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Re: [PATCH for-4.22?] x86/EFI: arrange for non-discardable .reloc in xen.efi
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 17 Jun 2026 12:37:38 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Wed, 17 Jun 2026 10:37:47 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.06.2026 12:29, Roger Pau Monné wrote:
> On Tue, Jun 16, 2026 at 06:17:54PM +0200, Jan Beulich wrote:
>> Loaders respecting IMAGE_SCN_MEM_DISCARDABLE would not load such sections,
>> yet we need to access it ourselves when switching out of "physical mode".
>> Leverage behavior new to GNU ld 2.46: Any contribution to .reloc which
>> doesn't have the discardable flag set (which cannot even be expressed in
>> ELF) will yield the output section also non-discardable.
>>
>> Since for intermediate binaries we don't care about section attributes,
>> link in the new object only on the final linking pass.
>
> I'm not sure I follow. Xen already does generate a custom .reloc
> section without the IMAGE_SCN_MEM_DISCARDABLE attribute when using
> the mkreloc utility, and hence the .reloc section should never be
> marked as discardable?
mkreloc is used only when we recognize the linker to be incapable of
producing (correct) base relocations. As a modern linker is required for
the desired IMAGE_SCN_MEM_DISCARDABLE handling for .reloc, mkreloc
wouldn't normally be used there. Hence no .reloc section with the wanted
property.
Jan
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