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



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