Re: Bug#707257: linux-image-3.8-1-686-pae: KVM crashes with "entry failed, hardware error 0x80000021"

[Gleb Natapov <gleb@redhat.com>]

On Sun, May 19, 2013 at 02:00:31AM +0100, Ben Hutchings wrote:
> Dear KVM maintainers, it appears that there is a gap in x86 emulation,
> at least on a 32-bit host.  Stefan found this when running GRML, a live
> distribution which can be downloaded from:
> <http://download.grml.org/grml32-full_2013.02.iso>.  His original
> reported is at <http://bugs.debian.org/707257>.
> 
Can you verify with latest linux.git HEAD? It works for me there on
64bit. There were a lot of problems fixed in this area in 3.9/3.10 time frame,
so it would be helpful if you'll test 32bit before I install one myself.

> On Thu, 2013-05-16 at 13:26 +0200, Stefan Pietsch wrote:
> > On 09.05.2013 20:56, Stefan Pietsch wrote:
> > > On 09.05.2013 03:08, Ben Hutchings wrote:
> > > 
> > >> Please could you test some of the intermediate versions at
> > >> <http://snapshot.debian.org/package/linux/> to find the first upstream
> > >> version where this was broken.
> > > 
> > > The first version which does not work is 3.6.4-1~experimental.1.
> > > 3.5.5-1~experimental.1 works.
> > 
> > 
> > I was able to start KVM under kernel version 3.8.12-1 after loading the
> > "kvm_intel" module with the option "emulate_invalid_guest_state=0".
> 
> And one of the many changes between 3.5 and 3.6 was to change the
> default value of that parameter from 0 to 1.  So we don't know when the
> the bug in emulation was introduced (or if it was always there).
> 
> Ben.
> 
> -- 
> Ben Hutchings
> The generation of random numbers is too important to be left to chance.
>                                                             - Robert Coveyou



--
			Gleb.