| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
RE: [Xen-devel] HVM vcpu hotplug (was: shutdown/reboot/sysrq/vcpu-set fr
Stefano Stabellini wrote:
> On Wed, 1 Sep 2010, Stefano Stabellini wrote:
>>>
>>> For the cpu-set I've modified the file
>>> linux-2.6.36-rc3/drivers/xen/cpu_hotplug.c and the check fo
>>> pv_domain in setup_vcpu_hotlug_event(void). And then I can remove
>>> CPUs but not add some :
>>>
>>> xl vcpu-set DOMID 2 -> "CPU 2 is now offline / CPU 3 is now
>>> offline"
>>>
>>> I've tried the same modification on ballooning driver and hvc
>>> console one but it gave me a kernel panic ...
>>>
>>
>> In my tree both the ballooning driver and the hvc console should
>> work correctly on hvm. Regarding the pv cpu hotplug mechanism, I
>> don't think is a good idea to enable it on hvm: there must be an
>> alternative fully virtualized way to hotplug a cpu into a non-pv
>> guest, like Windows, and that should work for pv on hvm guests too.
>
> I have done some testing on cpu hotplug for hvm guests and it turns
> out that it is currently broken on xen-unstable.
Some strange.
Stabellini, would you please tell me more clear?
How did you do the test? what command? and error log?
Thanks,
Jinsong
> I have just sent two patches to fix it.
> Once they got applied you should be able to specify the maximum number
> of vcpus using the "maxvcpus" parameter in your config file; then use
> vcpu-set to dynamically change the number of vcpus in the guest.
> Linux needs to be compiled with CONFIG_ACPI_HOTPLUG_CPU=y in order for
> this to work.
> Once you hotplug a new cpu in the guest you also need to enable it
> manually, with the following command:
>
> echo -n 1 > /sys/devices/system/cpu/cpu$CPUNUMBER/online
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home