Re: [Xen-devel] [livepatch-build-tools part2 v2 4/6] livepatch-build: detect special section group sizes

[Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>]

On 8/8/19 1:29 PM, Pawel Wieczorkiewicz wrote:
> Hard-coding the special section group sizes is unreliable. Instead,
> determine them dynamically by finding the related struct definitions
> in the DWARF metadata.
>
> This is a livepatch backport of kpatch upstream commit [1]:
> kpatch-build: detect special section group sizes 170449847136a48b19fc
>
> Xen only deals with alt_instr, bug_frame and exception_table_entry
> structures, so sizes of these structures are obtained from xen-syms.
>
> This change is needed since with recent Xen the alt_instr structure
> has changed size from 12 to 14 bytes.
>
> [1] 
> https://github.com/jpoimboe/kpatch/commit/170449847136a48b19fcceb19c1d4d257d386b56
>
> Signed-off-by: Pawel Wieczorkiewicz <wipawel@xxxxxxxxx>
> Reviewed-by: Bjoern Doebel <doebel@xxxxxxxxx>
> Reviewed-by: Martin Mazein <amazein@xxxxxxxxx>
> ---
> v2:
> * Applied suggestions from Ross:
>    - moved the livepatch-build hunk after build_full() call and
>      re-using newly built xen-syms
>    - dropped the redundant bug_frames_3_group_size()
Reviewed-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>

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