Difference between revisions of "Xen Project Release Features"

From Xen
(Added new column)
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{|class="prettytable" style="text-align: left;" valign="top"
  
{|class="prettytable" style="text-align: left;" valign="top"
 
!style="width: 40%;"|
  
!style="width: 40%;"|
−
!style="width: 12%;"|Xen 4.0
 +
!style="width: 10%;"|Xen 4.0
−
!style="width: 12%;"|Xen 4.1
 +
!style="width: 10%;"|Xen 4.1
−
!style="width: 12%;"|Xen 4.2
 +
!style="width: 10%;"|Xen 4.2
−
!style="width: 12%;"|Xen 4.3
 +
!style="width: 10%;"|Xen 4.3
−
!style="width: 12%;"|Xen 4.4
 +
!style="width: 10%;"|Xen 4.4
  +
!style="width: 10%;"|Xen 4.5
 
|-
  
|-
 
|Initial Release
  
|Initial Release
 
|7 April 2010
  
|7 April 2010
 
|25 March 2011
  
|25 March 2011
−
|17 September 2012
 +
|17 Sept 2012
 
|9 July 2013
  
|9 July 2013
 
|10 March 2014
  
|10 March 2014
  +
|TBD
 
|-
  
|-
 
|Feature List
  
|Feature List
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|[[Xen 4.3 Feature List|FL 4.3]]
  
|[[Xen 4.3 Feature List|FL 4.3]]
 
|[[Xen 4.4 Feature List|FL 4.4]]
  
|[[Xen 4.4 Feature List|FL 4.4]]
  +
|[[Xen_Project_4.5_Feature_List|FL 4.5]]
 
|-
  
|-
 
|Release Notes
  
|Release Notes
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|[[Xen 4.3 Release Notes|RN 4.3]]
  
|[[Xen 4.3 Release Notes|RN 4.3]]
 
|[[Xen 4.4 Release Notes|RN 4.4]]
  
|[[Xen 4.4 Release Notes|RN 4.4]]
  +
|[[Xen 4.4 Release Notes|RN 4.5]]
 
|-
  
|-
−
!colspan="6"|<big>Supported Mainline Architectures for the hypervisor (Host)</big>
 +
!colspan="7"|<big>Supported Mainline Architectures for the hypervisor (Host)</big>
 
|-
  
|-
 
|[http://en.wikipedia.org/wiki/IA-32 IA-A32]
  
|[http://en.wikipedia.org/wiki/IA-32 IA-A32]
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|{{Tick}}
  
|{{Tick}}
 
|{{Tick}}
  
|{{Tick}}
  +
|{{NotDone}}<small>removed</small>
−
|Removed
  
 
|
  
|
 
|-
  
|-
 
|[http://en.wikipedia.org/wiki/X86-64 X86-64]
  
|[http://en.wikipedia.org/wiki/X86-64 X86-64]
  +
|{{Tick}}
 
|{{Tick}}
  
|{{Tick}}
 
|{{Tick}}
  
|{{Tick}}
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|{{Tick}}<small>deprecated in this release</small>
  
|{{Tick}}<small>deprecated in this release</small>
 
|{{Tick}}<small>deprecated</small>
  
|{{Tick}}<small>deprecated</small>
  +
|{{NotDone}}<small>removed</small>
−
|Removed
  
 
|
  
|
 
|-
  
|-
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|
  
|
 
|
  
|
−
|{{HalfDone}}<small>tech preview</small> <sup>[ [[#Foot6|6]] ]</sup>
 +
|{{HalfDone}}<small>preview</small> <sup>[ [[#Foot6|6]] ]</sup>
 
|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
Line 64: Line 69:
 
|
  
|
 
|
  
|
−
|{{HalfDone}}<small>tech preview</small> <sup>[ [[#Foot6|6]] ]</sup>
 +
|{{HalfDone}}<small>preview</small> <sup>[ [[#Foot6|6]] ]</sup>
 
