[PATCH 00/11] virtio: Support for hibernation (S4)

[Amit Shah <amit.shah@redhat.com>]

Hello,

These patches add support for S4 to virtio (pci) and all drivers.  The
patches are based on the virtio-console patch series in Rusty's queue.

For each driver, all vqs are removed before hibernation, and then
re-created after restore.

All the drivers in testing work fine:

* virtio-blk is used for the only disk in the VM, IO works fine before
  and after.

* virtio-console: port IO keeps working fine before and after.
  * If a port is waiting for data from the host (blocking read(2)
    call), this works fine in both the cases: host-side connection is
    available or unavailable after resume.  In case the host-side
    connection isn't available, the blocking call is terminated.  If
    it is available, the call continues to remain in blocked state
    till further data arrives.

* virtio-net: ping remains active across S4.  One packet is lost.
  (Current qemu.git has a regression in slirp code causing qemu
  segfault, commit 1ab74cea060 is the offender).

* virtio-balloon: Works fine before and after.  Forgets the ballooned
  value across S4.  If it's desirable to maintain the ballooned value,
  a new config option can be created to do this.

All in all, this looks pretty good.

Please review and apply.


Amit Shah (11):
  virtio: pci: switch to new PM API
  virtio-pci: add PM notification handlers for restore, freeze, thaw,
    poweroff
  virtio: console: Move out vq and vq buf removal into separate
    functions
  virtio: console: Add freeze and restore handlers to support S4
  virtio: blk: Move out vq initialization to separate function
  virtio: blk: Add freeze, restore handlers to support S4
  virtio: net: Move out vq initialization into separate function
  virtio: net: Move out vq and vq buf removal into separate function
  virtio: net: Add freeze, restore handlers to support S4
  virtio: balloon: Move out vq initialization into separate function
  virtio: balloon: Add freeze, restore handlers to support S4

 drivers/block/virtio_blk.c      |   36 ++++++++++--
 drivers/char/virtio_console.c   |  124 ++++++++++++++++++++++++++++++---------
 drivers/net/virtio_net.c        |   98 ++++++++++++++++++++++---------
 drivers/virtio/virtio_balloon.c |   65 +++++++++++++++------
 drivers/virtio/virtio_pci.c     |   57 +++++++++++++++++-
 include/linux/virtio.h          |    4 +
 6 files changed, 301 insertions(+), 83 deletions(-)

-- 
1.7.6.2