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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 07/06/2016 12:04 PM, Roger Pau Monné wrote:
> Hello,
>
> Thanks for the refresh! Do you have this series in some git tree I can pull 
> from?

Sorry, forgot to include this in the message:

git://oss.oracle.com/git/bostrovs/xen.git:acpi_v1



>
> On Tue, Jul 05, 2016 at 03:04:59PM -0400, Boris Ostrovsky wrote:
>> This is V1 of the series posted earlier as an RFC
>>
>> The goal here is to build ACPI tables for PVHv2/HVMlite guests while reusing 
>> existing
>> hvmloader's ACPI builder code. The builder is provided as a library in 
>> tools/libacpi.
>>
>> Main changes from RFC are:
>> * Move toolstack code that loads the tables into PVHv2 guest from libxc to 
>> libxl
>> * Don't provide the builder to hypervisor as we didn't find a user for that 
>> (at least so far)
>> * Update e820 map for PVHv2 guests when ACPI tables are loaded
>> * 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.

-boris

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