|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6"|<big>[[Xen Overview#Guest_Types|Guest Types]]</big>
 +
!colspan="7"|<big>[[Xen Overview#Guest_Types|Guest Types]]</big>
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|For X86 Architectures
+
!colspan="7" style="background-color: #A9BCF5;"|For X86 Architectures
 
|-
  
|-
 
|Paravirtualised<br/><small>Traditional Xen Project ''PV'' guest</small>
  
|Paravirtualised<br/><small>Traditional Xen Project ''PV'' guest</small>
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|
  
|
 
|
  
|
−
|{{Tick}}<small>tech preview</small>
 +
|{{Tick}}<small>preview</small>
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|For ARM Architectures
+
!colspan="7" style="background-color: #A9BCF5;"|For ARM Architectures
 
|-
  
|-
 
|ARM Guest<sup><br/><small>Optimal combination of full virtualization and PV extensions</small>
  
|ARM Guest<sup><br/><small>Optimal combination of full virtualization and PV extensions</small>
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|
  
|
 
|
  
|
−
|{{HalfDone}}<small>tech preview</small> <sup>[ [[#Foot6|6]] ]</sup>
 +
|{{HalfDone}}<small>preview</small> <sup>[ [[#Foot6|6]] ]</sup>
 
|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6"|<big>Host Limits</big>
 +
!colspan="7"|<big>Host Limits</big>
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|For X86 Architectures
+
!colspan="7" style="background-color: #A9BCF5;"|For X86 Architectures
 
|-
  
|-
 
|Physical CPUs
  
|Physical CPUs
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|16TB
  
|16TB
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|For ARM Architectures
+
!colspan="7" style="background-color: #A9BCF5;"|For ARM Architectures
 
|-
  
|-
 
|Physical CPUs
  
|Physical CPUs
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|16GB
  
|16GB
 
|-
  
|-
−
!colspan="6"|<big>Guest Limits</big>
 +
!colspan="7"|<big>Guest Limits</big>
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|X86 PV Guest Limits
+
!colspan="7" style="background-color: #A9BCF5;"|X86 PV Guest Limits
 
|-
  
|-
 
|Virtual CPUs
  
|Virtual CPUs
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|512GB
  
|512GB
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|X86 HVM Guest Limits
+
!colspan="7" style="background-color: #A9BCF5;"|X86 HVM Guest Limits
 
|-
  
|-
 
|Virtual CPUs
  
|Virtual CPUs
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|1TB
  
|1TB
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|ARM Guest Limits
+
!colspan="7" style="background-color: #A9BCF5;"|ARM Guest Limits
 
|-
  
|-
 
|Virtual CPUs
  
|Virtual CPUs
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|16GB
  
|16GB
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|Number of event channels
+
!colspan="7" style="background-color: #A9BCF5;"|Number of event channels
 
|-
  
|-
 
|Event Channels
  
|Event Channels
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|131072
  
|131072
 
|-
  
|-
−
!colspan="6"|<big>Toolstack</big>
 +
!colspan="7"|<big>Toolstack</big>
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|Built-in
+
!colspan="7" style="background-color: #A9BCF5;"|Built-in
 
|-
  
|-
 
|xend / xm
  
|xend / xm
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|{{Tick}}<small>deprecated in this release</small>
  
|{{Tick}}<small>deprecated in this release</small>
 
|{{Tick}}<small>deprecated</small>
  
|{{Tick}}<small>deprecated</small>
−
|{{Tick}}<small>depricated</small>
 +
|{{Tick}}<small>deprecated</small>
  +
|{{NotDone}}<small>removed</small>
  +
 
|-
  
|-
 
|[[XL]]
  
|[[XL]]
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|
  
|
 
|
  
|
−
|{{Tick}}<small>tech preview</small> <sup>[ [[#Foot7|7]] ]</sup>
 +
|{{Tick}}<small>preview</small> <sup>[ [[#Foot7|7]] ]</sup>
 
