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Re: [PATCH 28/36] xen/arm: introduce xen_map_text_rw
- To: Marco Solieri <marco.solieri@xxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 7 Mar 2022 08:39:03 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Marco Solieri <marco.solieri@xxxxxxxxxx>, Andrea Bastoni <andrea.bastoni@xxxxxxxxxxxxxxx>, Luca Miccio <lucmiccio@xxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 07 Mar 2022 07:39:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.03.2022 18:46, Marco Solieri wrote:
> From: Luca Miccio <lucmiccio@xxxxxxxxx>
>
> Introduce two new arm specific functions to temporarily map/unmap the
> Xen text read-write (the Xen text is mapped read-only by default by
> setup_pagetables): xen_map_text_rw and xen_unmap_text_rw.
>
> There is only one caller in the alternative framework.
>
> The non-colored implementation simply uses __vmap to do the mapping. In
> other words, there are no changes to the non-colored case.
>
> The colored implementation calculates Xen text physical addresses
> appropriately, according to the coloring configuration.
>
> Export vm_alloc because it is needed by the colored implementation of
> xen_map_text_rw.
I'm afraid I view vm_alloc() as strictly an internal function to
vmap.c. Even livepatching infrastructure has got away without making
it non-static.
Jan
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