Last July, Microsoft announced the drivers for Linux source code is available in the Hyper-V virtualization environment. In practice, the 2.6.32 of the Linux kernel version now contains drivers for synthetic Hyper-V, virtual machine including the VMBus, storage, and network components. In detail, it’s hv_vmbus, hv_storvsc, hv_blkvsc and hv_netvsc modules. These modules are described in this article.

Out configurations “officially supported”, I tested the activation of these modules in new Ubuntu Server 10.04, provided recently with the 2.6.32 kernel. To do this I found this article which explains how to enable these modules, and which I inspire me thus far.

Enabling modules

Firstly it must ensure that the Hyper-V modules are loaded at startup. To do this, edit the file /etc/initramfs-tools/modules and add the following four lines:

hv_vmbus

hv_storvsc

hv_blkvsc

hv_netvsc

Then, update the initramfs image:

$ sudo update-initramfs - u

Finally, configure the network by changing the/etc/network/interfaces file to configure the network interface named seth0. Indeed, a synthetic NIC would be named seth n instead of eth n for “legacy” network adapter.

For example for a DHCP configuration, add the following to /etc/network/interfaces:

Auto eth0

iface eth0 inet dhcp

or, for a static IP address:

Auto eth0

iface eth0 inet static

address ip_address

netmask mask

Gateway address

It remains only to restart, and check the proper loading of drivers using the command:

$ lsmod

grep hv_ (lower case L) in lsmod

Test procedure

For my test I used Windows Server 2008 R2 Hyper-V, and 32-bit Ubuntu Server 10.04 (ubuntu-10. 04 - server - i386 .iso).

Because I set up the VM with a synthetic network adapter, it is not detected the installation. This is not serious; it will be when it has made steps outlined previously after installation.

On this error message, choose .

Once the virtual machine installed and started, the steps outlined above are fairly simple to implement:

After a reboot (sudo reboot), we have many assets on the network map seth0 synthetic, and other drivers loaded:

That is what servers run Linux under Hyper-V with decent performance. Have to wait for integration into the Linux kernel the next features (multi-processors, clock synchronization and stop integrated), these features are currently available in the beta integration services 2.1, SUSE Linux Enterprise Server Red Hat Enterprise Linux.