On 8/21/20 6:27 PM, Anchal Agarwal wrote:

From: Munehisa Kamata <redacted>

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