The second Linux kernel release of 2007 is now available, further extending the virtualization and real-time capabilities of Linux.

Highlighting the Linux 2.6.21 update is the inclusion of the paravirt-ops paravirtualization interface, which enables multiple hypervisors to hook directly into Linux.

VMware, XenSource, IBM and Red Hat first launched the effort to provide expansive virtualization in paravirt-ops in August to make it easier for all virtualization vendors to work in Linux. VMware's VMI (virtual machine interface) is also included in 2.6.21 taking advantage of paravirt-ops.

"It is absolutely a milestone for us," Jack Lo, senior director of R&D at VMware, told internetnews.com.

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Also: Stable kernels 2.6.20.10, 2.6.21.1 released