Re: [Xen-devel] [PATCH v1 00/20] Make ACPI builder available to components other than hvmloader

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.07.16 at 18:32, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 07/06/2016 12:04 PM, Roger Pau Monné wrote:
>> On Tue, Jul 05, 2016 at 03:04:59PM -0400, Boris Ostrovsky wrote:
>>> * Don't set HW_REDUCED_ACPI flags: this flag is only available starting 
>>> with ACPI v5
>> Hm, I still think HW_REDUCED_ACPI should be set for the time being, 
>> considering that we don't provide PM timer or RTC for example. Not setting 
>> this would be a violation of the ACPI specification, and would mean 
>> introducing Xen specific hacks yet again to guest OSes, in order to disable 
>> those devices.
>>
>> Is the fact that HW_REDUCED_ACPI was introduced in ACPI v5 a problem?
> 
> Yes, because we build v2 tables and they are somewhat different.

So couldn't we switch to building v5 tables (or even v6) for PVH
(and perhaps re-using the "acpi=" config setting to allow specifying a
version - with any value above 1 indicating the requested version)? I
certainly agree that setting a v5 flag in a v2 table is bad (best we can
hope for is that any consumer would ignore such a flag).

Jan

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