[Xen-devel] RE: [PATCH 0/6] Add memory add support to Xen

["Nakajima, Jun" <jun.nakajima@xxxxxxxxx>]

Jiang, Yunhong wrote on Sun, 28 Jun 2009 at 02:26:51:

> 
> There are several option to support it.
> a) Move the ACPI event to Xen HV, that is sure to be a big changes.
> b) Add some hook in Dom0, so that instead of add the new memory to dom0,
> it will use hypercall to notify Xen HV.
> c) Change current dom0 implementation. When dom0 get the ACPI event and
> get the memory device's resource, it will not directly add the memry to
> system, instead, it will notify user space with uevent. The uevent
> script will ask kernel to add the new memory to system. In Xen
> environment, the uevent script will notify Xen HV. We are still
> investigating on this option.
> 
> We are in early stage . any suggestion or new idea will be helpful to
> us and welcome.
> 

I think the option b is the practical choice because the kernel typically has a 
well-defined routine for that, and the maintenance cost of the diff for dom0 
should be very low. The option c may not work for other OS like Solaris...

Jun
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Intel Open Source Technology Center




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