Re: [Xen-devel] [PATCH v4 14/14] xen/x86: setup PVHv2 Dom0 ACPI tables

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 12/23/2016 11:02 AM, Konrad Rzeszutek Wilk wrote:
> On Fri, Dec 23, 2016 at 10:35:10AM -0500, Boris Ostrovsky wrote:
>> On 12/23/2016 10:31 AM, Konrad Rzeszutek Wilk wrote:
>>>> But this still assumes that dom0 handles ACPI event for a pCPUs as well,
>>>> right? And I am not sure this can work.
>>>>
>>>> Actually, how do we hotplug pCPUs now?
>>> xen-hptool
>> Yes, but this has nothing to do with an actual pCPU being hot-plugged
>> into the system. It's similar to doing 'echo 1 > /sys/.../cpuX/online in
>> Lnux.
>>
>> My question is --- how do we (hypervisor/dom0/toolstack) become aware of
>> appearance of a new processor.
> Ooooh. drivers/xen/xen-acpi-cpuhotplug.c

Looking at this code I think we should be able to at least differentiate
between pCPU and vCPU and not add pCPU to dom0.

-boris

>
>
> But
> 213 config XEN_STUB                                                           
>       
> 214     bool "Xen stub drivers"                                               
>       
> 215     depends on XEN && X86_64 && BROKEN                                    
>       
> 216     default n                                          
>
>
> 235 config XEN_ACPI_HOTPLUG_CPU                                               
>       
> 236     tristate "Xen ACPI cpu hotplug"                                       
>       
> 237     depends on XEN_DOM0 && XEN_STUB && ACPI       
>
> So it is probably very very badly not working.
>
>> -boris



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