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Re: [PATCH 00/21] x86: Trenchboot Secure Launch DRTM (Xen)
- To: Sergii Dmytruk <sergii.dmytruk@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 24 Apr 2025 19:51:21 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Lukasz Hawrylko <lukasz@xxxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Mateusz Mówka <mateusz.mowka@xxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, trenchboot-devel@xxxxxxxxxxxxxxxx
- Delivery-date: Thu, 24 Apr 2025 18:51:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24/04/2025 7:47 pm, Sergii Dmytruk wrote:
>> Alignment that large is unexpected, and I suspect we want to fix it. Is
>> it pre-existing, or something introduced by your series?
>>
>> ~Andrew
> Pre-existing one. I can see `-N` is already passed to `ld`:
>
> -N, --omagic Do not page align data, do not make text readonly
>
> Specifying `--section-alignment 512 --file-alignment 512 --nmagic`
> didn't reduce the alignment. Statistics so far:
>
> Give 0x1000 offset:
> GNU ld (GNU Binutils for Debian) 2.31.1
> GNU ld version 2.38-27.fc37
>
> Give 0x440 offset:
> GNU ld (GNU Binutils for Debian) 2.40
> GNU ld (GNU Binutils for Debian) 2.41
>
> Maybe that's not something configurable and just needs a newer version.
Ah - that's something that was changed literally yesterday:
https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=d444763f8ca556d0a67a4b933be303d346baef02
in order to fix some problems we've had trying to get xen.efi happy to
be NX_COMPAT.
We couldn't identify any good reason why -N was in use.
~Andrew
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