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Re: [PATCH] xen/arm: fix unmapped access trapping on GICv2 hardware
- To: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Wed, 18 Feb 2026 18:16:19 +0100
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- Cc: Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Wed, 18 Feb 2026 17:16:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18/02/2026 15:21, Stewart Hildebrand wrote:
> Gentle ping.
Sorry, I'm quite busy these days.
>
> To be clear, domU interrupts with vGICv2 are currently broken when
> XEN_DOMCTL_CDF_trap_unmapped_accesses is not set.
>
> On 2/5/26 14:01, Stewart Hildebrand wrote:
>> Since 4dbcb0653621, the vGICv2 CPU interface is mapped in a deferred
>> manner. On domains with XEN_DOMCTL_CDF_trap_unmapped_accesses unset on
>> GICv2 hardware, the vGICv2 CPU interface fails to be mapped. A visible
>> symptom is that a domU gets stuck at:
>>
>> [ 0.177983] smp: Bringing up secondary CPUs ...
>>
>> Move the 2nd check_p2m earlier so it's prioritized over try_handle_mmio.
>>
>> Fixes: 980aff4e8fcd ("xen/arm: Add way to disable traps on accesses to
>> unmapped addresses")
>> Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
I investigated whether the reordering is safe and it looks ok:
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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