Re: [Xen-devel] [PATCH 4/4] hvmloader: add support to load extra ACPI tables from qemu

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.01.16 at 10:29, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 21/01/16 09:10, Xiao Guangrong wrote:
>> I am not sure if i have understood your point. What your suggestion is
>> that
>> leave PMEM for hypervisor and all other parts (PBLK and _DSM handling) to
>> Dom0? If yes, we should:
>> a) handle hotplug in hypervisor (new PMEM add/remove) that causes
>> hyperivsor
>>    interpret ACPI SSDT/DSDT.
>> b) some _DSMs control PMEM so you should filter out these kind of
>> _DSMs and
>>    handle them in hypervisor.
>> c) hypervisor should mange PMEM resource pool and partition it to
>> multiple
>>    VMs.
> 
> It is not possible for Xen to handle ACPI such as this.
> 
> There can only be one OSPM on a system, and 9/10ths of the functionality
> needing it already lives in Dom0.
> 
> The only rational course of action is for Xen to treat both PBLK and
> PMEM as "devices" and leave them in Dom0's hands.

See my other reply: Why would this be different from "ordinary"
memory hotplug?

Jan


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