linux-kernel - [PATCH v2 0/7] Enhance the hv_vmbus driver to support hibernation

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Date:   Wed, 31 Jul 2019 17:52:00 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH v2 0/7] Enhance the hv_vmbus driver to support hibernation

Hi,
This is the first patchset to enable hibernation when Linux runs on Hyper-V.

A second patchset to enhance the high-level VSC drivers (hv_netvsc,
hv_storvsc, etc.) for hibernation will be posted later. The second patchset
depends on this first patchset, so I hope this pathset can be accepted soon.

The changes in this patchset are mostly straightforward new code that only
runs when the VM enters hibernation, so IMHO it's pretty safe to have this
patchset, because the hibernation feature never worked for Linux VM running
on Hyper-V.

The patchset is rebased on the branch hyperv-next of
https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git
and can also cleanly apply to Linus's tree.

Hi Greg, tglx,
I hope the patchset can go through Sasha's hyperv/linux.git tree, because
the changes belong to the hv code and they need to be together to work
properly.

Michael Kelley reviewed the v1 of the patchset, so I added his Reviewed-by
for patch 1, 2, 3 and 7. Michael, please review the other 3 patches again,
and give your Reviewed-by if the updated version is ok to you.

Changes in v2:
  Patch 3: Improved the changelog and added a comment.

  Patch 4: Remove the "hv_stimer_cleanup" in hv_synic_suspend(), because I 
           suppose https://lkml.org/lkml/2019/7/27/5 will be accepted. Also
           improved changelog and the comment.

  Patch 5: Fixed the third argument of print_hex_dump_debug(). Also improved
           the changelog.

  Patch 6: Improved the changelog and the comment. Added a check for the
           'vmbus_proto_version' in vmbus_bus_resume().

Thanks,
Dexuan

Dexuan Cui (7):
  x86/hyper-v: Suspend/resume the hypercall page for hibernation
  clocksource/drivers: Suspend/resume Hyper-V clocksource for
    hibernation
  Drivers: hv: vmbus: Break out synic enable and disable operations
  Drivers: hv: vmbus: Suspend/resume the synic for hibernation
  Drivers: hv: vmbus: Ignore the offers when resuming from hibernation
  Drivers: hv: vmbus: Suspend/resume the vmbus itself for hibernation
  Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for
    hibernation

 arch/x86/hyperv/hv_init.c          |  34 +++++++++
 drivers/clocksource/hyperv_timer.c |  25 +++++++
 drivers/hv/channel_mgmt.c          |  29 +++++++-
 drivers/hv/connection.c            |   3 +-
 drivers/hv/hv.c                    |  66 ++++++++++--------
 drivers/hv/hyperv_vmbus.h          |   4 ++
 drivers/hv/vmbus_drv.c             | 138 +++++++++++++++++++++++++++++++++++++
 include/linux/hyperv.h             |   3 +
 8 files changed, 270 insertions(+), 32 deletions(-)

-- 
1.8.3.1