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Re: [PATCH v10 04/13] xen/arm: gic-v3: Implement GICv3 suspend/resume functions
- To: Mykola Kvach <xakep.amatop@xxxxxxxxx>
- From: Luca Fancellu <Luca.Fancellu@xxxxxxx>
- Date: Thu, 28 May 2026 17:20:34 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Mykola Kvach <mykola_kvach@xxxxxxxx>, 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, 28 May 2026 17:22:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v10 04/13] xen/arm: gic-v3: Implement GICv3 suspend/resume functions
Hi Mykola,
> On 21 May 2026, at 18:45, Mykola Kvach <xakep.amatop@xxxxxxxxx> wrote:
>
> From: Mykola Kvach <mykola_kvach@xxxxxxxx>
>
> System suspend may lead to a state where GIC would be powered down.
> Therefore, Xen should save/restore the context of GIC on suspend/resume.
>
> Note that the context consists of states of registers which are
> controlled by the hypervisor. Other GIC registers which are accessible
> by guests are saved/restored on context switch.
>
> Before continuing suspend, also verify that the physical CPU interface
> has no Group 1 active-priority state left. Use ICC_CTLR_EL1.PRIbits to
> decide which ICC_AP1R<n>_EL1 registers are implemented, so Xen does not
> read an unimplemented AP1R register.
>
> Signed-off-by: Mykola Kvach <mykola_kvach@xxxxxxxx>
> ---
Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Cheers,
Luca
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