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Re: [PATCH v2] tools/libxg: Don't gunzip the guests initrd
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 19 Dec 2024 09:41:19 +0100
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 19 Dec 2024 08:41:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.12.2024 19:54, Andrew Cooper wrote:
> Decompressing the kernel is necessary to inspect the ELF notes, but the
> dombuilder will gunzip() secondary modules too. Specifically gunzip(), no
> other decompression algorithms.
>
> This may have been necessary in the dim and distant past, but it is broken
> today. Linux specifically supports concatenating CPIO fragments of differing
> compressions, and any attempt to interpret it with a single algorithm may
> corrupt later parts.
>
> This was an unexpected discovery while trying to test Xen's gunzip()
> logic (Xen as a PVH guest, with a gzipped XTF kernel as dom0).
>
> Intepreting secondary modules *should* be left as an exersize to the guest.
Nit: "Interpreting" and "exercise" and ...
> This reduces work done in dom0.
>
> This is not expected to cause a practical different to guests these days.
... "difference"?
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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