Re: [Xen-devel] error in xen/arch/x86/mm.c:get_page during migration

[Andres Lagar-Cavilla <andreslc@xxxxxxxxxxxxxx>]

>>>> On 22.02.13 at 21:07, Olaf Hering <olaf@xxxxxxxxx> wrote:
>> On Fri, Feb 22, Jan Beulich wrote:
>> 
>>>>>> On 21.02.13 at 18:31, Olaf Hering <olaf@xxxxxxxxx> wrote:
>>>> It did not happen with xl.
>>> 
>>> But the same guest and Dom0 kernel, and the same hypervisor?
>> 
>> Yes, same sles11sp2 dom0, and 3.7.9 pvops guest.
>> 
>>>> Here is the output while doing xm migrate:
>>>> 
>>>> (XEN) HVM2 restore: VMCE_VCPU 0
>>>> (XEN) HVM2 restore: VMCE_VCPU 1
>>>> (XEN) HVM2 restore: TSC_ADJUST 0
>>>> (XEN) HVM2 restore: TSC_ADJUST 1
>>>> (XEN) mm.c:1983:d0 Error pfn 4112c5: rd=ffff83036ffef000, 
>> od=0000000000000000, caf=180000000000000, taf=7400000000000001
>>> 
>>> Didn't even notice yesterday that this is apparently after restore
>>> has already started. Which makes me curious whether the domain
>>> that is being referenced with rd= is the old or the new one (would
>>> require printing the domain ID; honestly I never understood what
>>> use printing of the domain pointer is).
>>> 
>>> I'm also confused by the domain pointer always being the same;
>>> I would expect it to at least toggle between two values, but
>>> probably even be different between every instance of the guest.
>>> But you're not having a stubdom configured for the guest either,
>>> according to the config you sent earlier...
>> 
>> The rd->domain_id is DOMID_COW in both cases.
> 
> Which suggests that memory sharing is in use. At least I'm unaware
> of other uses of that pseudo domain.

There are none.

There seems to be something else amiss though. Unless I am parsing this 
incorrectly, taf == PGT_writable | PGT_pae_xen_l2? And caf == PAT | PCD? Looks 
like a very unlikely combination

Andres
> 
> Jan


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