[PATCH v4 00/12] Enhance the hv_vmbus driver to support hibernation

[Dexuan Cui]

Hi all,
The patchset is to enhance hv_vmbus to support hibernation when Linux VM
runs on Hyper-V. A second patchset to enhance the high-level VSC drivers
(hv_netvsc, hv_storvsc, etc.) for hibernation will be posted after this
patchset is acceped. If you want to test this hibernation feaure, all the
needed patches can be found on my github branch:
https://github.com/dcui/linux/commits/decui/hibernation/2019-0830/v4/v5.3-rc6-plus

This patchset is based on v5.3-rc6, and can also cleanly apply to -rc7.

Please review.

Hi tglx,
I hope all the 12 patchset, including the below 3 patches,

[PATCH v4 01/12] x86/hyper-v: Suspend/resume the hypercall page for hibernation
[PATCH v4 02/12] x86/hyper-v: Implement hv_is_hibernation_supported()
[PATCH v4 03/12] clocksource/drivers: Suspend/resume Hyper-V

can go through Sasha's hyperv/linux.git tree, since all the changes belong
to the hv stuff. However, if you think it's better for these 3 patches to go
through your tip.git tree, it also works for me.

Hi Michael,
I added your Reviewed-by's for patch 1, 3~7, 9~10, since you have reviewed
these patches. Please review the v4 of the others: 2, 8, 11 and 12.

Thanks,
Dexuan

Changes in v4:
  Patch 2: Enhanced the changelog.

  Patch 8: Moved find_primary_channel_by_offer() to channel_mgmt.c, where
           it's used.

  Patch 10: Improved the changelog (typo) and comment.

  Patch 11: Removed WARN_ON_ONCE(), added a comment for the case
            nr_chan_close_on_suspend == 0.

  Patch 12: Improved the comment.

Changes in v3:
  Patch 2: Add a new API hv_is_hibernation_supported().

  Patch 6: Add a new helper function is_sub_channel().

  Patch 8: Find the old channels via Instance GUID rather than the RELID.

  Patch 10: Add code to clean up hv_sock channels by force

  Patch 11: Add code to wait in the suspend path: all the hv_sock channels
            and sub-channels should be cleaned up first before Linux sends
            the VMBUS UNLOAD message.

  Patch 12: Add code to fix up the old primary channels before further
            resuming.

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().


Dexuan Cui (12):
  x86/hyper-v: Suspend/resume the hypercall page for hibernation
  x86/hyper-v: Implement hv_is_hibernation_supported()
  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: Add a helper function is_sub_channel()
  Drivers: hv: vmbus: Implement suspend/resume for VSC drivers 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: Clean up hv_sock channels by force upon suspend
  Drivers: hv: vmbus: Suspend after cleaning up hv_sock and sub channels
  Drivers: hv: vmbus: Resume after fixing up old primary channels

 arch/x86/hyperv/hv_init.c          |  41 ++++++
 drivers/clocksource/hyperv_timer.c |  25 ++++
 drivers/hv/channel_mgmt.c          | 161 +++++++++++++++++++---
 drivers/hv/connection.c            |   8 +-
 drivers/hv/hv.c                    |  66 +++++----
 drivers/hv/hyperv_vmbus.h          |  30 +++++
 drivers/hv/vmbus_drv.c             | 265 +++++++++++++++++++++++++++++++++++++
 include/asm-generic/mshyperv.h     |   2 +
 include/linux/hyperv.h             |  16 ++-
 9 files changed, 565 insertions(+), 49 deletions(-)

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1.8.3.1