Implement the infrastructure to support datapath switching during live
migration involving SR-IOV devices.

1. This patch is based off on the current VIRTIO_NET_F_STANDBY feature
   bit and MAC address device pairing.

2. This set of events will be consumed by userspace management software
   to orchestrate all the hot plug and datapath switching activities.
   This scheme has the least QEMU modifications while allowing userspace
   software to build its own intelligence to control the whole process
   of SR-IOV live migration.

3. While the hidden device model (viz. coupled device model) is still
   being explored for automatic hot plugging (QEMU) and automatic datapath
   switching (host-kernel), this series provides a supplemental set
   of interfaces if management software wants to drive the SR-IOV live
   migration on its own. It should not conflict with the hidden device
   model but just offers simplicity of implementation.


Si-Wei Liu (2):
  vfio-pci: Add FAILOVER_PRIMARY_CHANGED event to shorten downtime during failover
  pci: query command extension to check the bus master enabling status of the failover-primary device

Sridhar Samudrala (1):
  virtio_net: Add VIRTIO_NET_F_STANDBY feature bit.

Venu Busireddy (2):
  virtio_net: Add support for "Data Path Switching" during Live Migration.
  virtio_net: Add a query command for FAILOVER_STANDBY_CHANGED event.

---
Changes in v2:
  Added a query command for FAILOVER_STANDBY_CHANGED event.
  Added a query command for FAILOVER_PRIMARY_CHANGED event.

 hmp.c                          |   5 +++
 hw/acpi/pcihp.c                |  27 +++++++++++
 hw/net/virtio-net.c            |  42 +++++++++++++++++
 hw/pci/pci.c                   |   5 +++
 hw/vfio/pci.c                  |  60 +++++++++++++++++++++++++
 hw/vfio/pci.h                  |   1 +
 include/hw/pci/pci.h           |   1 +
 include/hw/virtio/virtio-net.h |   1 +
 include/net/net.h              |   2 +
 net/net.c                      |  59 ++++++++++++++++++++++++
 qapi/misc.json                 |   5 ++-
 qapi/net.json                  | 100 +++++++++++++++++++++++++++++++++++++++++
 12 files changed, 307 insertions(+), 1 deletion(-)

Patchew URL: https://patchew.org/QEMU/1546883690-17798-1-git-send-email-venu.busireddy@oracle.com/



Hi,

This series seems to have some coding style problems. See output below for
more information:

Subject: [Qemu-devel] [PATCH v2 0/5] Support for datapath switching during live migration
Message-id: 1546883690-17798-1-git-send-email-venu.busireddy@oracle.com
Type: series

=== TEST SCRIPT BEGIN ===
#!/bin/bash

BASE=base
n=1
total=$(git log --oneline $BASE.. | wc -l)
failed=0

git config --local diff.renamelimit 0
git config --local diff.renames True
git config --local diff.algorithm histogram

commits="$(git log --format=%H --reverse $BASE..)"
for c in $commits; do
    echo "Checking PATCH $n/$total: $(git log -n 1 --format=%s $c)..."
    if ! git show $c --format=email | ./scripts/checkpatch.pl --mailback -; then
        failed=1
        echo
    fi
    n=$((n+1))
done

exit $failed
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
Switched to a new branch 'test'
88b0acb pci: query command extension to check the bus master enabling status of the failover-primary device
ed2dc77 vfio-pci: Add FAILOVER_PRIMARY_CHANGED event to shorten downtime during failover
c677246 virtio_net: Add a query command for FAILOVER_STANDBY_CHANGED event.
135dfa7 virtio_net: Add support for "Data Path Switching" during Live Migration.
a87f451 virtio_net: Add VIRTIO_NET_F_STANDBY feature bit.

=== OUTPUT BEGIN ===
Checking PATCH 1/5: virtio_net: Add VIRTIO_NET_F_STANDBY feature bit....
Checking PATCH 2/5: virtio_net: Add support for "Data Path Switching" during Live Migration....
Checking PATCH 3/5: virtio_net: Add a query command for FAILOVER_STANDBY_CHANGED event....
WARNING: Block comments use a leading /* on a separate line
#121: FILE: net/net.c:1347:
+        /* only query information on queue 0 since the info is per nic,

ERROR: braces {} are necessary for all arms of this statement
#124: FILE: net/net.c:1350:
+        if (nc->queue_index != 0)
[...]

total: 1 errors, 1 warnings, 172 lines checked

Your patch has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

Checking PATCH 4/5: vfio-pci: Add FAILOVER_PRIMARY_CHANGED event to shorten downtime during failover...
Checking PATCH 5/5: pci: query command extension to check the bus master enabling status of the failover-primary device...
=== OUTPUT END ===

Test command exited with code: 1


The full log is available at
http://patchew.org/logs/1546883690-17798-1-git-send-email-venu.busireddy@oracle.com/testing.checkpatch/?type=message.
---
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