[SLOF] [PATCH] Fix ugly boot menu if devices have been specified with bootindex

Thomas Huth thuth at redhat.com
Wed Apr 5 21:21:07 AEST 2017

On 05.04.2017 10:55, Nikunj A Dadhania wrote:
> Thomas Huth <thuth at redhat.com> writes:
>> On 05.04.2017 10:26, Nikunj A Dadhania wrote:
>>> Nikunj A Dadhania <nikunj at linux.vnet.ibm.com> writes:
>>>> Thomas Huth <thuth at redhat.com> writes:
>>>>> If the user has started with some devices that have the bootindex
>>>>> parameter set, these devices show up in a very ugly way in the boot
>>>>> menu of SLOF. For example, if you start QEMU with:
>>>>>  qemu-system-ppc64 ... -boot menu=on -device spapr-vscsi,id=scsi0 \
>>>>>   -drive file=distro.iso,if=none,media=cdrom,readonly=on,id=img0 \
>>>>>   -device scsi-cd,drive=img0,bootindex=1
>>>> From distant memory, I understand that "-boot" and bootindex are
>>>> mutually exclusive. bootindex was introduced to qemu to get rid of
>>>> restrictive -boot option.
>>> For example, with "-boot order=cd" if we have 2disks, there is no way to specify
>>> which one to boot from. SLOF will boot from the first disk alias.
>>> If a selection is needed: menu=on is added, and we can then press F12 to
>>> get to menu and select the second disk.
>>> While for bootindex, I can use qemu command-line(bootindex=1) or libvirt
>>> xml tag "<boot order='1'/>" for the second disk. So with bootindex,
>>> there is no need for "-boot menu=on,order=cd"
>> Agreed, but it is still possible to enable the boot menu if you're also
>> using "bootindex" ...
> True, unfortunately :(
>> so please ignore my original patch, but I think
>> the boot menu code should also not take the devices in $bootdev into
>> account that have been specified with bootindex.
>> So likely the right solution is to simply skip all entries there that
>> are not aliases (i.e. skip the entries that start with a slash).
> Yes, that should be fine.

Actually, the boot menu is also broken in another case: If you store
something in the "boot-device" environment variable, it only shows that
value. For example with

 qemu-system-ppc64 ... -boot menu=on -cdrom some.iso  \
   -prom-env boot-device=disk

the boot menu only shows "disk", and ignores the CD-ROM. Fortunately,
hardly anybody uses these environment variables with QEMU nowadays. But
still, the behavior of the boot menu looks pretty wrong here to me.


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