[PATCH v2 03/14] hw/block/nvme: make lba data size configurable

[Klaus Jensen <its@irrelevant.dk>]

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

Allos the LBA data size (lbads) to be set between 9 and 12.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Acked-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 docs/specs/nvme.txt | 11 ++++++++++-
 hw/block/nvme-ns.h  |  1 +
 hw/block/nvme-ns.c  |  8 +++++++-
 hw/block/nvme.c     |  1 +
 4 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/docs/specs/nvme.txt b/docs/specs/nvme.txt
index 56d393884e7a..438ca50d698c 100644
--- a/docs/specs/nvme.txt
+++ b/docs/specs/nvme.txt
@@ -1,7 +1,16 @@
 NVM Express Controller
 ======================
 
-The nvme device (-device nvme) emulates an NVM Express Controller.
+The nvme device (-device nvme) emulates an NVM Express Controller. It is used
+together with nvme-ns devices (-device nvme-ns) which emulates an NVM Express
+Namespace.
+
+nvme-ns Options
+---------------
+
+  `lbads`; The "LBA Data Size (LBADS)" indicates the LBA data size used by the
+     namespace. It is specified in terms of a power of two. Only values between
+     9 and 12 (both inclusive) are supported.
 
 
 Reference Specifications
diff --git a/hw/block/nvme-ns.h b/hw/block/nvme-ns.h
index 83734f4606e1..78b0d1a00672 100644
--- a/hw/block/nvme-ns.h
+++ b/hw/block/nvme-ns.h
@@ -21,6 +21,7 @@
 
 typedef struct NvmeNamespaceParams {
     uint32_t nsid;
+    uint8_t  lbads;
 } NvmeNamespaceParams;
 
 typedef struct NvmeNamespace {
diff --git a/hw/block/nvme-ns.c b/hw/block/nvme-ns.c
index 2ba0263ddaca..576c7486f45b 100644
--- a/hw/block/nvme-ns.c
+++ b/hw/block/nvme-ns.c
@@ -36,7 +36,7 @@ static void nvme_ns_init(NvmeNamespace *ns)
         ns->id_ns.dlfeat = 0x9;
     }
 
-    id_ns->lbaf[0].ds = BDRV_SECTOR_BITS;
+    id_ns->lbaf[0].ds = ns->params.lbads;
 
     id_ns->nsze = cpu_to_le64(nvme_ns_nlbas(ns));
 
@@ -77,6 +77,11 @@ static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
         return -1;
     }
 
+    if (ns->params.lbads < 9 || ns->params.lbads > 12) {
+        error_setg(errp, "unsupported lbads (supported: 9-12)");
+        return -1;
+    }
+
     return 0;
 }
 
@@ -125,6 +130,7 @@ static void nvme_ns_realize(DeviceState *dev, Error **errp)
 static Property nvme_ns_props[] = {
     DEFINE_BLOCK_PROPERTIES(NvmeNamespace, blkconf),
     DEFINE_PROP_UINT32("nsid", NvmeNamespace, params.nsid, 0),
+    DEFINE_PROP_UINT8("lbads", NvmeNamespace, params.lbads, BDRV_SECTOR_BITS),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 3cbc3c7b75b1..758f58c88026 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -2812,6 +2812,7 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
     if (n->namespace.blkconf.blk) {
         ns = &n->namespace;
         ns->params.nsid = 1;
+        ns->params.lbads = BDRV_SECTOR_BITS;
 
         if (nvme_ns_setup(n, ns, errp)) {
             return;
-- 
2.28.0