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

Dave Young
2010-10-18T14:25:23Z

On Mon, Oct 18, 2010 at 10:19 PM, Avi Kivity <avi@redhat.com> wrote:
>  On 10/18/2010 04:15 PM, Dave Young wrote:
>>
>> On Mon, Oct 18, 2010 at 10:13 PM, Avi Kivity<avi@redhat.com>  wrote:
>> >    On 10/18/2010 04:11 PM, Dave Young wrote:
>> >>
>> >>  On Mon, Oct 18, 2010 at 10:06 PM, Avi Kivity<avi@redhat.com>    wrote:
>> >>  >      On 10/18/2010 03:58 PM, Dave Young wrote:
>> >>  >>
>> >>  >>    >
>> >>  >>    >      Please patch hardware_setup() to show the value of
>> >>  >>    >      boot_cpu_has(X86_FEATURE_NX).
>> >>  >>
>> >>  >>    It's 0
>> >>
>> >>  Please wait, I reply too quick, actually it boots two times fine then
>> >>  one time fail.
>> >
>> >  What boots fine?  The guest?
>>
>> Yes the guest
>>
>
> That makes some sort of wierd sense.  First kvm samples X86_FEATURE_NX, sees
> that it has the feature, reports it to qemu, qemu runs the guest, NX gets
> disabled in between, the guest tries to enable NX, kvm kills it.
>
> Second time round, kvm reports that NX is not available, qemu does not
> enable it, neither does the guest, and everyone is happy.
>
> Please confirm that when the guest does boot, it boots without NX in
> /proc/cpuinfo.
>

Yes, there's no nx in guest cpuinfo

hardware_setup is run only when insmod so the nx is of host, thus the
first printk result is right value?
> --
> error compiling committee.c: too many arguments to function
>
>

--
Regards
dave