x86/ACPI: Preserve ACPI-table override during hibernation

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When overriding NHLT ACPI-table tests show that on some platforms
there is problem that NHLT contains garbage after hibernation/resume
cycle.

Problem stems from the fact that ACPI override performs early memory
allocation using memblock_phys_alloc_range() in
memblock_phys_alloc_range(). This memory block is later being marked as
ACPI memory block in arch_reserve_mem_area(). Later when memory areas
are considered for hibernation it is being marked as nosave in
e820__register_nosave_regions().

Fix this by marking ACPI override memory area as ACPI NVS
(Non-Volatile-Sleeping), which according to specification needs to be
saved on entering S4 and restored when leaving and is implemented as
such in kernel.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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Amadeusz Sławiński 2022-03-29 15:33:52 +02:00 • committed by Rafael J. Wysocki

parent 467df4cfdc

commit 84958f38d8

1 changed files with 1 additions and 1 deletions

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arch/x86/kernel/acpi/boot.c

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