PM: hibernate: Add an arch hook for preventing hibernation

Add a hook to allow arch code disable hibernation. On arm64, with an RMM
active, there could be pages that are delegated to the "Realm" security
state. Any access to them are fatal (e.g., hibernate save image or
restoring an image to a delegated page). pKVM host also has its
restrictions on enabling hibernation.

Add a weak arch hook to let the architectures have a say.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Pavel Machek <pavel@kernel.org>
Cc: linux-pm@vger.kernel.org
Cc: Sudeep Holla <sudeep.holla@kernel.org>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index b02876f1ae38..a3815027773c 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -401,6 +401,7 @@ int hibernate_quiet_exec(int (*func)(void *data), void *data);
 int hibernate_resume_nonboot_cpu_disable(void);
 int arch_hibernation_header_save(void *addr, unsigned int max_size);
 int arch_hibernation_header_restore(void *addr);
+bool arch_hibernation_available(void);
 
 #else /* CONFIG_HIBERNATION */
 static inline void register_nosave_region(unsigned long b, unsigned long e) {}