|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|3rd Party
+
!colspan="7" style="background-color: #A9BCF5;"|3rd Party
 
|-
  
|-
 
|[http://libvirt.org libvirt] driver for [[XL]]
  
|[http://libvirt.org libvirt] driver for [[XL]]
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|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6"|<big>Features</big>
 +
!colspan="7"|<big>Features</big>
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|Advanced Memory Management
+
!colspan="7" style="background-color: #A9BCF5;"|Advanced Memory Management
 
|-
  
|-
 
|Memory Ballooning
  
|Memory Ballooning
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|-
  
|-
 
|Memory Sharing<br/><small>allow sharing of identical pages between HVM guests</small>
  
|Memory Sharing<br/><small>allow sharing of identical pages between HVM guests</small>
−
|{{HalfDone}}<small>tech preview</small>
 +
|{{HalfDone}}<small>preview</small>
−
|{{HalfDone}}<small>tech preview</small>
 +
|{{HalfDone}}<small>preview</small>
−
|{{HalfDone}}<small>tech preview</small> <sup>[ [[#Foot3|3]] ]</sup>
 +
|{{HalfDone}}<small>preview</small> <sup>[ [[#Foot3|3]] ]</sup>
−
|{{HalfDone}}<small>tech preview</small> <sup>[ [[#Foot3|3]] ]</sup>
 +
|{{HalfDone}}<small>preview</small> <sup>[ [[#Foot3|3]] ]</sup>
−
|{{HalfDone}}<small>tech preview</small> <sup>[ [[#Foot3|3]] ]</sup>
 +
|{{HalfDone}}<small>preview</small> <sup>[ [[#Foot3|3]] ]</sup>
 
|-
  
|-
 
|Memory Paging<br/><small>allow pages belonging to HVM guests to be paged to disk</small>
  
|Memory Paging<br/><small>allow pages belonging to HVM guests to be paged to disk</small>
−
|{{HalfDone}}<small>tech preview</small>
 +
|{{HalfDone}}<small>preview</small>
−
|{{HalfDone}}<small>tech preview</small>
 +
|{{HalfDone}}<small>preview</small>
−
|{{HalfDone}}<small>tech preview</small> <sup>[ [[#Foot3|3]] ]</sup>
 +
|{{HalfDone}}<small>preview</small> <sup>[ [[#Foot3|3]] ]</sup>
−
|{{HalfDone}}<small>tech preview</small> <sup>[ [[#Foot3|3]] ]</sup>
 +
|{{HalfDone}}<small>preview</small> <sup>[ [[#Foot3|3]] ]</sup>
−
|{{HalfDone}}<small>tech preview</small> <sup>[ [[#Foot3|3]] ]</sup>
 +
|{{HalfDone}}<small>preview</small> <sup>[ [[#Foot3|3]] ]</sup>
 
|-
  
|-
 
|[http://oss.oracle.com/projects/tmem/ TMEM] - Transcendent Memory
  
|[http://oss.oracle.com/projects/tmem/ TMEM] - Transcendent Memory
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|{{HalfDone}}<small>experimental</small> <sup>[ [[#Foot2|2]] ]</sup>
  
|{{HalfDone}}<small>experimental</small> <sup>[ [[#Foot2|2]] ]</sup>
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|Resource Management
+
!colspan="7" style="background-color: #A9BCF5;"|Resource Management
 
|-
  
|-
 
|[[Xen_4.2:_cpupools|Cpupool]]<br/><small>advanced partitioning</small>
  
|[[Xen_4.2:_cpupools|Cpupool]]<br/><small>advanced partitioning</small>
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|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|Scalability
+
!colspan="7" style="background-color: #A9BCF5;"|Scalability
 
|-
  
|-
 
|1GB/2MB super page support
  
|1GB/2MB super page support
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|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|Interoperability / Hardware Support
 +
!colspan="7" style="background-color: #A9BCF5;"|Interoperability / Hardware Support
 
