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Re: [PATCH 1/2] x86/video: add boot_video_info offset generation to asm-offsets


  • To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Tue, 2 Apr 2024 11:38:30 +0200
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 02 Apr 2024 09:38:35 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 28.03.2024 16:35, Roger Pau Monne wrote:
> Currently the offsets into the boot_video_info struct are manually encoded in
> video.S, which is fragile.  Generate them in asm-offsets.c and switch the
> current code to use those instead.

Just to mention it (without asking for immediate action): Defining boot_vid_info
in assembly code then is as fragile. Moving to C would likely be problematic
because it needs to be in the trampoline range. But at least its size should (at
some point) perhaps better be tied to the C struct's sizeof(). The fields, with
some effort, could also be converted using the new BVI_* constants. That would
still leave the field sizes; maybe those could at least be cross-checked by some
BUILD_BUG_ONs.

Jan



 


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