Re: [Xen-devel] [PATCH V5 02/15] Move x86 specific funtions/variables to arch header

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.09.14 at 13:09, <Ian.Campbell@xxxxxxxxxx> wrote:
> On Mon, 2014-09-22 at 11:56 +0100, Jan Beulich wrote:
>> >>> On 22.09.14 at 12:52, <Ian.Campbell@xxxxxxxxxx> wrote:
>> > On Fri, 2014-09-19 at 09:37 +0100, Jan Beulich wrote:
>> >> Hmm, so you're still moving the relocation processing code - why? I
>> >> don't recall you having said you're sure you'll not need this on ARM.
>> > 
>> > ARM relocates itself to the top of memory during bringup already. I
>> > don't think we need to do it here as well/instead.
>> 
>> There are two relocations (on x86) actually: One (always used) is
>> to move the hypervisor image to high physical memory. The other
>> (needed under UEFI only) is to relocate the hypervisor from where
>> the UEFI loader put it (running in physical mode, virtual and
>> physical addresses are the same) to its linked virtual address. Are
>> you saying that ARM isn't in need of this?
> 
> Correct, the main ARM entry point (which the UEFI stub calls) takes care
> of enabling paging, including handling the move from (potentially
> differing) physical to virtual addresses.

Ah, right - this really makes the need for doing the extra relocation
step x86-64-specific. So Roy, I withdraw my objection then to moving
these pieces into arch-specific code.

Jan


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