ACK: [SRU][G/aws][PULL] aws: update Xen hibernation patch set

[Kelsey Skunberg]

LGTM. Verified applies cleanly and passes build test. Everyhting else
seems sane, too.

Acked-by: Kelsey Skunberg <kelsey.skunberg at canonical.com>

On 2021-02-24 15:41:23 , Andrea Righi wrote:
> BugLink: https://bugs.launchpad.net/bugs/1913410
> BugLink: https://bugs.launchpad.net/bugs/1906850
> 
> [Impact]
> 
> Amazon maintains a custom kernel patch set to properly support
> hibernation in Xen.
> 
> This patch set is available in the amazonlinux kernel git repository:
> https://github.com/amazonlinux/linux.git
> 
> It is important to periodically re-sync our version of this patch set
> with the new versions that are pushed by Amazon and make sure we include
> all the required patches and drop the old ones.
> 
> This pull request is a revert of the old xen/hibernation patch set +
> applying the new patch set.
> 
> Many of these patches required a small backporting activity, mostly due
> to context adjustments (no functional changes).
> 
> [Test case]
> 
> A test kernel with this new patch set applied has been extensively
> tested in the AWS cloud both by our testing scripts (multiple
> hibernation/resume cycles) and by Amazon with positive results.
> 
> [Fix]
> 
> Revert the old xen/hibernation patch set + apply the new patch set.
> 
> [Regression potential]
> 
> All the changes are touching the Xen (guest) code and hibernation,
> so we can only see potential regressions in these subsystems.
> 
> --
> 
> The following changes since commit 497a6691ca053fcb53b0a971317be9736c54f675:
> 
>   UBUNTU: Ubuntu-aws-5.8.0-1024.26 (2021-02-10 15:04:42 -0600)
> 
> are available in the Git repository at:
> 
>   git://git.launchpad.net/~arighi/ubuntu/+source/linux-aws/+git/groovy f7396c3d5475959ae21011425f39bcaf02cb91f1
> 
> for you to fetch changes up to f7396c3d5475959ae21011425f39bcaf02cb91f1:
> 
>   UBUNTU: SAUCE: x86: tsc: avoid system instability in hibernation (2021-02-24 15:10:41 +0100)
> 
> ----------------------------------------------------------------
> Anchal Agarwal (3):
>       UBUNTU: SAUCE: x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume
>       UBUNTU: SAUCE: xen: Introduce wrapper for save/restore sched clock offset
>       UBUNTU: SAUCE: xen: Update sched clock offset to avoid system instability in hibernation
> 
> Andrea Righi (11):
>       Revert "UBUNTU: SAUCE: xen: Update sched clock offset to avoid system instability in hibernation"
>       Revert "UBUNTU: SAUCE: xen: Introduce wrapper for save/restore sched clock offset"
>       Revert "UBUNTU: SAUCE: x86/xen: save and restore steal clock"
>       Revert "UBUNTU: SAUCE: xen/time: introduce xen_{save,restore}_steal_clock"
>       Revert "UBUNTU: SAUCE: xen-netfront: add callbacks for PM suspend and hibernation"
>       Revert "UBUNTU: SAUCE: xen-blkfront: add callbacks for PM suspend and hibernation"
>       Revert "UBUNTU: SAUCE: x86/xen: add system core suspend and resume callbacks"
>       Revert "UBUNTU: SAUCE: x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume"
>       Revert "UBUNTU: SAUCE: xenbus: add freeze/thaw/restore callbacks support"
>       Revert "UBUNTU: SAUCE: xen/manage: keep track of the on-going suspend mode"
>       UBUNTU: SAUCE: xen-netfront: prevent unnecessary close on hibernate
> 
> Eduardo Valentin (1):
>       UBUNTU: SAUCE: x86: tsc: avoid system instability in hibernation
> 
> Munehisa Kamata (7):
>       UBUNTU: SAUCE: xen/manage: keep track of the on-going suspend mode
>       UBUNTU: SAUCE: xenbus: add freeze/thaw/restore callbacks support
>       UBUNTU: SAUCE: x86/xen: add system core suspend and resume callbacks
>       UBUNTU: SAUCE: xen-netfront: add callbacks for PM suspend and hibernation support
>       UBUNTU: SAUCE: xen-blkfront: add callbacks for PM suspend and hibernation
>       UBUNTU: SAUCE: xen/time: introduce xen_{save,restore}_steal_clock
>       UBUNTU: SAUCE: x86/xen: save and restore steal clock
> 
>  arch/x86/kernel/tsc.c             | 29 +++++++++++++++++++
>  drivers/block/xen-blkfront.c      | 61 +++++++++++++++++++--------------------
>  drivers/net/xen-netfront.c        | 11 ++++++-
>  drivers/xen/xenbus/xenbus_probe.c | 19 ++++++------
>  include/linux/sched/clock.h       |  5 ++++
>  kernel/sched/clock.c              |  4 +--
>  6 files changed, 86 insertions(+), 43 deletions(-)
> 
> -- 
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