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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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


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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