrl, nsid)) {
>                 return NVME_NS_NOT_ATTACHED | NVME_DNR;
>             }
>
>-            nvme_ns_detach(ctrl, ns);
>+            ctrl->namespaces[nsid] = NULL;
>+            ns->attached--;
>
>             __nvme_update_dmrsl(ctrl);
>         }
>@@ -5827,6 +5836,12 @@ static void nvme_check_constraints(NvmeCtrl *n, Error **errp)
>     if (n->namespace.blkconf.blk) {
>         warn_report("drive property is deprecated; "
>                     "please use an nvme-ns device instead");
>+
>+        if (n->subsys) {
>+            error_setg(errp, "subsystem support is unavailable with legacy "
>+                       "namespace ('drive' property)");
>+            return;
>+        }
>     }
>
>     if (params->max_ioqpairs < 1 ||
>@@ -5889,75 +5904,6 @@ static void nvme_init_state(NvmeCtrl *n)
>     n->aer_reqs = g_new0(NvmeRequest *, n->params.aerl + 1);
> }
>
>-static int nvme_attach_namespace(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
>-{
>-    if (nvme_ns_is_attached(n, ns)) {
>-        error_setg(errp,
>-                   "namespace %d is already attached to controller %d",
>-                   nvme_nsid(ns), n->cntlid);
>-        return -1;
>-    }
>-
>-    nvme_ns_attach(n, ns);
>-
>-    return 0;
>-}
>-
>-int nvme_register_namespace(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
>-{
>-    uint32_t nsid = nvme_nsid(ns);
>-
>-    if (nsid > NVME_MAX_NAMESPACES) {
>-        error_setg(errp, "invalid namespace id (must be between 0 and %d)",
>-                   NVME_MAX_NAMESPACES);
>-        return -1;
>-    }
>-
>-    if (!nsid) {
>-        for (int i = 1; i <= n->num_namespaces; i++) {
>-            if (!nvme_ns(n, i)) {
>-                nsid = ns->params.nsid = i;
>-                break;
>-            }
>-        }
>-
>-        if (!nsid) {
>-            error_setg(errp, "no free namespace id");
>-            return -1;
>-        }
>-    } else {
>-        if (n->namespaces[nsid]) {
>-            error_setg(errp, "namespace id '%d' is already in use", nsid);
>-            return -1;
>-        }
>-    }
>-
>-    trace_pci_nvme_register_namespace(nsid);
>-
>-    /*
>-     * If subsys is not given, namespae is always attached to the controller
>-     * because there's no subsystem to manage namespace allocation.
>-     */
>-    if (!n->subsys) {
>-        if (ns->params.detached) {
>-            error_setg(errp,
>-                       "detached needs nvme-subsys specified nvme or nvme-ns");
>-            return -1;
>-        }
>-
>-        return nvme_attach_namespace(n, ns, errp);
>-    } else {
>-        if (!ns->params.detached) {
>-            return nvme_attach_namespace(n, ns, errp);
>-        }
>-    }
>-
>-    n->dmrsl = MIN_NON_ZERO(n->dmrsl,
>-                            BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
>-
>-    return 0;
>-}
>-
> static void nvme_init_cmb(NvmeCtrl *n, PCIDevice *pci_dev)
> {
>     uint64_t cmb_size = n->params.cmb_size_mb * MiB;
>@@ -6187,6 +6133,18 @@ static int nvme_init_subsys(NvmeCtrl *n, Error **errp)
>     return 0;
> }
>
>+void nvme_attach_ns(NvmeCtrl *n, NvmeNamespace *ns)
>+{
>+    uint32_t nsid = ns->params.nsid;
>+    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
>+
>+    n->namespaces[nsid] = ns;
>+    ns->attached++;
>+
>+    n->dmrsl = MIN_NON_ZERO(n->dmrsl,
>+                            BDRV_REQUEST_MAX_BYTES / nvme_l2b(ns, 1));
>+}
>+
> static void nvme_realize(PCIDevice *pci_dev, Error **errp)
> {
>     NvmeCtrl *n = NVME(pci_dev);
>@@ -6218,13 +6176,11 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
>         ns = &n->namespace;
>         ns->params.nsid = 1;
>
>-        if (nvme_ns_setup(ns, errp)) {
>+        if (nvme_ns_setup(n, ns, errp)) {
>             return;
>         }
>
>-        if (nvme_register_namespace(n, ns, errp)) {
>-            return;
>-        }
>+        nvme_attach_ns(n, ns);
>     }
> }
>
>diff --git a/hw/block/trace-events b/hw/block/trace-events
>index 22da06986d72..fa12e3a67a75 100644
>--- a/hw/block/trace-events
>+++ b/hw/block/trace-events
>@@ -51,7 +51,6 @@ hd_geometry_guess(void *blk, uint32_t cyls, uint32_t heads, uint32_t secs, int t
>
> # nvme.c
> # nvme traces for successful events
>-pci_nvme_register_namespace(uint32_t nsid) "nsid %"PRIu32""
> pci_nvme_irq_msix(uint32_t vector) "raising MSI-X IRQ vector %u"
> pci_nvme_irq_pin(void) "pulsing IRQ pin"
> pci_nvme_irq_masked(void) "IRQ is masked"
>-- 