|-
  
|-
 
|[[Introduction_to_Nested_Virtualization_in_Xen|Nested Virtualisation]]<br/><small>Running a hypervisor inside an HVM guest</small>
  
|[[Introduction_to_Nested_Virtualization_in_Xen|Nested Virtualisation]]<br/><small>Running a hypervisor inside an HVM guest</small>
Line 320: Line 327:
 
|{{HalfDone}}<small>experimental</small>
  
|{{HalfDone}}<small>experimental</small>
 
|{{HalfDone}}<small>experimental</small>
  
|{{HalfDone}}<small>experimental</small>
−
|{{HalfDone}}<small>tech preview</small>
 +
|{{HalfDone}}<small>preview</small>
 
|-
  
|-
 
|HVM PXE Stack
  
|HVM PXE Stack
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|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|High Availability and Fault Tolerance
 +
!colspan="7" style="background-color: #A9BCF5;"|High Availability and Fault Tolerance
 
|-
  
|-
 
|Live Migration, Save & Restore
  
|Live Migration, Save & Restore
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|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|Network and Storage
 +
!colspan="7" style="background-color: #A9BCF5;"|Network and Storage
 
|-
  
|-
 
|[[Blktap2]]
  
|[[Blktap2]]
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|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|Security <small>(also see [http://www.slideshare.net/xen_com_mgr/a-brief-tutorial-on-xens-advanced-security-features this presentation] or [[Securing_Xen|this document]])</small>
 +
!colspan="7" style="background-color: #A9BCF5;"|Security <small>(also see [http://www.slideshare.net/xen_com_mgr/a-brief-tutorial-on-xens-advanced-security-features this presentation] or [[Securing_Xen|this document]])</small>
 
|-
  
|-
 
|[[Driver_Domain|Driver Domains]]
  
|[[Driver_Domain|Driver Domains]]
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|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|Tooling
 +
!colspan="7" style="background-color: #A9BCF5;"|Tooling
 
|-
  
|-
 
|gdbsx<br/><small>debugger to debug ELF guests</small>
  
|gdbsx<br/><small>debugger to debug ELF guests</small>
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|{{Tick}}
  
|{{Tick}}
 
|-
  
|-
−
!colspan="6"|<big>Device Models and Virtual Firmware for HVM guests</big>
 +
!colspan="7"|<big>Device Models and Virtual Firmware for HVM guests</big>
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|For X86 Architectures
+
!colspan="7" style="background-color: #A9BCF5;"|For X86 Architectures
 
|-
  
|-
 
|Traditional Device Model<br/><small>Device emulator based on Xen fork of Qemu</small>
  
|Traditional Device Model<br/><small>Device emulator based on Xen fork of Qemu</small>
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|
  
|
 
|
  
|
−
|{{HalfDone}}<small>tech preview</small>
 +
|{{HalfDone}}<small>preview</small>
 
|{{Tick}}<small>default, unless [[Device_Model_Stub_Domains|stubdomains]] are used</small>
  
|{{Tick}}<small>default, unless [[Device_Model_Stub_Domains|stubdomains]] are used</small>
 
|{{Tick}}<small>default, unless [[Device_Model_Stub_Domains|stubdomains]] are used</small>
  
|{{Tick}}<small>default, unless [[Device_Model_Stub_Domains|stubdomains]] are used</small>
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|{{Tick}}<small>experimental</small> <sup>[ [[#Foot4|4]] ]</sup>
  
|{{Tick}}<small>experimental</small> <sup>[ [[#Foot4|4]] ]</sup>
 
|-
  
|-
−
!colspan="6"|<big>PV Bootloader support</big>
 +
!colspan="7"|<big>PV Bootloader support</big>
 
|-
  
|-
−
!colspan="6" style="background-color: #A9BCF5;"|For X86 Architectures
+
!colspan="7" style="background-color: #A9BCF5;"|For X86 Architectures
 
|-
  
|-
 
|[[PyGrub]] support for GRUB 2
  
|[[PyGrub]] support for GRUB 2
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<span id="Foot5"><sup>[ 5 ]</sup> Used as a fallback if ''blkback'' and/or ''blktap2'' are not available</span><br/>
  
