Re: [BUG] kvm: guest can not startup due to triple fault

Dave Young
2010-10-18T13:50:55Z

On Mon, Oct 18, 2010 at 03:46:17PM +0200, Avi Kivity wrote:
> On 10/18/2010 03:45 PM, Dave Young wrote:
> >On Mon, Oct 18, 2010 at 03:26:30PM +0200, Avi Kivity wrote:
> >> On 10/18/2010 02:58 PM, Dave Young wrote:
> >> >>
> >> >> It's secondary_startup_64 enabling efer.sce and efer.nx.
> >> >>
> >> >> Dave, please post your /proc/cpuinfo. Is your host running with NX
> >> >> disabled?
> >> >
> >> >I see nx bit in /proc/cpuinfo, Actually I don't know how to disable it.
> >>
> >> Strange.
> >>
> >> Please patch arch/x86/kvm/x86.c to printk efer_reserved_bits (a
> >> global), efer (an argument) and old_efer (a local), and post the
> >> results.
> >
> >I add printk before kvm_mmu_reset_context(vcpu), correct? get following value:
> >
>
> Add it at the beginning please, otherwise we'll miss the important
> one due to an early return.

here it is:

[ 3679.616500] efer_reserved_bits = 0xfffffffffffffafe
[ 3679.616504] efer = 0xd01
[ 3679.616506] old_efer = 0x500