Re: [Qemu-devel] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM

[Michael Tokarev]

15.02.2013 07:43, Kevin O'Connor wrote:
> On Fri, Feb 15, 2013 at 04:10:59AM +0100, Laszlo Ersek wrote:
>> On 02/15/13 02:22, Kevin O'Connor wrote:
>>> On Thu, Feb 14, 2013 at 08:16:02PM -0500, Kevin O'Connor wrote:
>>> By chance, are you using an older version of kvm?  There was a bug in
>>> kvm that caused changes to memory mapped at 0xe0000-0xfffff to also be
>>> reflected in the "rom" image at 0xfffe0000-0xffffffff.  It was my
>>> understand that this bug was fixed though.
>>
>> You are great! Disabling KVM for the guest (/domain/@type='qemu') made
>> the reboot work on both the RHEL-6 devel version of qemu and on upstream
>> 1.3.1.
>>
>> (I didn't try suspend/resume yet.)
>>
>> Do you recall the precise commit that fixed the "reflection"? I've been
>> eyeballing kvm commit messages for a few ten minutes now, but of course
>> in vain. (CC'ing Gleb and Marcelo.)
> 
> I found this email thread:
> 
> http://kerneltrap.org/mailarchive/linux-kvm/2010/9/21/6267744
> 
> and: http://marc.info/?l=kvm-commits&m=128576215909532

This patch is more than 2 years old and is applied to all more or
less recent qemu versions.  This does not tell us why disabling
kvm (with this patch applied!) makes a difference.  So there must
be another (maybe similar) bug somewhere...

/mjt