p/fuel: virtio: min libvirt 3.x and Qemu 2.6

Expect host virtualization tools (libvirt, qemu) to be recent enough
to support modern virtio-net-pci out of box as a default.

This allows us to drop some changes and a hack - see [1]:
- "model=virtio" implies "model=virtio-net-pci" on libvirt 3.x;
- "model=virtio" puts each NIC on a seperate bus, all work now;
- modern virtio is automatically used when NIC is on PCIe bus;

Revert "p/fuel: lib.sh: Revert to virtio-mmio for PXE net"

This reverts commit 4f72e6be436badd2ded546424ec4a304cd6ce5d3.

[1] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg07594.html

Change-Id: Iaa7af63846c9d9dca5b7a9be5efa54f8cd56242e
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/patches/opnfv-fuel/0003-lib.sh-Use-host-passthrough-when-spawning-VMs.patch b/patches/opnfv-fuel/0003-lib.sh-Use-host-passthrough-when-spawning-VMs.patch
new file mode 100644
index 00000000..57e45d6f
--- /dev/null
+++ b/patches/opnfv-fuel/0003-lib.sh-Use-host-passthrough-when-spawning-VMs.patch
@@ -0,0 +1,29 @@
+From: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
+Date: Fri, 21 Jul 2017 19:59:33 +0200
+Subject: [PATCH] lib.sh: Use host-passthrough when spawning VMs
+
+virsh defaults to using "host-model" instead of "host-passthrough",
+which not only might lead to a small performance hit on x86, it is
+also causing compatibility issues with libvirt 3.x.
+
+Address this by explicitly requesting "host-passthrough" as the
+CPU model for virt-install.
+
+Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
+---
+ mcp/scripts/lib.sh | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/mcp/scripts/lib.sh b/mcp/scripts/lib.sh
+index 862fdcc..251c5a5 100644
+--- a/mcp/scripts/lib.sh
++++ b/mcp/scripts/lib.sh
+@@ -65,7 +65,7 @@ create_vms() {
+
+   # create vms with specified options
+   for node in "${vnodes[@]}"; do
+-    virt-install --name ${node} --ram ${vnodes_ram[$node]} --vcpus ${vnodes_vcpus[$node]} --cpu host --accelerate \
++    virt-install --name ${node} --ram ${vnodes_ram[$node]} --vcpus ${vnodes_vcpus[$node]} --cpu host-passthrough --accelerate \
+     --network network:pxe,model=virtio \
+     --network network:mgmt,model=virtio \
+     --network network:internal,model=virtio \