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Re: [PATCH] xen/dt: Don't advertise Xen static-heap region to hwdom
- To: Kuan-Wei Chiu <visitorckw@xxxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Fri, 30 Oct 2026 09:49:13 +0100
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- Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>
- Delivery-date: Fri, 30 Oct 2026 08:49:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30-Oct-26 04:42, Kuan-Wei Chiu wrote:
> On Thu, Oct 29, 2026 at 11:43:05AM +0100, Michal Orzel wrote:
>> bootinfo.reserved_mem is used to store different types of memory that
>> Xen considers as reserved: domU static mem, normal /reserved-memory,
>> FDT memreserve and Xen static heap. make_memory_node(), invoked during
>> FDT generation for a hwdom for reserved memory, only skips the domU
>> static memory and FDT memreserve. This results in advertising Xen static
>> heap (if used) to a hwdom as /memory. This memory is not mapped in P2M
>> and guest attempt to access it fails. Interestingly, if the
>> /reserved-memory node is placed after /chosen, there is no problem because
>> of the check at the beginning of make_memory_node() that finds the first
>> memory range using the correct type.
>>
>> Fixes: 4596329291f5 ("docs, xen/arm: Introduce static heap memory")
>> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
>
> Reviewed-by: Kuan-Wei Chiu <visitorckw@xxxxxxxxx>
>
> I guess git will treat this as conflicting with my dt patch when
> applying. Let me know if this gets merged first and you would like me
> to rebase and resend.
It will likely get merged first but don't worry. I can solve the conflict when I
start reviewing your patch.
~Michal
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