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Re: [Xen-devel] Design doc of adding ACPI support for arm64 on Xen - version 2

>>> On 13.08.15 at 13:00, <julien.grall@xxxxxxxxxx> wrote:
> On 13/08/15 11:54, Jan Beulich wrote:
>>>>> On 13.08.15 at 12:48, <zhaoshenglong@xxxxxxxxxx> wrote:
>>> On 2015/8/13 18:29, Christoffer Dall wrote:
>>>> However, what about for other resources?  Having code somewhere that
>>>> says "hide this random piece of hardware if you're Xen dom0" sounds
>>>> awful to me.  I know it's only the serial port right now, but still.
>>> It needs to modify MADT table according to dom0_max_vcpus and modify EFI
>>> MMAP table according to dom0_mem. And modify FADT table to set
>>> hypervisor_id as "XenVMM" to tell Dom0 that it runs on Xen hypervisor.
>> None of this should be required:
>> Unaltered MADT may (or should I say will) be needed to drive P- or
>> C-states.
> We have to alter MADT for different reasons:
>       - restricting the number of vCPUs
>       - update the CPU bring up method
>       - changing the CPUID
> Maybe we should pass a backup but we don't support cpufreq driver right
> now and it would need quite a look of work to do it (see [1]).

I.e. you intend to not even leave open the road there.


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