[Qemu-devel] Problem to start VM with libiscsi + qemu upstream

[Qemu-devel] Problem to start VM with libiscsi + qemu upstream

[Roy Shterman]

Hi all,

I'm trying to get VM started with libiscsi (iSCSI initiator) device. Every
thing seems good from iSCSI point of view, but I'm stuck in VM boot,
"Booting from Hard Disk".
Any idea what can get wrong? how I can assure that the boot itself is from
the wanted disk.
Also will be helpful if someone can tell me how can I debug issues like
that.

below my xml part of disks:

<domain type='kvm'>
  <name>client</name>
  <uuid>d4e60885-22be-4270-94ca-1be8209686d2</uuid>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-2.7'>hvm</type>
    <bootmenu enable='yes'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <vmport state='off'/>
  </features>
  <cpu mode='host-model' check='partial'>
    <model fallback='allow'/>
  </cpu>
  <clock offset='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='no'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/4.7-rc2_client.qcow2'/>
      <target dev='vda' bus='virtio'/>
      <boot order='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
    </disk>
    <disk type='network' device='disk'>
      <driver name='qemu' type='raw'/>
      <source protocol='iscsi' name='iqn.2001-04.com.client-tgt-1/0'>
        <host name='192.168.64.75' port='3260'/>
      </source>
      <target dev='vdb' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
    </disk>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='usb' index='0' model='piix3-uhci'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x2'/>
    </controller>
    <controller type='scsi' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:bf:6c:56'/>
      <source bridge='br0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
    </interface>

Thanks,
Roy

Re: [Qemu-devel] Problem to start VM with libiscsi + qemu upstream

[Fam Zheng]

On Tue, 01/02 21:58, Roy Shterman wrote:
> Hi all,
> 
> I'm trying to get VM started with libiscsi (iSCSI initiator) device. Every
> thing seems good from iSCSI point of view, but I'm stuck in VM boot,
> "Booting from Hard Disk".
> Any idea what can get wrong? how I can assure that the boot itself is from
> the wanted disk.
> Also will be helpful if someone can tell me how can I debug issues like
> that.

Do you still hit the hang if you remove the iscsi lun and only have the system
disk?

> 
> below my xml part of disks:
> 
> <domain type='kvm'>
>   <name>client</name>
>   <uuid>d4e60885-22be-4270-94ca-1be8209686d2</uuid>
>   <memory unit='KiB'>1048576</memory>
>   <currentMemory unit='KiB'>1048576</currentMemory>
>   <vcpu placement='static'>1</vcpu>
>   <os>
>     <type arch='x86_64' machine='pc-i440fx-2.7'>hvm</type>
>     <bootmenu enable='yes'/>
>   </os>
>   <features>
>     <acpi/>
>     <apic/>
>     <vmport state='off'/>
>   </features>
>   <cpu mode='host-model' check='partial'>
>     <model fallback='allow'/>
>   </cpu>
>   <clock offset='utc'>
>     <timer name='rtc' tickpolicy='catchup'/>
>     <timer name='pit' tickpolicy='delay'/>
>     <timer name='hpet' present='no'/>
>   </clock>
>   <on_poweroff>destroy</on_poweroff>
>   <on_reboot>restart</on_reboot>
>   <on_crash>restart</on_crash>
>   <devices>
>     <emulator>/usr/bin/qemu-system-x86_64</emulator>
>     <disk type='file' device='disk'>
>       <driver name='qemu' type='qcow2'/>
>       <source file='/var/lib/libvirt/images/4.7-rc2_client.qcow2'/>
>       <target dev='vda' bus='virtio'/>
>       <boot order='1'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
> function='0x0'/>
>     </disk>
>     <disk type='network' device='disk'>
>       <driver name='qemu' type='raw'/>
>       <source protocol='iscsi' name='iqn.2001-04.com.client-tgt-1/0'>
>         <host name='192.168.64.75' port='3260'/>
>       </source>
>       <target dev='vdb' bus='virtio'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
> function='0x0'/>

My wild guess is this disk's PCI addr is lower than the system disk. Can you
swap "slot='0x06'" with the previous "slot='0x07'" and try again?

(Stuck may be from an unfunctional MBR in the iscsi lun?)

Fam

>     </disk>
>     <controller type='pci' index='0' model='pci-root'/>
>     <controller type='usb' index='0' model='piix3-uhci'>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
> function='0x2'/>
>     </controller>
>     <controller type='scsi' index='0'>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
> function='0x0'/>
>     </controller>
>     <interface type='bridge'>
>       <mac address='52:54:00:bf:6c:56'/>
>       <source bridge='br0'/>
>       <model type='virtio'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
>     </interface>
> 
> Thanks,
> Roy