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Re: [PATCH 5/6] x86/efi: avoid a relocation in efi_arch_post_exit_boot()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Frediano Ziglio <freddy77@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 5 Jun 2026 09:57:57 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 05 Jun 2026 07:57:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.06.2026 16:48, Andrew Cooper wrote:
> On 02/06/2026 1:23 pm, Jan Beulich wrote:
>> On 29.05.2026 17:35, Frediano Ziglio wrote:
>>> From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>>>
>>> Instead of using the absolute __start_xen address, calculate it as an
>>> offset from the current instruction pointer. The relocation would be
>>> problematic if the loader has acknowledged the Xen image section
>>> attributes, and mapped .init.text with just read and execute permissions.
>> How can the loader respect what .init.text wants when it sees only .init,
>> prior to the subsequent patch? Was the series meant to be ordered
>> differently?
>
> No. Xen explodes if you split .init and this relocation is present.
>
> It's the part where Xen undoes the relocation that the UEFI loader did.
>
> Removing this relocation is necessary to make it safe to split .init.
Okay, so ordering of the series is intentional as is, but the description
here is imprecise.
Jan
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