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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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.

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel