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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.12.16 at 19:19, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 12/22/2016 11:44 AM, Roger Pau Monne wrote:
>> On Thu, Dec 22, 2016 at 09:24:02AM -0700, Jan Beulich wrote:
>>>>>> On 22.12.16 at 17:17, <boris.ostrovsky@xxxxxxxxxx> wrote:
>>>> On 12/22/2016 07:17 AM, Roger Pau Monne wrote:
>>>>> Maybe Boris has some ideas about how to do CPU hotplug for Dom0?
>>>> Why would Xen need to be able to parse the AML that is intended to be
>>>> executed by dom0? I'd think that all the hypervisor would need to do is
>>>> to load it into memory, not any different from how it's done for regular
>>>> guests.
>>> Well, if Dom0 executed the unmodified _MAT, it would get back
>>> data relating to the physical CPU. Roger is overriding MADT to
>>> present virtual CPU information to Dom0, and this would likewise
>>> need to happen for the _MAT return value.
> 
> By "unmodified _MAT" you mean system's _MAT?  Why can't we provide our
> own that will return _MAT object properly adjusted for dom0? We are
> going to provide our own (i.e. not system's) DSDT, aren't we?

For Dom0? No, I didn't think so. We can't reasonably edit the host's,
and we also can't craft our own (that works only for DomU).

Jan


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