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Re: [PATCH v17 1/4] xen/arm: Implement PSCI SYSTEM_SUSPEND call for guests
- To: Mykola Kvach <xakep.amatop@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Tue, 31 Mar 2026 10:52:24 +0200
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- Cc: Mykola Kvach <mykola_kvach@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 31 Mar 2026 08:52:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24/03/2026 13:26, Mykola Kvach wrote:
> From: Mykola Kvach <mykola_kvach@xxxxxxxx>
>
> Add support for the PSCI SYSTEM_SUSPEND function in the vPSCI interface,
> allowing guests to request suspend via the PSCI v1.0+ SYSTEM_SUSPEND call
> (both 32-bit and 64-bit variants).
>
> Implementation details:
> - Add SYSTEM_SUSPEND function IDs to PSCI definitions
> - Trap and handle SYSTEM_SUSPEND in vPSCI
> - Reject SYSTEM_SUSPEND for the hardware domain to avoid host shutdown
> - Require all secondary VCPUs to be offline before suspend
> - Split arch_set_info_guest() into arch_vcpu_validate_guest_context() and
> arch_vcpu_apply_guest_context() for reuse by vPSCI
> - Add vpsci_build_guest_context() helper and store prevalidated context in
> resume_ctx; resume applies it and frees it
> - Add arch_domain_resume() function is an architecture-specific hook that
> is invoked during domain resume to perform any necessary setup or
> restoration steps required by the platform.
>
> Usage:
>
> For Linux-based guests, suspend can be initiated with:
> echo mem > /sys/power/state
> or via:
> systemctl suspend
>
> Resume from control domain:
> xl resume <domain>
>
> Signed-off-by: Mykola Kvach <mykola_kvach@xxxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
I'll do the change Jan mentioned on commit.
~Michal
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