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You can find the hypervisor version in "xen_major", "xen_minor" and "xen_extra" fields. Determining the version from within a dom U is dependent on the guest operating system.
For Linux guests: Xen requires CPU virtualization support/extensions (Intel VT, AMD-V) for running HVM guests (=Windows).
PCI passthru to Xen HVM guests requires hardware IOMMU.
Remember there's usually a separate configuration option for IOMMU IO Virtualization (VT-d) in the BIOS, so you need to enable IOMMU from the system BIOS before booting to Xen. For more information see: See Xen FAQ Compatibility Yes, please see the Xen Hypervisor Boot Options wiki page.
Citrix Xen Server is a commercial product that includes the core Xen Project Hypervisor from Xen Project.org, combined with Cent OS-based dom0 distro, management toolstack, and everything else required to build a ready made virtualization platform. Citrix Xen Server is a dedicated virtualization platform (not a general purpose Linux distro), and it is shipped as a ready to install ISO-image that contains everything you need out-of-the-box.
Citrix Xen Server includes the XAPI management toolstack, allowing you to pool multiple Xen hosts together and manage them centrally using either the graphical Citrix Xen Center management tool, the 'xe' commandline tool or using the Xen API directly from your scripts.
Citrix Xen Center graphical management tool is only available for Windows.
Yes, you can browse the source tree and see the changelogs/summaries and track changes online from the Xen Project Repositories wiki page.
See Pv Grub wiki page for more information and usage of pvgrub.
Also Xen hypervisor boot messages in "xl dmesg" show if hardware virtualization (HVM) is enabled or disabled.
Example "xl dmesg | grep -i hvm" output for an Intel system where HVM is supported by the CPU: Hardware IOMMU (Intel VT-d) is required for hardware assisted PCI passthru (I/O virtualization) to Xen HVM (fully virtualized) guest VMs.
Yes, please see the Research Papers Directory The Xen Project Hypervisor from Xen is the core hypervisor used in many different products. It is distributed as a tarball and from mercurial source code repositories.
You need to compile and install Xen hypervisor from sources, and combine it with a kernel of your choice.
Please see this blog post for more information: Also check these documents: See the Xen Project Best Practices wiki page.