<span id="Foot5"><sup>[ 5 ]</sup> Used as a fallback if ''blkback'' and/or ''blktap2'' are not available</span><br/>
 
<span id="Foot6"><sup>[ 6 ]</sup> See [[Xen ARM with Virtualization Extensions]]; basic functionality implemented; lack of real hardware to validate against<br/>
  
<span id="Foot6"><sup>[ 6 ]</sup> See [[Xen ARM with Virtualization Extensions]]; basic functionality implemented; lack of real hardware to validate against<br/>
−
<span id="Foot7"><sup>[ 7 ]</sup> tech preview, depending on test coverage in [[Xen Project Test Days]]<br/>
 +
<span id="Foot7"><sup>[ 7 ]</sup> preview, depending on test coverage in [[Xen Project Test Days]]<br/>
   
 
[[Category:Xen]] [[Category:Users]] [[Category:Fundamentals]]
  
[[Category:Xen]] [[Category:Users]] [[Category:Fundamentals]]

Revision as of 18:58, 19 December 2014

Legend: ✓: Feature ✓: Partial

Xen 4.0 Xen 4.1 Xen 4.2 Xen 4.3 Xen 4.4 Xen 4.5
Initial Release 7 April 2010 25 March 2011 17 Sept 2012 9 July 2013 10 March 2014 TBD
Feature List FL 4.2 FL 4.3 FL 4.4 FL 4.5
Release Notes RN 4.0 RN 4.1 RN 4.2 RN 4.3 RN 4.4 RN 4.5
Supported Mainline Architectures for the hypervisor (Host)
IA-A32 ✓ ✓ ✓ ✗removed
X86-64 ✓ ✓ ✓ ✓ ✓ ✓
Itanium (ia64) ✓ ✓deprecated in this release ✓deprecated ✗removed
ARM v7 + Virtualization Extensions ✓preview [ 6 ] ✓
ARM v8 ✓preview [ 6 ] ✓
Guest Types
For X86 Architectures
Paravirtualised
Traditional Xen Project 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 		✓ ✓ ✓ ✓ ✓
PVH Guest ✓preview
For ARM Architectures
ARM Guest
Optimal combination of full virtualization and PV extensions 		✓preview [ 6 ] ✓
Host Limits
For X86 Architectures
Physical CPUs 128 [ 0 ] >255 4095 4095 4095
Physical RAM 1TB 5TB 5TB 16TB 16TB
For ARM Architectures
Physical CPUs 8 8
Physical RAM 16GB 16GB
Guest Limits
X86 PV Guest Limits
Virtual CPUs 128 >255 512 512 512
Virtual RAM 512GB 512GB 512GB 512GB 512GB
X86 HVM Guest Limits
Virtual CPUs 128 128 256 256 256
Virtual RAM 1TB 1TB 1TB 1TB 1TB
ARM Guest Limits
Virtual CPUs 8 8
Virtual RAM 16GB 16GB
Number of event channels
Event Channels 1024/4096 1024/4096 1024/4096 1024/4096 131072
Toolstack
Built-in
xend / xm ✓ ✓ ✓deprecated in this release ✓deprecated ✓deprecated ✗removed
XL ✓initial implementation ✓preview release ✓ ✓ ✓
Qemu based disk backend (qdisk) for XL
 ✓ [ 5 ] ✓ [ 5 ] ✓ [ 5 ] ✓ [ 5 ]
XL Open vSwitch integration ✓preview [ 7 ] ✓
3rd Party
libvirt driver for XL ✓ ✓ ✓ ✓
Features
Advanced Memory Management
Memory Ballooning ✓ ✓ ✓ ✓ ✓
Memory Sharing
allow sharing of identical pages between HVM guests 		✓preview ✓preview ✓preview [ 3 ] ✓preview [ 3 ] ✓preview [ 3 ]
Memory Paging
