Re: [PATCH v3 04/11] x86/xen: add system core suspend and resume callbacks

[boris.ostrovsky@xxxxxxxxxx]

On 8/21/20 6:27 PM, Anchal Agarwal wrote:
> From: Munehisa Kamata <kamatam@xxxxxxxxxx>
>
> Add Xen PVHVM specific system core callbacks for PM
> hibernation support. The callbacks suspend and resume
> Xen primitives like shared_info, pvclock and grant table.
> These syscore_ops are specifically for domU hibernation.
> xen_suspend() calls syscore_suspend() during Xen suspend
> operation however, during xen suspend lock_system_sleep()
> lock is taken and thus system cannot trigger hibernation.
> These system core callbacks will be called only from the
> hibernation context.


Well, they can be called from Xen suspend too, which is why you have the
checks in the beginning.


-boris