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Xen EFI Support Being Added To Linux 3.17

Linux Kernel

Published on 04 August 2014 08:35 AM EDT
Written by Michael Larabel in Linux Kernel
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With the Linux 3.17 kernel that's now officially under development since yesterday's Linux 3.16 release is now support for Xen EFI.

With the upcoming Linux 3.17, it's possible to boot using (U)EFI under Xen Dom0. Daniel Kiper who worked on the Xen EFI patches explained, "Standard EFI Linux Kernel infrastructure cannot be used because it requires direct access to EFI data and code. However, in dom0 case it is not possible because above mentioned EFI stuff is fully owned and controlled by Xen hypervisor. In this case all calls from dom0 to EFI must be requested via special hypercall which in turn executes relevant EFI code in behalf of dom0."

Other EFI changes queued up for the Linux 3.17 merge window are outlined in this EFI pull request but the Xen EFI Dom0 support seems to be the main user-facing feature this cycle. After being introduced in Linux 3.16, there's also continued work on 64-bit ARM EFI support for 3.17.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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