allow pages belonging to HVM guests to be paged to disk 		✓preview ✓preview ✓preview [ 3 ] ✓preview [ 3 ] ✓preview [ 3 ]
TMEM - Transcendent Memory ✓experimental [ 2 ] ✓experimental [ 2 ] ✓experimental [ 2 ] ✓experimental [ 2 ] ✓experimental [ 2 ]
Resource Management
Cpupool
advanced partitioning 		✓ ✓ ✓ ✓
Credit 2 Scheduler
designed for latency-sensitive workloads and very large systems. 		✓prototype ✓prototype ✓experimental ✓experimental
NUMA scheduler affinity ✓ ✓
Scalability
1GB/2MB super page support ✓ ✓ ✓ ✓
Deliver events to PVHVM guests using Xen event channels ✓ ✓ ✓ ✓
Interoperability / Hardware Support
Nested Virtualisation
Running a hypervisor inside an HVM guest 		✓experimental ✓experimental ✓preview
HVM PXE Stack gPXE iPXE iPXE iPXE iPXE
Physical CPU Hotplug ✓ ✓ ✓ ✓ ✓
Physical Memory Hotplug ✓ ✓ ✓ ✓ ✓
Support for PV kernels in bzImage format ✓ ✓ ✓ ✓ ✓
PCI Passthrough ✓ ✓ ✓ ✓ ✓
X86 Advanced Vector eXtension (AVX) ✓ [ 4 ] ✓ ✓ ✓
High Availability and Fault Tolerance
Live Migration, Save & Restore ✓ ✓ ✓ ✓ ✓
Remus Fault Tolerance ✓ ✓ ✓ ✓ ✓
vMCE
Forward Machine Check Exceptions to Appropriate guests 		? ? ✓ ✓ ✓
Network and Storage
Blktap2 ✓ ✓ ✓ ✓ ✓
Online resize of virtual disks ✓ ✓ ✓ ✓ ✓
Security (also see this presentation or this document)
Driver Domains ✓ ✓ ✓ ✓ ✓
Device Model Stub Domains ✓ ✓ ✓ ✓ ✓
Memaccess API
enabling integration of 3rd party security solutions into Xen virtualized environments 		✓ ✓ ✓ ✓
XSM & FLASK
mandatory access control policy providing fine-grained controls over Xen domains, similar to SELinux 		✓ ✓ ✓ ✓ ✓
XSM & FLASK support for IS_PRIV ✓ ✓
vTPM Support
 ✓ ✓ ✓ ✓
updates and new functionality 		✓
Tooling
gdbsx
debugger to debug ELF guests 		✓ ✓ ✓ ✓ ✓
vPMU
Virtual Performance Management Unit for HVM guests 		✓ [ 4 ] ✓ [ 4 ] ✓ [ 4 ] ✓ [ 4 ] ✓ [ 4 ]
Serial console ✓ ✓ ✓ ✓Add EHCI debug support ✓
xentrace
performance analysis 		✓ ✓ ✓ ✓ ✓
Device Models and Virtual Firmware for HVM guests
For X86 Architectures
Traditional Device Model
Device emulator based on Xen fork of Qemu 		✓ ✓ ✓ ✓ ✓
Qemu Upstream Device Model
Device emulator based on upstream Qemu 		✓preview ✓default, unless stubdomains are used ✓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 		✓experimental [ 4 ] ✓experimental [ 4 ] ✓experimental [ 4 ]
PV Bootloader support
For X86 Architectures
PyGrub support for GRUB 2 ✓ ✓ ✓ ✓ ✓
PyGrub support for /boot on ext4 ✓ ✓ ✓ ✓ ✓
pvnetboot support
Bootloader supporting network boot of PV guests 		✓ ✓ ✓

[ 0 ] Compile time limit, can be increased
[ 1 ] Requires hardware virtualisation support
[ 2 ] Disabled 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 ] preview, depending on test coverage in Xen Project Test Days

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