Xen Project Release Features: Difference between revisions

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(Restructured table to mor eclearly cover for the X86 / ARM split)
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!colspan="5"|<big>Host Limits</big>
!colspan="5"|<big>Host Limits</big>
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!colspan="5" style="background-color: #A9BCF5;"|For X86 Architectures
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|Physical CPUs
|Physical CPUs
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|16TB
|16TB
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!colspan="5" style="background-color: #A9BCF5;"|For ARM Architectures
⚫
!colspan="5"|<big>X86 PV Guest Limits</big>
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|Physical CPUs
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|TBA
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|Physical RAM
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|TBA
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⚫
!colspan="5"|<big>Guest Limits</big>
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!colspan="5" style="background-color: #A9BCF5;"|X86 PV Guest Limits
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|Virtual CPUs
|Virtual CPUs
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|512GB
|512GB
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!colspan="5"|<big>X86 HVM Guest Limits</big>
!colspan="5" style="background-color: #A9BCF5;"|X86 HVM Guest Limits
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|Virtual CPUs
|Virtual CPUs
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|1TB
|1TB
|1TB
|1TB
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!colspan="5" style="background-color: #A9BCF5;"|ARM Guest Limits
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|Virtual CPUs
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|TBA
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|Virtual RAM
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|TBA
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!colspan="5"|<big>Toolstack</big>
!colspan="5"|<big>Toolstack</big>

Revision as of 15:22, 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
Supported Mainline Architectures
IA-A32 ✓ ✓ ✓ ✓
X86-64 ✓ ✓ ✓ ✓
Itanium ✓ ✓deprecated in this release ✓deprecated
ARM v7 + Virtualization Extensions ✓tech preview [ 6 ]
ARM v8 ✓tech preview [ 6 ]
Guest Types
For X86 Architectures
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 		✓ ✓ ✓ ✓
For ARM Architectures
ARM Guest
Optimal combination of full virtualization and PV extensions 		✓tech preview [ 6 ]
Host Limits
For X86 Architectures
Physical CPUs 128 [ 0 ] >255 4095 4095
Physical RAM 1TB 5TB 5TB 16TB
For ARM Architectures
Physical CPUs TBA
Physical RAM TBA
Guest Limits
X86 PV Guest Limits
Virtual CPUs 128 >255 512 512
Virtual RAM 512GB 512GB 512GB 512GB
X86 HVM Guest Limits
Virtual CPUs 128 128 256 256
Virtual RAM 1TB 1TB 1TB 1TB
ARM Guest Limits
Virtual CPUs TBA
Virtual RAM TBA
Toolstack
xend / xm ✓ ✓ ✓deprecated in this release ✓deprecated
XL ✓initial implementation ✓preview release ✓ ✓
XL openvswitch toostack integration ✓tech preview [ 7 ]
XL Spice support ✓tech preview [ 7 ]
Features
Live Migration, Save & Restore ✓ ✓ ✓ ✓
Memory ballooning ✓ ✓ ✓ ✓
Blktap2 ✓ ✓ ✓ ✓
PCI Passthrough ✓ ✓ ✓ ✓
TMEM -- Transcendent Memory ✓ [ 2 ] ✓ [ 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 ] ✓tech preview [ 3 ]
Memory Paging
allow pages belonging to HVM guests to be paged to disk 		✓tech preview ✓tech preview ✓tech preview [ 3 ] ✓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 ✓experimental
1GB/2MB super page support ✓ ✓ ✓
x86 Advanced Vector eXtension (AVX) ✓ [ 4 ] ✓ [ 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 iPXE
xentrace
performance analysis 		✓ ✓ ✓ ✓
qemu based disk backend (qdisk) for XL
 ✓ [ 5 ] ✓ [ 5 ] ✓ [ 5 ]
FLASK
mandatory access control policy providing fine-grained controls over Xen domains, similar to SELinux 		✓ ✓ ✓ ✓
Support for IS_PRIV checks
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 ✓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 ✓default, unless stubdomains are used
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
[ 6 ] See Xen ARM with Virtualization Extensions; basic functionality implemented; lack of real hardware to validate against
[ 7 ] tech preview, depending on test coverage in Xen Test Days

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