Re: [PATCHv1] xen/balloon: disable memory hotplug in PV guests

[Juergen Gross <jgross@suse.com>]

On 03/19/2015 02:38 PM, Juergen Gross wrote:
> On 03/19/2015 12:34 PM, Daniel Kiper wrote:
>> On Thu, Mar 19, 2015 at 10:55:37AM +0100, Juergen Gross wrote:
>>> On 03/18/2015 04:14 PM, Daniel Kiper wrote:
>>
>> [...]
>>
>>>> I have checked new p2m code and I think that this is reasonable
>>>> solution too.
>>>
>>> Do I need any patches for xl to be able to test this? I did:
>>>
>>> xl mem-max 2 4096
>>> xl mem-set 2 4096
>>
>> Yep. I started work on it but I was not able to finish it.
>> Here you can find some old patches for this issue:
>>
>> http://lists.xen.org/archives/html/xen-devel/2013-04/msg03072.html
>>
>> Bob and I will work on it sooner or later (probably a bit later).
>>
>> Hmmm... Boris, David, how did you manage to get this memory hotplug
>> stuff working. Did you use xm instead of xl?
>
> Whoever can test this - what about the attached patch?

Already succeeded in testing. :-)

Rather easy via:

Dom0: xl mem-max <domain> <size>
DomU: echo <size_in_kb> 
 >/sys/devices/system/xen_memory/xen_memory0/target_kb

On my system udev is set up to add the memory automatically, so no
further action required for me.

> David, you said:
>
> This one can be trivially fixed by setting the new sections in the p2m
> to INVALID_P2M_ENTRY before calling add_memory().
>
> Are you preparing a patch for this, or do you want me to do it?

I've already got a patch working, I'll send it soon.


Juergen