[Qemu-devel] Boot order problem

[Minoru Usui]

Hi, everyone

I'm in trouble about boot order of VM.
If anyone know cause of this problem, please let me know.

On following environment, I tried to boot from IDE CD-ROM device 
without inserting any bootable media, which is expected to fail,
but VM was booting up from virtio HDD which was not specified as bootable 
device.

  * host : RHEL6.1(x86_64)
    guest: RHEL6.1(x86_64)
  * VM has IDE CD-ROM and virtio HDD.
  * There is no bootable media in IDE CD-ROM.
  * RHEL6.1 is installed in virtio HDD
  * Only IDE CD-ROM was spcified as bootable device.
  * XML configuration of libvirt is below.
    I tested <boot dev> and <boot order> setting,
    but both are booting up from virtio HDD.
    -------------------------------------------------------
    [<boot dev> setting version]
      <os>
        <type arch='x86_64' machine='rhel6.1.0'>hvm</type>
        <boot dev='cdrom'/>
        <bootmenu enable='no'/>
      </os>

    [<boot order> setting version]
       <disk type='file' device='cdrom'>
         <driver name='qemu' type='raw'/>
         <target dev='hdc' bus='ide'/>
         <boot order='1'/>
         <readonly/>
         <address type='drive' controller='0' bus='1' unit='0'/>
       </disk>
    -------------------------------------------------------

I installed latest qemu-kvm to /usr/local/qemu, and replaced
/usr/libexec/qemu-kvm to /user/local/qemu/bin/qemu-system-x86_64,
but it was booting up from virtio HDD.

On RHEL6.0 host, I tested <boot dev> setting version, 
VM didn't boot up from virtio HDD.
it cannot boot up from CD-ROM. (expected behaviour)

I checked qemu-kvm option by ps command,
but I think correct -boot or bootindex of -device option is specified.

[<boot dev> setting version(RHEL6.1 host)]
qemu      9871     1 74 16:22 ?        00:00:25 /usr/libexec/qemu-kvm -S -M 
rhel6.1.0 -enable-kvm -m 2048
 -smp 8,sockets=8,cores=1,threads=1 -name RHEL6.1-GA -uuid 
49703959-f0b0-9864-5788-4bc07028bac4 -nodefconfig
 -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/RHEL6.1-GA.monitor,server,nowait
 
 -mon chardev=charmonitor,id=monitor,mode=readline -rtc base=utc -boot 
order=d,menu=off
 -drive 
file=/work/libvirt/images/RHEL6.1GA_x86_64_full_file.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=threads
 -device 
virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0
 -drive 
file=/tmp/not_bootable_image.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw
 -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0
 -device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:0b:68:82,bus=pci.0,addr=0x3 
-net tap,fd=21,vlan=0,name=hostnet0
 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 
-usb -device usb-tablet,id=input0
 -vnc 127.0.0.1:0 -vga cirrus -device intel-hda,id=sound0,bus=pci.0,addr=0x4
 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6

  -> "-boot order=d" is specified


[<boot order> setting version(RHEL6.1 host)]
qemu      4073     1 23 10:08 ?        00:00:37 /usr/libexec/qemu-kvm -S -M 
rhel6.1.0 -enable-kvm -m 2048
 -smp 8,sockets=8,cores=1,threads=1 -name RHEL6.1-GA -uuid 
49703959-f0b0-9864-5788-4bc07028bac4 -nodefconfig -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/RHEL6.1-GA.monitor,server,nowait
 -mon chardev=charmonitor,id=monitor,mode=readline -rtc base=utc -drive 
file=/work/libvirt/images/RHEL6.1GA_x86_64_full_file.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=threads
 -device 
virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0
 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw
 -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1
 -device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:0b:68:82,bus=pci.0,addr=0x3 
-net tap,fd=21,vlan=0,name=hostnet0
 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 
-usb -device usb-tablet,id=input0
 -vnc 127.0.0.1:0 -vga cirrus -device intel-hda,id=sound0,bus=pci.0,addr=0x4
 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6

  -> "bootindex=1" is specified for IDE CD-ROM device only.


Next, I suspected seabios, but it was same version of RHEL6.0 and RHEL6.1.

  # rpm -q seabios
  seabios-0.6.1.2-3.el6.x86_64

What causes this problem?
-- 
Minoru Usui <address@hidden>