Sometimes, some things are just too good to be true. Earlier this week, Microsoft made a relatively stunning announcement that it would contribute some 20000 lines of code to the Linux kernel, licensed under the GPL. Microsoft isn’t particularly fond of either Linux or the GPL, so this was pretty big news. As it turns out, the code drop was brought on by… A GPL violation.

This story begins when Stephen Hemminger, principal engineer with open-source network vendor Vyatta and Linux contributor, finds out that a network driver in Microsoft’s Hyper-V uses open source components licensed under the GPL. These components were statically linked to closed-source binaries, which the GPL does not allow.

Consequently, Hemminger contacted Linux Driver Project head Greg Kroah-Hartman, who works for Novell. Commendably, Hemminger wanted the case to be worked out without fireworks and massive media attention. “Since Novell has a (too) close association with Microsoft, my expectation was that Greg could prod the right people to get the issue resolved,” he writes on his blog.

When the code drop was announced Monday, nor Microsoft, nor Kroah-Hartman spoke of the violation. To confirm the story, About-Microsoft blogger Mary-Jo Foley contacted Kroah-Hartman, and he confirmed that Hemminger is indeed correct: the code drop seems to have been brought on by a GPL violation.

A “break from the ordinary” and a “significant milestone”? None of that – just a silently handled case, with an overdose of marketing spin, to prevent a major embarrassment for Microsoft.

I expect Microsoft to be evil and work to destroy the open source software movement.  This isn’t much of a surprise.  It is a bit of a disappointing end to this story though…

In an historic move, Microsoft Monday submitted driver source code for inclusion in the Linux kernel under a GPLv2 license.
The code consists of four drivers that are part of a technology called Linux Device Driver for Virtualization. The drivers, once added to the Linux kernel, will provide the hooks for any distribution of Linux to run on Windows Server 2008 and its Hyper-V hypervisor technology. Microsoft will provide ongoing maintenance of the code.

Linux backers hailed the submission as validation of the Linux development model and the Linux GPLv2 licensing.

Microsoft said the move will foster more open source on Windows and help the vendor offer a consistent set of virtualization, management and administrative tools to support mixed virtualized infrastructure.

“Obviously we are tickled about it,” said Jim Zemlin, executive director of the Linux Foundation. “Hell has frozen over, the seas have parted,” he said with a chuckle.

I am surprised by this move.  The Linux community would be well served to review this code very carefully.  Are their motives completely noble?

While observers hail Microsoft’s Linux kernel code submission as good for the industry and a substantial step forward, the move isn’t pure altruism.

The drivers will make it easier to support Linux guest operating systems in their emerging cloud infrastructure, and it will guarantee Windows is a part of every enterprise conversation around virtual Linux servers.

And virtualization integration baked into the Linux kernel appears to provide Microsoft with a heavy stick with which to beat up VMware.

“Why should Microsoft let a religious distaste for Linux get in the way of making a lot of money on Windows Server 2008 being the hypervisor under all those Linux servers?” asked Jeffrey Hammond, an analyst with Forrester Research. “Microsoft’s desire to take money away from VMware and other alternatives has outweighed its distaste for embracing Linux and the GPL. That is a sign of the opportunity they see here.”

Microsoft, however, won’t have an exclusive on virtualization drivers in Linux. VMware has certified kernel mode para-virtualization drivers but administrators have to install them separately because they are not part of the mainline Linux kernel.
“Microsoft is taking a short cut,” said Chris Wolf, an analyst with the Burton Group.”This is a big deal. When you get in the mainline Linux kernel it is a competitive advantage for Microsoft.”

I thought so…