[Qemu-devel] [PATCH 3/3] ide: Adds wwn=hex qdev option allowing the user to specify a disk's World Wide Name

[Floris Bos]

Linux guests can address disks by their unique World Wide Name number (e.g. 
/dev/disk/by-id/wwn-0x5001517959123522)
This patch adds support for assigning a World Wide Name number to a virtual IDE 
disk.

Cc: kw...@redhat.com
Signed-off-by: Floris Bos <d...@noc-ps.com>
---
 hw/ide/core.c     |   13 +++++++++++--
 hw/ide/internal.h |    5 ++++-
 hw/ide/qdev.c     |    3 ++-
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/hw/ide/core.c b/hw/ide/core.c
index 3e50c52..b48e5c2 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -166,6 +166,13 @@ static void ide_identify(IDEState *s)
     if (dev && dev->conf.discard_granularity) {
         put_le16(p + 169, 1); /* TRIM support */
     }
+
+    if (s->wwn) {
+        put_le16(p + 108, s->wwn >> 48);
+        put_le16(p + 109, s->wwn >> 32);
+        put_le16(p + 110, s->wwn >> 16);
+        put_le16(p + 111, s->wwn);
+    }
 
     memcpy(s->identify_data, p, sizeof(s->identify_data));
     s->identify_set = 1;
@@ -1834,7 +1841,8 @@ static const BlockDevOps ide_cd_block_ops = {
 };
 
 int ide_init_drive(IDEState *s, BlockDriverState *bs, IDEDriveKind kind,
-                   const char *version, const char *serial, const char *model)
+                   const char *version, const char *serial, const char *model,
+                   uint64_t wwn)
 {
     int cylinders, heads, secs;
     uint64_t nb_sectors;
@@ -1860,6 +1868,7 @@ int ide_init_drive(IDEState *s, BlockDriverState *bs, 
IDEDriveKind kind,
     s->heads = heads;
     s->sectors = secs;
     s->nb_sectors = nb_sectors;
+    s->wwn = wwn;
     /* The SMART values should be preserved across power cycles
        but they aren't.  */
     s->smart_enabled = 1;
@@ -1994,7 +2003,7 @@ void ide_init2_with_non_qdev_drives(IDEBus *bus, 
DriveInfo *hd0,
             if (ide_init_drive(&bus->ifs[i], dinfo->bdrv,
                                dinfo->media_cd ? IDE_CD : IDE_HD, NULL,
                                *dinfo->serial ? dinfo->serial : NULL,
-                               NULL) < 0) {
+                               NULL, 0) < 0) {
                 error_report("Can't set up IDE drive %s", dinfo->id);
                 exit(1);
             }
diff --git a/hw/ide/internal.h b/hw/ide/internal.h
index b1319dc..100efd3 100644
--- a/hw/ide/internal.h
+++ b/hw/ide/internal.h
@@ -349,6 +349,7 @@ struct IDEState {
     int drive_serial;
     char drive_serial_str[21];
     char drive_model_str[41];
+    uint64_t wwn;
     /* ide regs */
     uint8_t feature;
     uint8_t error;
@@ -470,6 +471,7 @@ struct IDEDevice {
     char *version;
     char *serial;
     char *model;
+    uint64_t wwn;
 };
 
 #define BM_STATUS_DMAING 0x01
@@ -536,7 +538,8 @@ void ide_data_writel(void *opaque, uint32_t addr, uint32_t 
val);
 uint32_t ide_data_readl(void *opaque, uint32_t addr);
 
 int ide_init_drive(IDEState *s, BlockDriverState *bs, IDEDriveKind kind,
-                   const char *version, const char *serial, const char *model);
+                   const char *version, const char *serial, const char *model,
+                   uint64_t wwn);
 void ide_init2(IDEBus *bus, qemu_irq irq);
 void ide_init2_with_non_qdev_drives(IDEBus *bus, DriveInfo *hd0,
                                     DriveInfo *hd1, qemu_irq irq);
diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c
index 07227c7..a46578d 100644
--- a/hw/ide/qdev.c
+++ b/hw/ide/qdev.c
@@ -137,7 +137,7 @@ static int ide_dev_initfn(IDEDevice *dev, IDEDriveKind kind)
     }
 
     if (ide_init_drive(s, dev->conf.bs, kind,
-                       dev->version, serial, dev->model) < 0) {
+                       dev->version, serial, dev->model, dev->wwn) < 0) {
         return -1;
     }
 
@@ -174,6 +174,7 @@ static int ide_drive_initfn(IDEDevice *dev)
 #define DEFINE_IDE_DEV_PROPERTIES()                     \
     DEFINE_BLOCK_PROPERTIES(IDEDrive, dev.conf),        \
     DEFINE_PROP_STRING("ver",  IDEDrive, dev.version),  \
+    DEFINE_PROP_HEX64("wwn",  IDEDrive, dev.wwn, 0),    \
     DEFINE_PROP_STRING("serial",  IDEDrive, dev.serial),\
     DEFINE_PROP_STRING("model", IDEDrive, dev.model)
 
-- 
1.7.5.4