libvirt users - May 2016 - libvirt on Raspberry Pi, block by parameter "-S"

Hi

I have used libvirt on Raspberry Pi Debian.
I can start the vm,  but it just starts and doesn't continue.
I find the qemu-system-arm command generated by virsh has a parameter
"-S", when I copy the command, remove the parameter,  run it in the
console, the vm can run normally.
But I don't know how to remove  the parameter in the xml file, or in virsh.

Regards

Thank you

Xu

Here's the qemu-system-arm command, generated by libvirt:

LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
QEMU_AUDIO_DRV=none /usr/local/bin/qemu-system-arm -name test -S -machine
vexpress-a15,accel=kvm,usb=off -cpu host -m 500 -realtime mlock=off -smp
1,sockets=1,cores=1,threads=1 -uuid cab134ea-eed8-42e7-88cb-403ee2801e22
-nographic -no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/test.monitor,server,nowait -mon
chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot
menu=off,strict=on -kernel /home/pi/src/vexpress-zImage -append
"root=/dev/vda rw console=ttyAMA0" -dtb
/home/pi/src/vexpress-v2p-ca15-tc1.dtb -usb -drive
file=/home/pi/src/test.qcow2,if=none,id=drive-virtio-disk0,format=qcow2 -device
virtio-blk-device,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-drive
file=/home/pi/src/opensuse.img,if=none,media=cdrom,id=drive-virtio-disk1,readonly=on,format=raw
-device virtio-blk-device,scsi=off,drive=drive-virtio-disk1,id=virtio-disk1 -net
nic,macaddr=00:16:3e:5d:aa:a8,vlan=0,model=lan9118,name=net0 -net
tap,fd=23,vlan=0,name=hostnet0 -serial file:/var/log/libvirt/qemu/console.log
-serial pty -msg timestamp=on

Here's my xml file:

<domain type='kvm'>
  <name>test</name>
  <uuid>cab134ea-eed8-42e7-88cb-403ee2801e22</uuid>
  <memory unit='KiB'>512000</memory>
  <currentMemory unit='KiB'>512000</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <cputune>
    <vcpupin vcpu='0' cpuset='3'/>
  </cputune>
  <os>
    <type arch='armv7l'
machine='vexpress-a15'>hvm</type>
    <kernel>/home/pi/src/vexpress-zImage</kernel>
    <cmdline>&quot;root=/dev/vda rw
console=ttyAMA0&quot;</cmdline>
    <dtb>/home/pi/src/vexpress-v2p-ca15-tc1.dtb</dtb>
    <boot dev='hd'/>
    <bootmenu enable='no'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <cpu mode='host-model'>
    <model fallback='allow'/>
  </cpu>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/local/bin/qemu-system-arm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/home/pi/src/test.qcow2'/>
      <target dev='hda' bus='virtio'/>
      <address type='virtio-mmio'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/home/pi/src/opensuse.img'/>
      <target dev='hdb' bus='virtio'/>
      <readonly/>
      <address type='virtio-mmio'/>
    </disk>
    <interface type='bridge'>
      <mac address='00:16:3e:5d:aa:a8'/>
      <source bridge='br0'/>
      <model type='lan9118'/>
    </interface>
    <serial type='file'>
      <source path='/var/log/libvirt/qemu/console.log'/>
      <target port='0'/>
    </serial>
    <serial type='pty'>
      <target port='1'/>
    </serial>
    <console type='file'>
      <source path='/var/log/libvirt/qemu/console.log'/>
      <target type='serial' port='0'/>
    </console>
  </devices>
</domain>

On Thu, May 19, 2016 at 10:05:57AM +0000, Xu Ding wrote:
> Hi
> 
> I have used libvirt on Raspberry Pi Debian.
> I can start the vm,  but it just starts and doesn't continue.
> I find the qemu-system-arm command generated by virsh has a parameter
> "-S", when I copy the command, remove the parameter,  run it in
the
> console, the vm can run normally.
> But I don't know how to remove  the parameter in the xml file, or in
virsh.
There is no need to remove that parameter. That tells QEMU to initially
start with the guest CPUs stopped. This gives libvirt a chance to do some
initialization of QEMU first. Libvirt will then explicitly tell QEMU to
start the CPUs.

IOW, the existance of -S on the command line libvirt uses is likely not
related to whatever problem you have with running the guest.


Regards,
Daniel
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