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Re: [PATCH 8/9] xen/arm: Allow the user to build Xen with USBAN
- To: Julien Grall <julien@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Mon, 26 Jun 2023 13:56:34 +0200
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- Cc: <Luca.Fancellu@xxxxxxx>, <Henry.Wang@xxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Mon, 26 Jun 2023 11:56:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25/06/2023 22:49, Julien Grall wrote:
>
>
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> UBSAN has been enabled a few years ago on x86 but was never
> enabled on Arm because the final binary is bigger than 2MB (
> the maximum we can currently handled).
>
> With the recent rework, it is now possible to grow Xen over 2MB.
> So there is no more roadblock to enable Xen other than increasing
> the reserved area.
>
> On my setup, for arm32, the final binaray was very close to 4MB.
> Furthermore, one may want to enable USBAN and GCOV which would put
> the binary well-over 4MB (both features require for some space).
> Therefore, increase the size to 8MB which should us some margin.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
>
> ----
>
> The drawback with this approach is that we are adding 6 new
> page-table (3 for boot and 3 for runtime) that are statically
> allocated. So the final Xen binary will be 24KB bigger when
> neither UBSAN nor GCOV.
>
> If this is not considered acceptable, then we could make the
> size of configurable in the Kconfig and decide it based on the
> features enabled.
Both of these features are enabled only in a debug build of Xen, so
another option would be to increase Xen size only for a debug build.
~Michal
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