Difference between revisions of "Xen Project Release Features"

From Xen
m (Added initial release date for Xen 4.2.0)
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!style="width: 20%;"|Xen 4.0
!style="width: 20%;"|Xen 4.0
!style="width: 20%;"|Xen 4.1
!style="width: 20%;"|Xen 4.1
!style="width: 20%;"|Xen 4.2 (Testing)
!style="width: 20%;"|Xen 4.2
|Initial Release
|Initial Release
|7 April 2010
|7 April 2010
|25 March 2011
|25 March 2011
|17 September 2012
!colspan="4"|<big>Host Limits</big>
!colspan="4"|<big>Host Limits</big>

Revision as of 08:52, 17 September 2012

Xen 4.0 Xen 4.1 Xen 4.2
Initial Release 7 April 2010 25 March 2011 17 September 2012
Host Limits
Physical CPUs 128 [ 0 ] >255 4095
Physical RAM 1TB 5TB 5TB
Guest Types
Traditional Xen PV guest
HVM Guest [ 1 ]
Fully virtualised guest using hardware virtualisation extensions
PV-on_HVM Guest [ 1 ]
Fully virtualised guest using PV extensions/drivers for improved performance
PV Guest Limits
Virtual CPUs 128 >255 512
Virtual RAM 512GB 512GB 512GB
HVM Guest Limits
Virtual CPUs 128 128 256
Virtual RAM 1TB 1TB 1TB
xend / xm deprecated in this release
XL initial implementation preview release
Live Migration, Save & Restore
Memory ballooning
PCI Passthrough
TMEM -- Transcendent Memory [ 2 ] [ 2 ] [ 2 ]
debugger to debug ELF guests
Memory Sharing
allow sharing of identical pages between HVM guests
tech preview tech preview tech preview [ 3 ]
Memory Paging
allow pages belonging to HVM guests to be paged to disk
tech preview tech preview tech preview [ 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.
prototype prototype
1GB/2MB super page support
x86 Advanced Vector eXtension (AVX) [ 4 ] [ 4 ]
advanced partitioning
memaccess API
enabling integration of 3rd party security solutions into Xen virtualized environments
Deliver events to PVHVM guests using event channels
performance analysis
qemu based disk backend (qdisk) for XL
[ 5 ] [ 5 ]
mandatory access control policy providing fine-grained controls over Xen domains, similar to SELinux
Virtual Power Management Unit for HVM guests
Forward Machine Check Exceptions to Appropriate guests
? ?
Nested Virtualisation
Running a hypervisor inside an HVM guest
Device Models and Virtual Firmware for HVM guests
Traditional Device Model
Device emulator based on Xen fork of Qemu
Qemu Upstream Device Model
Device emulator based on upstream Qemu
BIOS used with traditional device model only
BIOS used with upstream qemu device model and XL only
UEFI Firmware used with upstream qemu device model and XL only
PV Bootloader support
PyGrub support for GRUB 2
PyGrub support for /boot on ext4
pvnetboot support
Bootloader supporting network boot of PV guests
Third Party
libvirt driver for XL

[ 0 ] Compile time limit, can be increased
[ 1 ] Requires hardware virtualisation support
[ 2 ] Ddisabled by default (enable with hypervisor command line option). Not supported in production and doesn't have full security support
[ 3 ] Preview, due to limited tools support. Hypervisor side in good shape
[ 4 ] Disabled by default (enable with hypervisor command line option)
[ 5 ] Used as a fallback if blkback and/or blktap2 are not available