Re: [Xen-devel] [PATCH] xen/arm: Register re-mapped Xen area as a temporary virtual region

[Julien Grall <julien.grall@xxxxxxx>]

Hello Wei,

Title: I would add alternative to make clear this is touching alternative.

On 14/03/17 09:27, Wei Chen wrote:
> While we're doing apply_alternatives, we will generate new instructions
> if required. The new instructions need to update the Xen text section,
> but Xen text section is read-only. So we re-map Xen to a new virtual
> address to enable write access.
>
> The targets of the new generated instructions are located in this
> re-mapped Xen area. But we haven't register this area as a virtual
> region, so the checking code determines the targets are not in the
> Xen text section, the new instructions could not be generated.
>
> In this patch, we register the re-mapped Xen area as a temporary
> virtual region to make the new instructions can be generated
> successfully.
>
> Signed-off-by: Wei Chen <Wei.Chen@xxxxxxx>
> ---
This patch would need to be backported on Xen 4.8.

For the rest, see Konrad's comment.

Regards,

--
Julien Grall

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