[Qemu-devel] hostdev / iSCSI issue in QEMU 2.7

[Holger Schranz]

Hello,

we need help for an issue we have sice QEMU 2.7.
May be we use the wrong mailing list. If so please let me know which
mail list we have to use to report problems in QEMU.

Best regards

Holger

===================================================================================

We use the following libvirt-descrption for a tape-device and a
changer-device:

    <hostdev mode='subsystem' type='scsi' managed='no' rawio='yes'>
      <source protocol='iscsi'
name='iqn.2008-09.net.fsc:server.LT260_61005/1'>
      <host name='192.168.200.53' port='3260'/>
      </source>
      <address type='drive' controller='2' bus='0' target='2' unit='2'/>
    </hostdev>

<!-- Media changer -->
    <hostdev mode='subsystem' type='scsi' managed='no' rawio='yes'>
      <source protocol='iscsi'
name='iqn.2008-09.net.fsc:server.LT260_61005/3'>
      <host name='192.168.200.53' port='3260'/>
      </source>
      <address type='drive' controller='2' bus='0' target='2' unit='6'/>
    </hostdev>

We use tgt as iSCSI-Server.

With qemu 2.6 it works fine.

With qemu 2.7RC4 we got the following error:

Thread 1 "qemu-system-x86" received signal SIGFPE, Arithmetic exception.
0x0000555555c207e2 in iscsi_refresh_limits (bs=0x5555568236f0,
    errp=0x7fffffffcca8) at
/home/kvm/SOURCES/qemu-2.7.0-rc4/block/iscsi.c:1838
1838        if (iscsilun->bl.max_ws_len < 0xffffffff /
iscsilun->block_size) {

The function iscsi_refresh_limits is changed in 2.7RC4 and devides by
iscsilun->block_size,
but the block size is filled only for SCSI-type TYPE_DISK and TYPE_ROM in
/home/kvm/SOURCES/qemu-2.7.0-rc4/block/iscsi.c:1378 (function
iscsi_readcapacity_sync)

If the libvirt-construction (see above) is correct, there is no chance
in qemu 2.7
to use a tape-device or changer via iscsi.

!!! If we should change the definition, please let us know. !!!

Backtrace:
 Thread 1 "qemu-system-x86" received signal SIGFPE, Arithmetic exception.
0x0000555555c207e2 in iscsi_refresh_limits (bs=0x5555568236f0,
    errp=0x7fffffffcca8) at
/home/kvm/SOURCES/qemu-2.7.0-rc4/block/iscsi.c:1838
1838        if (iscsilun->bl.max_ws_len < 0xffffffff /
iscsilun->block_size) {
(gdb) bt
#0  0x0000555555c207e2 in iscsi_refresh_limits (bs=0x5555568236f0,
errp=0x7fffffffcca8) at /home/kvm/SOURCES/qemu-2.7.0-rc4/block/iscsi.c:1838
#1  0x0000555555c018d4 in bdrv_refresh_limits (bs=0x5555568236f0,
errp=0x7fffffffcca8) at /home/kvm/SOURCES/qemu-2.7.0-rc4/block/io.c:121
#2  0x0000555555b9627a in bdrv_open_common (bs=0x5555568236f0, file=0x0,
options=0x555556827950, errp=0x7fffffffcd58)
    at /home/kvm/SOURCES/qemu-2.7.0-rc4/block.c:1013
#3  0x0000555555b97e3b in bdrv_open_inherit (filename=0x5555567de840
"iscsi://192.168.200.53:3260/iqn.2008-09.net.fsc%3Aserver.LT260_61005/1",
reference=0x0, options=0x555556827950, flags=57346,
parent=0x55555681d450, child_role=
    0x555556165360 <child_file>, errp=0x7fffffffcea8)
    at /home/kvm/SOURCES/qemu-2.7.0-rc4/block.c:1687
#4  0x0000555555b97524 in bdrv_open_child (filename=0x5555567de840
"iscsi://192.168.200.53:3260/iqn.2008-09.net.fsc%3Aserver.LT260_61005/1",
options=0x5555568216b0, bdref_key=0x555555d78112 "file",
parent=0x55555681d450, child_role=
    0x555556165360 <child_file>, allow_none=true, errp=0x7fffffffcea8)
    at /home/kvm/SOURCES/qemu-2.7.0-rc4/block.c:1449
#5  0x0000555555b97cb9 in bdrv_open_inherit (filename=0x5555567de840
"iscsi://192.168.200.53:3260/iqn.2008-09.net.fsc%3Aserver.LT260_61005/1",
reference=0x0, options=0x5555568216b0, flags=8194, parent=0x0, child_role=
    0x0, errp=0x7fffffffd1d8) at
/home/kvm/SOURCES/qemu-2.7.0-rc4/block.c:1648
#6  0x0000555555b9825c in bdrv_open (filename=0x5555567de840
"iscsi://192.168.200.53:3260/iqn.2008-09.net.fsc%3Aserver.LT260_61005/1",
reference=0x0, options=0x5555567ed240, flags=2, errp=0x7fffffffd1d8)
    at /home/kvm/SOURCES/qemu-2.7.0-rc4/block.c:1778
#7  0x0000555555beef4f in blk_new_open (filename=0x5555567de840
"iscsi://192.168.200.53:3260/iqn.2008-09.net.fsc%3Aserver.LT260_61005/1",
reference=0x0, options=0x5555567ed240, flags=2, errp=0x7fffffffd1d8)
    at /home/kvm/SOURCES/qemu-2.7.0-rc4/block/block-backend.c:160
#8  0x00005555558ce2bb in blockdev_init (file=0x5555567de840
"iscsi://192.168.200.53:3260/iqn.2008-09.net.fsc%3Aserver.LT260_61005/1",
bs_opts=0x5555567ed240, errp=0x7fffffffd1d8) at
/home/kvm/SOURCES/qemu-2.7.0-rc4/blockdev.c:597
#9  0x00005555558cf576 in drive_new (all_opts=0x555556766fd0,
block_default_type=IF_IDE) at
/home/kvm/SOURCES/qemu-2.7.0-rc4/blockdev.c:1132
#10 0x00005555558eaec9 in drive_init_func (opaque=0x5555567787b0,
opts=0x555556766fd0, errp=0x0) at /home/kvm/SOURCES/qemu-2.7.0-rc4/vl.c:1138
#11 0x0000555555c9ab9d in qemu_opts_foreach (list=0x555556184fe0
<qemu_drive_opts>, func=0x5555558eae8a <drive_init_func>,
opaque=0x5555567787b0, errp=0x0)
    at /home/kvm/SOURCES/qemu-2.7.0-rc4/util/qemu-option.c:1116
#12 0x00005555558f434a in main (argc=85, argv=0x7fffffffd6e8,
envp=0x7fffffffd998) at /home/kvm/SOURCES/qemu-2.7.0-rc4/vl.c:4401

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