Changes looks good to me.
Reviewed-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>

>2.31.0
>
>

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Re: [PATCH for-6.0 0/7] hw/block/nvme: misc fixes

[Gollu Appalanaidu]

[-- Attachment #1: Type: text/plain, Size: 1039 bytes --]

On Wed, Mar 24, 2021 at 09:09:00PM +0100, Klaus Jensen wrote:
>From: Klaus Jensen <k.jensen@samsung.com>
>
>Various fixes for 6.0.
>
>Klaus Jensen (7):
>  hw/block/nvme: fix pi constraint check
>  hw/block/nvme: fix missing string representation for ns attachment
>  hw/block/nvme: fix the nsid 'invalid' value
>  hw/block/nvme: fix controller namespaces array indexing
>  hw/block/nvme: fix warning about legacy namespace configuration
>  hw/block/nvme: update dmsrl limit on namespace detachment
>  hw/block/nvme: fix handling of private namespaces
>
> hw/block/nvme-ns.h     |  12 ++--
> hw/block/nvme-subsys.h |   7 +--
> hw/block/nvme.h        |  45 ++------------
> include/block/nvme.h   |   1 +
> hw/block/nvme-ns.c     |  76 ++++++++++++++++++++----
> hw/block/nvme-subsys.c |  28 ---------
> hw/block/nvme.c        | 131 ++++++++++++++++-------------------------
> hw/block/trace-events  |   1 -
> 8 files changed, 129 insertions(+), 172 deletions(-)
>
>--

Reviewed-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>

>2.31.0
>
>

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Re: [PATCH for-6.0 7/7] hw/block/nvme: fix handling of private namespaces

[Klaus Jensen]

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On Apr  5 18:02, Gollu Appalanaidu wrote:
> On Wed, Mar 24, 2021 at 09:09:07PM +0100, Klaus Jensen wrote:
> > From: Klaus Jensen <k.jensen@samsung.com>
> > 
> > Prior to this patch, if a private nvme-ns device (that is, a namespace
> > that is not linked to a subsystem) is wired up to an nvme-subsys linked
> > nvme controller device, the device fails to verify that the namespace id
> > is unique within the subsystem. NVM Express v1.4b, Section 6.1.6 ("NSID
> > and Namespace Usage") states that because the device supports Namespace
> > Management, "NSIDs *shall* be unique within the NVM subsystem".
> > 
> > Additionally, prior to this patch, private namespaces are not known to
> > the subsystem and the namespace is considered exclusive to the
> > controller with which it is initially wired up to. However, this is not
> > the definition of a private namespace; per Section 1.6.33 ("private
> > namespace"), a private namespace is just a namespace that does not
> > support multipath I/O or namespace sharing, which means "that it is only
> > able to be attached to one controller at a time".
> > 
> > Fix this by always allocating namespaces in the subsystem (if one is
> > linked to the controller), regardsless of the shared/private status of
> > the namespace. Whether or not the namespace is shareable is controlled
> > by a new `shared` nvme-ns parameter.
> > 
> > Finally, this fix allows the nvme-ns `subsys` parameter to be removed,
> > since the `shared` parameter now serves the purpose of attaching the
> > namespace to all controllers in the subsystem upon device realization.
> > It is invalid to have an nvme-ns namespace device with a linked
> > subsystem without the parent nvme controller device also being linked to
> > one and since the nvme-ns devices will unconditionally be "attached" (in
> > QEMU terms that is) to an nvme controller device through an NvmeBus, the
> > nvme-ns namespace device can always get a reference to the subsystem of
> > the controller it is explicitly (using 'bus=' parametr) or implicitly
> > attaching to.
> > 
> > Fixes: e570768566b3 ("hw/block/nvme: support for shared namespace in subsystem")
> > Cc: Minwoo Im <minwoo.im.dev@gmail.com>
> > Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> > ---
> > hw/block/nvme-ns.h     |  10 ++--
> > hw/block/nvme-subsys.h |   7 ++-
> > hw/block/nvme.h        |  39 +-------------
> > include/block/nvme.h   |   1 +
> > hw/block/nvme-ns.c     |  74 +++++++++++++++++++++++----
> > hw/block/nvme-subsys.c |  28 -----------
> > hw/block/nvme.c        | 112 +++++++++++++----------------------------
> > hw/block/trace-events  |   1 -
> > 8 files changed, 106 insertions(+), 166 deletions(-)
> > 

<snip>

> > 
> > static Property nvme_ns_props[] = {
> >     DEFINE_BLOCK_PROPERTIES(NvmeNamespace, blkconf),
> > -    DEFINE_PROP_LINK("subsys", NvmeNamespace, subsys, TYPE_NVME_SUBSYS,
> > -                     NvmeSubsystem *),
> >     DEFINE_PROP_BOOL("detached", NvmeNamespace, params.detached, false),
> > +    DEFINE_PROP_BOOL("shared", NvmeNamespace, params.shared, false)i,
> 
> Nice change point, hope we need update the usage, removing "subsys" from
> nvme-ns device params and adding "shared" param?
> 

Good catch, thanks. Fixing that up for a v2.

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