** Changed in: linux-aws (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2060992
Title:
aws: Support hibernation on Graviton
Status in linux-aws package in Ubuntu:
Fix Released
Status in linux-aws source package in Jammy:
Fix Released
Status in linux-aws source package in Mantic:
Fix Released
Status in linux-aws source package in Noble:
Fix Released
Bug description:
SRU Justification:
[Impact]
This change contains two parts, the first is adding support for
- KVM and guest support for the PSCI SYSTEM_OFF2 (hibernate) call
And the second part is:
- Guest kernel support for clean boot on demand
For KVM and guest support for the PSCI SYSTEM_OFF2 (hibernate) call:
PSCI v1.3 adds support for SYSTEM_OFF2 which is analogous to ACPI S4
state.
This will allow hosting environments to determine that a guest is
hibernated rather than just powered off, and ensure that they preserve
the virtual environment appropriately to allow the guest to resume
safely (or bump the hardware_signature in the FACS to trigger a clean
reboot instead).
For Guest kernel support for clean boot on demand:
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]
The changes for KVM and guest support for the PSCI SYSTEM_OFF2 (hibernate)
call come from:
https://lore.kernel.org/lkml/[email protected]
The changes for Guest kernel support for clean boot on demand come from:
https://lore.kernel.org/lkml/[email protected]
Latest patches have been picked from:
- noble/mantic:
https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/psci-hibernate-6.8
- jammy:
https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/psci-hibernate-5.15
[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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