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Re: [PATCH v2 2/7] xen/arm: Implement virt/maddr conversion in MPU system
- To: Luca Fancellu <luca.fancellu@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Mon, 17 Mar 2025 10:00:44 +0100
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- Cc: Penny Zheng <Penny.Zheng@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Wei Chen <wei.chen@xxxxxxx>
- Delivery-date: Mon, 17 Mar 2025 09:01:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16/03/2025 20:24, Luca Fancellu wrote:
>
>
> From: Penny Zheng <Penny.Zheng@xxxxxxx>
>
> virt_to_maddr and maddr_to_virt are used widely in Xen code. So
> even there is no VMSA in MPU system, we keep the interface in MPU to
> to avoid changing the existing common code.
>
> In order to do that, move the virt_to_maddr() and maddr_to_virt()
> definitions to mmu/mm.h, move the include of memory management
> subsystems (MMU/MPU) on a different place because the mentioned
> helpers needs visibility of some macro in asm/mm.h.
>
> Finally implement virt_to_maddr() and maddr_to_virt() for MPU systems
> under mpu/mm.h, the MPU version of virt/maddr conversion is simple since
> VA==PA.
>
> Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
> Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
> Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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