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Re: [PATCH 2/6] Align all sections to 4KB
- To: Frediano Ziglio <freddy77@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 5 Jun 2026 09:45:29 +0200
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- Cc: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 05 Jun 2026 07:45:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.06.2026 12:16, Frediano Ziglio wrote:
> On Tue, 2 Jun 2026 at 13:09, Jan Beulich <jbeulich@xxxxxxxx> wrote:
>> On 29.05.2026 17:35, Frediano Ziglio wrote:
>>> --- a/xen/arch/x86/xen.lds.S
>>> +++ b/xen/arch/x86/xen.lds.S
>>> @@ -162,8 +162,8 @@ SECTIONS
>>> __note_gnu_build_id_end = .;
>>> } PHDR(note) PHDR(text)
>>> #elif defined(BUILD_ID_EFI)
>>> - /* Workaround bug in binutils < 2.36 */
>>> - . = ALIGN(32);
>>> + /* align to satisfy UEFI CA memory mitigation */
>>> + . = ALIGN(PAGE_SIZE);
>>> DECL_SECTION(.buildid) {
>>> __note_gnu_build_id_start = .;
>>> *(.buildid)
>>> @@ -330,6 +330,7 @@ SECTIONS
>>> __2M_rwdata_end = ALIGN(SECTION_ALIGN);
>>>
>>> #ifdef EFI
>>> + . = ALIGN(PAGE_SIZE);
>>> .reloc ALIGN(4) : {
>>> __base_relocs_start = .;
>>> *(.reloc)
>>> @@ -355,6 +356,7 @@ SECTIONS
>>> VIRT_START &= 0;
>>> ALT_START &= 0;
>>>
>>> + . = ALIGN(PAGE_SIZE);
>>> .sbat (NOLOAD) : { *(.sbat) }
>>> #elif defined(XEN_BUILD_EFI)
>>> /*
>>
>> You say "all sections" in the title, yet this is not covering e.g. debug
>> info.
>
> I will change to "all loadable sections". debug sections are not
> loadable so they don't cause an issue.
Please try to be precise there, as some aspects are subtle. As per my
understanding, like .reloc all .debug_* are loadable (and may be loaded).
The IMAGE_SCN_MEM_DISCARDABLE flag merely means they can be discarded at
a certain point after image loading (for .reloc in particular: after
relocations were processed).
Jan
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