Xen Project Release Features
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| Xen 4.0 | Xen 4.1 | |
|---|---|---|
| Initial Release | 7 April 2010 | 25 March 2011 |
| Host Limits | ||
| Physical CPUs | 128 [ 1 ] | >255 |
| RAM | 1TB | 5TB |
| Guest Types | ||
| Paravirtualised Traditional Xen PV guest |
✓ | ✓ |
| HVM Guest [ 0 ] Fully virtualised guest using hardware virtualisation extensions |
✓ | ✓ |
| PV-on_HVM Guest [ 0 ] Fully virtualised guest using PV extensions for improved performance |
✓ | ✓ |
| PV Guest Limits | ||
| Virtual CPUs | 128 | >255 |
| RAM | 512GB | |
| HVM Guest Limits | ||
| Virtual CPUs | 128 | 128 |
| RAM | 1TB | |
| Toolstack | ||
| xend / xm | ✓ | ✓ |
| XL | Initial implementation | Preview release |
| Features | ||
| Live Migration, Save & Restore | ✓ | ✓ |
| Memory ballooning | ✓ | ✓ |
| Blktap2 | ✓ | ✓ |
| PCI Passthrough | ✓ | ✓ |
| TMEM -- Transcendent Memory | ✓ [ 2 ] | ✓ [ 2 ] |
| gdbsx debugger to debug ELF guests |
✓ | ✓ |
| Memory Sharing | ✓ [ 3 ] | ✓ [ 3 ] |
| Online resize of virtual disks | ✓ | ✓ |
| Remus Fault Tolerance | ✓ | ✓ |
| Physical CPU Hotplug | ✓ | ✓ |
| Physical Memory Hotplug | ✓ | ✓ |
| Support for PV kernels in bzImage format | ✓ | ✓ |
| Credit 2 Scheduler designed for latency-sensitive workloads and very large systems. |
✓ [ 4 ] | |
| 1GB/2MB super page support | ✓ | |
| x86 Advanced Vector eXtension (AVX) | ✓ | |
| cpupool advanced partitioning |
✓ | |
| memaccess API enabling integration of 3rd party security solutions into Xen virtualized environments |
✓ | |
| Deliver events to PVHVM guests using event channels | ✓ | |
| HVM PXE Stack | gPXE | iPXE |
| xentrace performance analysis |
✓ | ✓ |
| qemu based disk backend (qdisk) for XL |
✓ [ 5 ] | |
| FLASK mandatory access control policy providing fine-grained controls over Xen domains, similar to SELinux |
✓ | ✓ |
| PyGrub | ||
| Support for GRUB 2 | ✓ | ✓ |
| Support for /boot on ext4 | ✓ | ✓ |
| Third Party | ||
| libvirt driver for XL | ✓ | |
[ 0 ] Required hardware virtualisation support
[ 1 ] Compile time limit, can be increased
[ 2 ] Disabled as a default (enable with hypervisor command line option)
[ 3 ] Initial implementation (tech preview)
[ 4 ] Prototype
[ 5 ] Used as a fallback if blkback and/or blktap2 are not available
