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Re: [PATCH] x86/boot: adjust text gap/diff to work with 64-bytes alignment too


  • To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Thu, 9 Jan 2025 14:23:27 +0100
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  • Cc: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 09 Jan 2025 13:23:36 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 09.01.2025 14:15, Marek Marczykowski-Górecki wrote:
> Xen compiled with -mtune=generic has .text alignment set to 64-bytes.
> Having text_diff non-64-bytes-aligned breaks stuff:
> 
>     Traceback (most recent call last):
>       File 
> "/builddir/build/BUILD/xen-4.20.0-build/xen-4.20.0-rc0/xen/./tools/combine_two_binaries.py",
>  line 96, in <module>
>         raise Exception('File sizes do not match')
>     Exception: File sizes do not match: 70160 != 4080 + 66048
> 
> Adjust the numbers as suggested by Frediano to work with 64-bytes and
> even 128-bytes alignment.

And then breaking at 256? As indicated on Matrix, imo we should be able to
cope with anything up to at least PAGE_SIZE. Or we should reduce .text
alignment before linking.

> Suggested-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
> Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>

No Fixes: tag?

Jan




 


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