Re: qemu-kvm-0.12.2 hangs when booting grub, when kvm is disabled

[Jan Kiszka <jan.kiszka@siemens.com>]

Gleb Natapov wrote:
> On Thu, Feb 18, 2010 at 12:32:39PM +0100, Jan Kiszka wrote:
>> Jacques Landru wrote:
>>> Hi,
>>>
>>> Same problem here
>>>
>>> qemu-kvm-0.12.x hangs if I have at the same time "-no-kvm" and 
>>> "file=essai-slitaz.raw,if=ide,index=0,boot=on" sometime with the
>>> message  below
>>>
>>> but
>>>
>>> qemu-kvm with "-no-kvm" and without "boot=on" option for the file 
>>> parameter, works
>>> qemu-kvm with "boot=on" option and kvm enable works. (kvm-kmod is 2.6.32.7)
>> I have to confirm this issue: Something badly crashes here as well,
>> either grub or the extboot ROM or Seabios.
>>
>> Does anyone has a good idea what makes the difference here, ie. where to
>> start debugging?
>>
> May be TCG interprets something incorrectly in extboot.bin. Sounds
> unlikely, but symptoms look like this is the case.

Looks like the old story again: extboot tries to write to ROM (old_int13
and old_int19 variables). That happens to work due to KVM limitations,
but breaks once true protection is established. Don't we have some heap
managed by Seabios that extension ROMs can use?

Jan

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