Re: [Xen-devel] HVMlite ABI specification DRAFT B + implementation outline

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.02.16 at 15:36, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 02/09/2016 06:58 AM, Roger Pau Monnà wrote:
>> El 9/2/16 a les 11:56, Andrew Cooper ha escrit:
>>> On 08/02/16 19:03, Roger Pau Monnà wrote:
>>>>
>>>> Description of physical hardware devices will always come from ACPI, in the
>>>> absence of any physical hardware device no ACPI tables will be provided. 
>>>> The
>>>> presence of ACPI tables can be detected by finding the RSDP, just like on
>>>> bare metal.
>>> As we are extending the base structure, why not have an RSDP paddr in it
>>> as well?  This avoids the need to scan RAM, and also serves as an
>>> indication of "No ACPI".
>> Right, this seems fine to me. I can send a patch later to expand the
>> structure unless anyone else complains.
>>
> 
> Isn't scanning memory the standard procedure for finding RSDP? Even if 
> we provide the address, guests will still search the memory (or is it 
> just Linux that does that?)

Not with e.g. EFI, so there's a precedent of avoiding that (legacy)
scan.

Jan

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