Xen Project Release Features: Difference between revisions

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|[[Xen_Roadmap/4.3|TBD]]
|[[Xen_Roadmap/4.3|TBD]]
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!colspan="4"|<big>Host Limits</big>
!colspan="5"|<big>Host Limits</big>
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|Physical CPUs
|Physical CPUs
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|16TB
|16TB
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!colspan="4"|<big>[[Xen Overview#Guest_Types|Guest Types]]</big>
!colspan="5"|<big>[[Xen Overview#Guest_Types|Guest Types]]</big>
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|Paravirtualised<br/><small>Traditional Xen ''PV'' guest</small>
|Paravirtualised<br/><small>Traditional Xen ''PV'' guest</small>
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|{{Tick}}
|{{Tick}}
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!colspan="4"|<big>PV Guest Limits</big>
!colspan="5"|<big>PV Guest Limits</big>
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|Virtual CPUs
|Virtual CPUs
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|512GB
|512GB
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!colspan="4"|<big>HVM Guest Limits</big>
!colspan="5"|<big>HVM Guest Limits</big>
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|Virtual CPUs
|Virtual CPUs
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|1TB
|1TB
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!colspan="4"|<big>Toolstack</big>
!colspan="5"|<big>Toolstack</big>
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|xend / xm
|xend / xm
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|{{Tick}}
|{{Tick}}
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!colspan="4"|<big>Features</big>
!colspan="5"|<big>Features</big>
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|Live Migration, Save & Restore
|Live Migration, Save & Restore

Revision as of 13:41, 29 April 2013

Legend: ✓: Feature ✓: Partial

Xen 4.0 Xen 4.1 Xen 4.2 Xen 4.3
Initial Release 7 April 2010 25 March 2011 17 September 2012 TBD
Host Limits
Physical CPUs 128 [ 0 ] >255 4095 4095
Physical RAM 1TB 5TB 5TB 16TB
Guest Types
Paravirtualised
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 >255 512 512
Virtual RAM 512GB 512GB 512GB 512GB
HVM Guest Limits
Virtual CPUs 128 128 256 256
Virtual RAM 1TB 1TB 1TB 1TB
Toolstack
xend / xm ✓ ✓ ✓deprecated in this release
XL ✓initial implementation ✓preview release ✓
Features
Live Migration, Save & Restore ✓ ✓ ✓
Memory ballooning ✓ ✓ ✓
Blktap2 ✓ ✓ ✓
PCI Passthrough ✓ ✓ ✓
TMEM -- Transcendent Memory ✓ [ 2 ] ✓ [ 2 ] ✓ [ 2 ]
gdbsx
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 ]
cpupool
advanced partitioning 		✓ ✓
memaccess API
enabling integration of 3rd party security solutions into Xen virtualized environments 		✓ ✓
Deliver events to PVHVM guests using Xen event channels ✓ ✓
HVM PXE Stack gPXE iPXE iPXE
xentrace
performance analysis 		✓ ✓ ✓
qemu based disk backend (qdisk) for XL
 ✓ [ 5 ] ✓ [ 5 ]
FLASK
mandatory access control policy providing fine-grained controls over Xen domains, similar to SELinux 		✓ ✓ ✓
vPMU
Virtual Power Management Unit for HVM guests 		✓ ✓ ✓
vMCE
Forward Machine Check Exceptions to Appropriate guests 		? ? ✓
Nested Virtualisation
Running a hypervisor inside an HVM guest 		✓experimental
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 		✓tech preview
ROMBIOS
BIOS used with traditional device model only 		✓ ✓ ✓
SeaBIOS
BIOS used with upstream qemu device model and XL only 		✓
OVMF/Tianocore
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

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