On 7/7/2023 2:08 PM, Lingyu Liu wrote:
Add iavf live migration steps based on KVM VFIO migration.
Signed-off-by: Lingyu Liu <lingyu....@intel.com>
---
v2: Fixed CI.
Added brief introduction about live migration.
Clarified this is iavf feature.
v3: Added intro and link about vfio live migration.
Added description about kernel boot parameters.
Changed to use sysfs to bind device to driver.
Noted for running dpdk-testpmd.
Highlighted KVM vfio migration.
v4: Removed ice kernel driver version.
---
doc/guides/nics/intel_vf.rst | 113 +++++++++++++++++++++++++
doc/guides/rel_notes/release_23_07.rst | 3 +
2 files changed, 116 insertions(+)
diff --git a/doc/guides/nics/intel_vf.rst b/doc/guides/nics/intel_vf.rst
index d365dbc185..85b3b4fc24 100644
--- a/doc/guides/nics/intel_vf.rst
+++ b/doc/guides/nics/intel_vf.rst
@@ -622,6 +622,119 @@ which belongs to the destination VF on the VM.
Inter-VM Communication
+Live Migrating a VM running DPDK
+--------------------------------
+
+Live migration refers to the process of moving a running virtual machine (VM)
or application
+between different physical machines without disconnecting the client or
application
+(see https://en.wikipedia.org/wiki/Live_migration for more information).
+
+VFIO device migration refers to migrating a VM which have VFIO device
pass-through
+(see https://qemu.readthedocs.io/en/latest/devel/vfio-migration.html for more
information).
+
+This part describes stpes to migrate a VM which has a iavf device pass through.
+
+The following describes a target environment:
+
+* Host Operating System: Ubuntu 20.04.5
+
+* Guest Operating System: Ubuntu 20.04.5
+
+* Linux Kernel Version: 5.15.0-72-generic
+
+* Target Applications: dpdk-testpmd
+
+* Ice Kernel Driver: Download from
`<https://www.intel.com/content/www/us/en/download/19630>`_
+
+* Qemu Version: 7.2
+
+The setup procedure is as follows:
+
+#. Before booting the Host OS, open **BIOS setup** and enable **Intel® VT
features**.
+
+#. While booting the Host OS kernel, pass the intel_iommu=on kernel command
line argument using GRUB.
+
+#. In the Host OS
+
+ Install the ice driver and migration driver:
+
+ .. code-block:: console
+
+ insmod ice.ko
+ insmod ice-vfio-pci.ko
+
+ Create 2 VFs and bind them to vfio pci driver:
+
+ .. code-block:: console
+
+ echo 2 > /sys/bus/pci/devices/0000:ca:00.1/sriov_numvfs
+ echo "8086 1889" > /sys/bus/pci/drivers/ice-vfio-pci/new_id
+ echo 0000:ca:11.0 > /sys/bus/pci/devices/0000:ca:11.0/driver/unbind
+ echo 0000:ca:11.0 > /sys/bus/pci/drivers/ice-vfio-pci/bind
+ echo 0000:ca:11.1 > /sys/bus/pci/devices/0000:ca:11.1/driver/unbind
+ echo 0000:ca:11.1 > /sys/bus/pci/drivers/ice-vfio-pci/bind
+
+ .. note::
+
+ The command above creates two vfs for device 0000:ca:00.1:
+
+ .. code-block:: console
+
+ 0000:ca:11.0 'Ethernet Adaptive Virtual Function 1889' if=
drv=ice-vfio-pci unused=iavf
+ 0000:ca:11.1 'Ethernet Adaptive Virtual Function 1889' if=
drv=ice-vfio-pci unused=iavf
+
+#. Now, start the migration source Virtual Machine by running the following
command:
+
+ .. code-block:: console
+
+ qemu/build/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -cpu host -m
4G -smp 1 -device
vfio-pci,host=0000:ca:11.0,x-enable-migration=true,x-pre-copy-dirty-page-tracking=off
-drive file=ubuntu-2004.qcow2 -nic user,hostfwd=tcp::5555-:22 -monitor stdio
+
+ .. note::
+ The vfio-pci,host=0000:ca:11.0 value indicates that you want to attach
a vfio PCI device
+ to a Virtual Machine and the respective (Bus:Device.Function) numbers
should be passed,
+ x-enable-migration=true indicates that this VF supports migration.
Dirty page tracking
+ is not supported, so set x-pre-copy-dirty-page-tracking=off.
+
+#. In VM, install iavf driver and vfio-pci driver
+
+ .. code-block:: console
+
+ insmod iavf.ko
+ modprobe vfio enable_unsafe_noiommu_mode=1
+ moodprobe vfio-pci
+
+#. Bind net device to vfio-pci driver and launch dpdk-testpmd
+
+ .. code-block:: console
+
+ dpdk-testpmd -l 0-1 -- -i
+ testpmd> set txpkts 64
+ testpmd> start tx_first
+
+ .. note::
+ Please ensure dpdk-testpmd to run independently of ssh console.
+ Suggest to put it in a background process like tmux/screen so that
+ migration will not causing ssh console exit and dpdk-testpmd killed.
+
+#. Start the migration destination Virtual Machine
+
+ .. code-block:: console
+
+ qemu/build/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -cpu host -m
4G -smp 1 -device
vfio-pci,host=0000:ca:11.1,x-enable-migration=true,x-pre-copy-dirty-page-tracking=off
-drive file=ubuntu-2004.qcow2 -nic user,hostfwd=tcp::5556-:22 -monitor stdio
-incoming tcp:127.0.0.1:4444
+
+ #. Start migration by issuing the command in qemu console
+
+ .. code-block:: console
+
+ migrate -d tcp:127.0.0.1:4444
+
+#. Log in the destination VM, and dpdk-testpmd is not interrupt
+
+.. note::
+
+ Host kernel version above 5.17 is currently not supported due to kAPI
change.
+
+
Windows Support
---------------
diff --git a/doc/guides/rel_notes/release_23_07.rst b/doc/guides/rel_notes/release_23_07.rst
index 4459144140..794a86eba3 100644
--- a/doc/guides/rel_notes/release_23_07.rst
+++ b/doc/guides/rel_notes/release_23_07.rst
@@ -200,6 +200,9 @@ New Features
Enhanced the GRO library to support TCP packets over IPv6 network.
+* **Updated Intel iavf driver.**
+
+ Added the document for iavf driver live migration based on KVM vfio
migration.
Removed Items
-------------
Reviewed-by: Yahui Cao <yahui....@intel.com>
