Re: [Xen-devel] [PATCH v2 18/30] xen/x86: setup PVHv2 Dom0 ACPI tables

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.10.16 at 13:13, <roger.pau@xxxxxxxxxx> wrote:
> On Wed, Oct 26, 2016 at 01:14:16PM -0400, Boris Ostrovsky wrote:
>> >>>> I've initially used a back-listing approach. We can always change this 
>> >>>> later 
>> >>>> on.
>> >>>>
>> >>>> So I've ended up crafting a new MADT, XSDT and RSDP. Note that I'm not 
>> >>>> crafting a new custom RSDT (and in fact I'm setting 
>> >>>> rsdt_physical_address = 
>> >>>> 0 in the RSDP together with revision = 2). This is all placed in RAM 
>> >>>> stolen 
>> >>>> from the guest memory map and marked as E820_ACPI, which means that the 
>> >>>> new 
>> >>>> RSDP no longer resides below 1MB, 
>> 
>> As I mentioned in the other thread I am not sure this would be in
>> compliance with the ACPI spec.
> 
> Right, the ACPI spec mandates that the RSDP must reside in the first 1 KB of 
> the EBDA, or in the ROM regions between 0xE0000 0xFFFFF, but that's only 
> when booted from a legacy BIOS, when booted from UEFI the RSDP can reside 
> anywhere in memory, and the pointer must be fetched from a UEFI specific 
> table. I would consider Xen to be similar to UEFI boot in that regard.

+1

Jan

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