NACK: [m/n][linux-aws] aws: Guest kernel support for clean boot on demand

[Philip Cox]

This should have been NACK'ed earlier.  It was sent as a PR which has been
merged.


On Fri, Apr 19, 2024 at 1:35 PM Philip Cox <philip.cox at canonical.com> wrote:

> BugLink: https://bugs.launchpad.net/bugs/2060992
>
> SRU Justification:
>
> [Impact]
> The FACS field in the ACPI table is optional, but can be used communicate
> the hardware_signature field. If this field changes on resuming from a
> hibernation a clean reboot should happen rather than the resume from
> hibernation.
>
> On hardware reduced platforms[0] this field may exist but it is not
> exposed currently.
>
> [Fix]
> Expose this field even on hardware reduced platforms.
>
> https://lore.kernel.org/lkml/20240312134148.727454-1-dwmw2@infradead.org
>
> [Test Plan]
> AWS test.
>
> [Where problems could occur]
> If on hardware reduced platforms that incorrectly support/advertise the
> FACS field, hibernation may break if it returns a hardware signature that
> changes.
>
> [Other info]
> SF# 00383181
>
> [0]: See Section 4.1 of the ACPI spec for info on hardware-reduced
> platforms.
>
> https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/04_ACPI_Hardware_Specification/ACPI_Hardware_Specification.html
>
>
>
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