Re: [Qemu-devel] [PATCH 2/5] exec: qemu_ram_alloc_device, qemu_ram_resize

[Paolo Bonzini]

On 20/11/2014 09:12, Gerd Hoffmann wrote:
>   Hi,
> 
>> I don't know why RHEL7 SeaBIOS does not work on RHEL6.  But note that
>> it's a really old version (0.12).
> 
> Hmm, works for me on a quick smoke test.  Do you remember what exactly
> broke and which version it was?  Maybe the 1.7.2 -> 1.7.5 update fixed
> it?

Possibly.  I tested 1.7.2 about a month ago and it failed.

> Or was it live-migration by chance?  rhel6 qemu doesn't emulate pam
> registers correctly, and seabios has a workaround for that.  So
> live-migrating between versions with and without correct pam emulation
> creates some *ahem* very interesting corner cases ...

No, it was not live migration.  Laszlo found it when he was trying to
identify a live migration bug as a QEMU bug or SeaBIOS bug; but he
didn't even get to the point of doing live migration. :)

Paolo