[xen staging-4.21] xen: Fix EFI buildid alignment

[patchbot@xxxxxxx]

commit 6adf28094f9dacf35bee1f6bdc85ecddca52d944
Author:     Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Tue Nov 25 16:09:40 2025 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Nov 25 16:09:40 2025 +0100

    xen: Fix EFI buildid alignment
    
    Old binutils get confused about .buildid overlapping (in VA space) with
    earlier section. That confusion results in weird errors down the road,
    like this one:
    
        objcopy: xen.efi: Data Directory size (1c) exceeds space left in 
section (8)
    
    While the bug is fixed in later binutils version, force alignment of the
    buildid to avoid overlapping and make it work with older versions too.
    This can be reverted once toolchain base is raised at or above binutils
    2.36.
    
    Details at 
https://lore.kernel.org/xen-devel/3TMd7J2u5gCA8ouIG_Xfcw7s5JKMG06XsDIesEB3Fi9htUJ43Lfl057wXohlpCHcszqoCmicpIlneEDO26ZqT8QfC2Y39VxBuqD3nS1j5Q4=@trmm.net/T/#u
    
    Fixes: eee5909e9d1e ("x86/EFI: use less crude a way of generating the build 
ID")
    Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 26b111cc22b7e36ae5d72a17758b3ec6a1156432
    master date: 2025-11-20 14:29:57 +0000
---
 xen/arch/x86/xen.lds.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index 5d02f83a40..527872a6db 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -171,6 +171,8 @@ SECTIONS
        __note_gnu_build_id_end = .;
   } PHDR(note) PHDR(text)
 #elif defined(BUILD_ID_EFI)
+  /* Workaround bug in binutils < 2.36 */
+  . = ALIGN(32);
   DECL_SECTION(.buildid) {
        __note_gnu_build_id_start = .;
        *(.buildid)
--
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