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+# How to test vhost-user-blk with SPDK
+
+The purpose of this document is to illustrate how to test vhost-user-blk in Cloud Hypervisor with SPDK as the backend.
+
+## Framework
+
+It's a simple test to validate the block read/write between VM and block backend.
+```
+             +----+----------+          +-------------+-----------+
+             |    |          |          |             |           |
+             |    |vhost-user|----------| vhost-user  |    dpdk   |
+             |    |blk device|          | port 1      |           |
+             |    |          |          |             |           |
+             |    +----------+          +-------------+-----------+
+             |               |          |                         |
+             |      vm       |          |           spdk          |
+             |               |          |                         |
+          +--+----------------------------------------------------+--+
+          |  |                  hugepages                         |  |
+          |  +----------------------------------------------------+  |
+          |                                                          |
+          |                       host                               |
+          |                                                          |
+          +----------------------------------------------------------+
+```
+## Prerequisites
+
+Prior to running the test, the following steps need to be performed.
+- Enable hugepages
+- Install SPDK
+
+Here are some good references for detailing them.
+- spdk
+	* https://spdk.io/doc/
+
+## Test environment
+
+The below test environment is based on ubuntu release(16.04.1 LTS), as for other system, please check related document.
+The test runs with multiple queue (MQ) support enabled, using 4 queues defined for both SPDK and the virtual machine.
+Here are the details on how the test can be run.
+
+### The hugepages settings in host linux
+Add "default_hugepagesz=1G hugepagesz=1G hugepages=2" into host linux cmdline.
+As for how to change Ubuntu linux cmdline in grub file, please ref below link:
+https://www.ostechnix.com/configure-grub-2-boot-loader-settings-ubuntu-16-04/
+reboot Ubuntu
+sudo mount -t hugetlbfs -o pagesize=1G none /dev/hugepages
+
+### Download the SPDK code
+git clone https://github.com/spdk/spdk
+cd spdk
+git submodule update --init
+
+### Create the build dep
+./scripts/pkgdep.sh
+
+### Build spdk
+./configure
+make
+
+### Set the SPDk environment
+sudo HUGEMEM=2048 scripts/setup.sh
+sudo ./app/vhost/vhost -S /var/tmp -s 1024 -m 0x3 &
+
+### Create 512M block device
+sudo scripts/rpc.py bdev_malloc_create 512 512 -b Malloc0
+sudo scripts/rpc.py vhost_create_blk_controller --cpumask 0x1 vhost.1 Malloc0
+
+_Launch the VM_
+
+VMs run in client mode. They connect to the socket created by the `dpdkvhostuser` in the SPDK backend.
+```bash
+# From the test terminal. We need to create one vhost-user-blk device for the --disk.
+./cloud-hypervisor \
+        --cpus boot=4 \
+        --memory size=1024M,file=/dev/hugepages \
+        --kernel linux/arch/x86/boot/compressed/vmlinux.bin \
+        --cmdline "console=ttyS0 reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda3 iommu=off" \
+        --disk "path=images/clear-kvm.img" "num_queues=4,queue_size=128,vhost_user=true,socket=/var/tmp/vhost.1,wce=true" \
+        --console off \
+        --serial tty \
+        --rng
+```
+
+```bash
+# How to test the vhost-user-blk device with SPDK backend
+login in guest
+
+# Use lsblk command to find out vhost-user-blk device
+lsblk
+NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
+vda    253:0    0  8.5G  0 disk
+├─vda1 253:1    0  511M  0 part
+├─vda2 253:2    0   32M  0 part [SWAP]
+└─vda3 253:3    0    8G  0 part /
+vdb    253:16   0  512M  0 disk
+
+The vhost-user-blk device is /dev/vdb
+
+# How to do simple read/write test
+dd if=/dev/vdb of=/dev/null bs=2M iflag=direct
+dd of=/dev/vdb if=/dev/zero bs=2M oflag=direct count=256
+
+If you want to do fio test, please install fio binary into guest. The detailed info is not listed here.