[Qemu-devel] [PATCH 10/46] ide: Adds wwn=hex qdev option

[Kevin Wolf <kwolf@redhat.com>]

From: Floris Bos <bos@je-eigen-domein.nl>

Allow the user to specify a disk's World Wide Name.

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: kwolf@redhat.com
Signed-off-by: Floris Bos <dev@noc-ps.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/ide/core.c     |   29 +++++++++++++++++++++++------
 hw/ide/internal.h |    5 ++++-
 hw/ide/qdev.c     |    3 ++-
 3 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/hw/ide/core.c b/hw/ide/core.c
index 5647694..6e25338 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -142,8 +142,12 @@ static void ide_identify(IDEState *s)
     put_le16(p + 82, (1 << 14) | (1 << 5) | 1);
     /* 13=flush_cache_ext,12=flush_cache,10=lba48 */
     put_le16(p + 83, (1 << 14) | (1 << 13) | (1 <<12) | (1 << 10));
-    /* 14=set to 1, 1=SMART self test, 0=SMART error logging */
-    put_le16(p + 84, (1 << 14) | 0);
+    /* 14=set to 1, 8=has WWN, 1=SMART self test, 0=SMART error logging */
+    if (s->wwn) {
+        put_le16(p + 84, (1 << 14) | (1 << 8) | 0);
+    } else {
+        put_le16(p + 84, (1 << 14) | 0);
+    }
     /* 14 = NOP supported, 5=WCACHE enabled, 0=SMART feature set enabled */
     if (bdrv_enable_write_cache(s->bs))
          put_le16(p + 85, (1 << 14) | (1 << 5) | 1);
@@ -151,8 +155,12 @@ static void ide_identify(IDEState *s)
          put_le16(p + 85, (1 << 14) | 1);
     /* 13=flush_cache_ext,12=flush_cache,10=lba48 */
     put_le16(p + 86, (1 << 13) | (1 <<12) | (1 << 10));
-    /* 14=set to 1, 1=smart self test, 0=smart error logging */
-    put_le16(p + 87, (1 << 14) | 0);
+    /* 14=set to 1, 8=has WWN, 1=SMART self test, 0=SMART error logging */
+    if (s->wwn) {
+        put_le16(p + 87, (1 << 14) | (1 << 8) | 0);
+    } else {
+        put_le16(p + 87, (1 << 14) | 0);
+    }
     put_le16(p + 88, 0x3f | (1 << 13)); /* udma5 set and supported */
     put_le16(p + 93, 1 | (1 << 14) | 0x2000);
     put_le16(p + 100, s->nb_sectors);
@@ -162,6 +170,13 @@ static void ide_identify(IDEState *s)
 
     if (dev && dev->conf.physical_block_size)
         put_le16(p + 106, 0x6000 | get_physical_block_exp(&dev->conf));
+    if (s->wwn) {
+        /* LE 16-bit words 111-108 contain 64-bit World Wide Name */
+        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);
+    }
     if (dev && dev->conf.discard_granularity) {
         put_le16(p + 169, 1); /* TRIM support */
     }
@@ -1833,7 +1848,8 @@ 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;
@@ -1859,6 +1875,7 @@ 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;
@@ -1993,7 +2010,7 @@ 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)
 
-- 
1.7.6.5