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

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 28/06/2009 10:26, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:

> BTW, we also want to have some discussion on how to support memory hot add.
> The main challenges comes from ACPI.
> When memory hot add happen, it will trigger an ACPI event. The ACPI driver
> will get memory device's resource information, including start/end address,
> NUMA informatin (proximity domain information) etc and in the end add the
> memory to OSPM.
> In Xen, the ACPI event will be handled firstly by Dom0 , but dom0 have no idea
> of physical memory. The real memory adding should happen in Xen HV.
> 
> There are several option to support it.
> a) Move the ACPI event to Xen HV, that is sure to be a big changes.

There's been some discussion of making Xen the OSPM instead of dom0 (and
hence giving Xen an AML interpreter, etc). Could be an interesting thing to
think about. I'm not sure how well it would work since there will still be
aspects of platform management that dom0 is in control of and would
logically be the OSPM for.

 -- Keir



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