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Re: [PATCH v3 2/5] xen/x86: manually build xen.mb.efi binary

  • To: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Wed, 9 Jun 2021 15:45:59 +0200
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  • Cc: Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Wed, 09 Jun 2021 13:46:21 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 09.06.2021 15:18, Daniel Kiper wrote:
> On Wed, May 19, 2021 at 04:35:00PM +0200, Jan Beulich wrote:
>> On 19.05.2021 14:48, Daniel Kiper wrote:
>>> On Wed, May 19, 2021 at 11:29:43AM +0200, Jan Beulich wrote:
>>>> Also not sure what to do with Dwarf debug info, which just recently
>>>> we managed to avoid needing to strip unconditionally.
>>> I think debug info may stay as is. Just Multiboot2 header should not
>>> cover it if it is not needed.
>> You did say that .bss is expected to be last, which both .reloc and
>> debug info violate.
> The .bss section has to be last one in memory from Multiboot2 protocol
> point of view. However, nothing, AFAICT, forbids to have something
> behind in the file. Of course if you ignore the data at the end of file
> when you load the image using Multiboot2 protocol.

Well, debug info can be ignored. If MB2 would work like it does today,
then .reloc also would never be touched. Feels a little fragile, but
might be okay then.




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