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Re: [PATCH v1 1/2] arm/mpu: Enable is_xen_heap_page and co for ARM_32

To: Hari Limaye <hari.limaye@xxxxxxx>, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>

From: Ayan Kumar Halder <ayankuma@xxxxxxx>

Date: Thu, 14 Aug 2025 09:24:16 +0100

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Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, "Volodymyr Babchuk" <Volodymyr_Babchuk@xxxxxxxx>

Delivery-date: Thu, 14 Aug 2025 08:24:27 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 12/08/2025 11:30, Hari Limaye wrote:

Hi Ayan,

Hi Hari,

On Thu, Aug 07, 2025 at 06:45:28PM +0000, Ayan Kumar Halder wrote:
In case of ARM_32, all of the RAM will be covered by a permanent contiguous
mapping (where VA == PA) and there will be a single heap. Thus, the memory
allocated from Xen heap uses PGC_xen_heap.
This is similar to the scenario described for
"CONFIG_SEPARATE_XENHEAP=n W/ DIRECT MAP OF ALL RAM" in common/page_alloc.c.

Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
---

This patch breaks the build for ARM_32, CONFIG_MMU targets due to
multiple definition of `is_xen_heap_page` and `is_xen_heap_mfn`. The
pre-existing definitions are located at xen/arch/arm/include/asm/mmu/mm.h:30:9

Thanks for checking this and apologies for the build break. I should

have tested this before sending.

I have sent out [PATCH v2 0/2] R52 MPU support (for "Third series for R82 MPU")

This time I tested

- Ayan F

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