VirtualBox 4.1 Beta 2 gains PCI passthrough support

"VirtualBox 4.1 Beta 2 sees the addition of experimental PCI passthrough support for Linux hosts, which allows the Guest OS (VirtualMachine) to 'passthrough' the hypervisor and directly access physical hardware, such as a PCI ethernet card, improving overall performance. Other changes include showing the CPU cap in the VM details page, better out-of-memory error reporting, updates to the Linux and Windows installers, and fixes for USB 2.0 support for non-official builds, as well as a fix for a regression which prevented certain guests from booting. A possible data corruption related to Virtual Hard Disk (VHD) and Parallels images has also been corrected."

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