Re: kvm causing memory corruption? now 2.6.26-rc4

[Dave Hansen <dave@linux.vnet.ibm.com>]

On Wed, 2008-06-04 at 16:42 +0300, Avi Kivity wrote:
> Dave Hansen wrote:
...
> > After collecting all those, I turned on CONFIG_DEBUG_HIGHMEM and the
> > oopses miraculously stopped.  But, the guest hung (for at least 5
> > minutes or so) during windows bootup, pegging my host CPU.  Most of the
> > CPU was going to klogd, so I checked dmesg.
> >
> Can you check with mem=900 (and CONFIG_HIGHMEM_DEBUG=n)?  That will 
> confirm that the problems are highmem related, but not physical address 
> truncation related.

Do you mean 800M? ;) Highmem begins at 896MB if I remember correctly.

Anyway, it still oopses on current git with mem=800M

> > I was seeing messages like this
> >
> > [  428.918108] kvm_handle_exit: unexpected, valid vectoring info and exit reason is 0x9
> >
> > And quite a few of them, like 100,000/sec.  That's why klogd was pegging
> > the CPU.  Any idea on a next debugging step?
> >
> That's a task switch.  Newer kvms handle them.

Newer userspace?  I'm running current kvm-git userspace as of a day or
two ago.

-- Dave