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Re: [PATCH v3 2/4] xen: make VMAP only support in MMU system
- To: Ayan Kumar Halder <ayankuma@xxxxxxx>, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 20 Aug 2024 14:51:15 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Penny Zheng <penny.zheng@xxxxxxx>, Wei Chen <wei.chen@xxxxxxx>, sstabellini@xxxxxxxxxx, bertrand.marquis@xxxxxxx, michal.orzel@xxxxxxx, Volodymyr_Babchuk@xxxxxxxx, Julien Grall <julien@xxxxxxx>
- Delivery-date: Tue, 20 Aug 2024 12:51:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.08.2024 13:48, Ayan Kumar Halder wrote:
> So I will do :-
>
> 1. HARDEN_BRANCH_PREDICTOR will depend on MMU.
>
> 2. ARCH_VMAP will be selected by PPC and RISCV. The reason is below.
>
> 3. xen/common/vmap.c will be conditionally compiled on ARCH_VMAP and the
> "#ifdef VMAP_VIRT_START .. endif" will be from removed within the file.
> As VMAP_VIRT_START is defined by RISCV and PPC, thus #2 is needed.
>
> Julien, Jan :- Please let me know if you are ok with #3. This was in
> response to Michal's comment. While his suggestion makes sense, I am not
> sure if extending the changes to other architectures is the correct
> approach. Or do you prefer keeping xen/common/vmap.c unchanged.
No, the VMAP_VIRT_START thing was, from all I recall, merely to cover
for the lack of a way to exclude building of the file from Makefile.
After all this pre-dates the introduction of kconfig in Xen.
And yes, suitably covering PPC and RISC-V is The Right Thing To Do (tm);
their maintainers can shout if they disagree.
Jan
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