Re: [Xen-devel] S3 sleep in dom0 breaks dom0<->domU wallclock synchronization

[Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>]

On 07/06/10 16:09, Joanna Rutkowska wrote:
> On 07/06/10 14:50, Keir Fraser wrote:
>> On 06/07/2010 11:27, "Joanna Rutkowska" <joanna@xxxxxxxxxxxxxxxxxxxxxx>
>> wrote:
>>
>>>> Wouldn't it be much simpler to not introduce any new logic at all and
>>>> just let Dom0 tools/scripts take care of properly suspending
>>>> (checkpointing) all (minimally all pv, but I would really think treating
>>>> different kinds of guests differently here is unnecessary) guests
>>>> before doing a host suspend, as Jeremy had suggested in an earlier
>>>> reply?
>>>>
>>>
>>> But wouldn't this require dumping all the VMs memory do disk? Can we use
>>> xm pause instead, i.e. will it notify VMs properly?
>>
>> It just requires the guests to be put through a guest-side suspend/resume
>> cycle. The usual tools-side work of saving to disk etc could be elided. Yes,
>> it probably makes sense to extend that existing mechanism to include S3 as
>> well. Just needs someone to do the work. :-)
>>
> 
> Perhaps it will also solve the resume problem on Core i5/HT systems...
> 

For now, I have added another pm-utils hook that does something like
this on every system resume:

DATE=$(date)
qvm-run --all -u root "date -s \"$DATE\""

The qvm-run command is Qubes-specific, but I can imagine one could add a
similar functionality to xm.

I've been using this for a few days now, and it seems to work very well.

joanna.

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