Diff for /wikisrc/ports/xen/howto.mdwn between versions 1.168 and 1.177

version 1.168, 2020/04/03 10:48:35 version 1.177, 2020/11/13 20:41:56
Line 8  systems which operate in an unprivileged Line 8  systems which operate in an unprivileged
 from the domU systems are forwarded by the Xen hypervisor to the dom0 to be  from the domU systems are forwarded by the Xen hypervisor to the dom0 to be
 fulfilled.  fulfilled.
   
 Xen supports different styles of guest:  Xen supports different styles of guests; see [PV on HVM](https://wiki.xen.org/wiki/PV_on_HVM) and [PVH(v2)](https://wiki.xenproject.org/wiki/PVH_(v2)_Domu) for upstream documentation.
   
 [[!table data="""  [[!table data="""
 Style of guest  |Supported by NetBSD  Style of guest  |Supported by NetBSD
 PV              |Yes (dom0, domU)  PV              |Yes (dom0, domU)
 HVM             |Yes (domU)  HVM             |Yes (domU)
 PVHVM           |No  PVHVM           |current-only (domU)
 PVH             |No  PVHv2           |current-only (domU, dom0 not yet)
 """]]  """]]
   
 In Para-Virtualized (PV) mode, the guest OS does not attempt to access  In Para-Virtualized (PV) mode, the guest OS does not attempt to access
 hardware directly, but instead makes hypercalls to the hypervisor; PV  hardware directly, but instead makes hypercalls to the hypervisor; PV
 guests must be specifically coded for Xen. In HVM mode, no guest  guests must be specifically coded for Xen.
 modification is required; however, hardware support is required, such  
 as VT-x on Intel CPUs and SVM on AMD CPUs.  In HVM mode, no guest modification is required; however, hardware
   support is required, such as VT-x on Intel CPUs and SVM on AMD CPUs.
   The dom0 runs qemu to emulate hardware.
   
   In PVHVM mode, the guest runs as HVM, but additionally can use PV
   drivers for efficiency.
   
   In PVHv2H mode, operation is similar to PVHVM, except that qemu is not
   run and thus the PV interfaces for console, disks, networking are the
   only way to access these resources.
   
 At boot, the dom0 kernel is loaded as a module with Xen as the kernel.  At boot, the dom0 kernel is loaded as a module with Xen as the kernel.
 The dom0 can start one or more domUs.  (Booting is explained in detail  The dom0 can start one or more domUs.  (Booting is explained in detail
Line 35  website](http://www.xenproject.org/). Line 44  website](http://www.xenproject.org/).
   
 [[!toc]]  [[!toc]]
   
 #Versions and Support  # Versions and Support
   
 In NetBSD, Xen is provided in pkgsrc, via matching pairs of packages  In NetBSD, Xen is provided in pkgsrc, via matching pairs of packages
 xenkernel and xentools.  We will refer only to the kernel versions,  xenkernel and xentools.  We will refer only to the kernel versions,
Line 46  Versions available in pkgsrc: Line 55  Versions available in pkgsrc:
   
 [[!table data="""  [[!table data="""
 Xen Version     |Package Name   |Xen CPU Support        |xm?    |EOL'ed By Upstream  Xen Version     |Package Name   |Xen CPU Support        |xm?    |EOL'ed By Upstream
 4.2             |xenkernel42    |i386 x86_64            |yes    |Yes  
 4.5             |xenkernel45    |x86_64                 |       |Yes  
 4.6             |xenkernel46    |x86_64                 |       |Yes  
 4.8             |xenkernel48    |x86_64                 |       |Yes  
 4.11            |xenkernel411   |x86_64                 |       |No  4.11            |xenkernel411   |x86_64                 |       |No
   4.13            |xenkernel413   |x86_64                 |       |No
 """]]  """]]
   
 See also the [Xen Security Advisory page](http://xenbits.xen.org/xsa/).  See also the [Xen Security Advisory page](http://xenbits.xen.org/xsa/).
Line 67  Note: NetBSD support is called XEN3.  Ho Line 73  Note: NetBSD support is called XEN3.  Ho
 because the hypercall interface has remained identical.  because the hypercall interface has remained identical.
   
 Older Xen had a python-based management tool called xm, now replaced  Older Xen had a python-based management tool called xm, now replaced
 by xl.  xm is obsolete, but 4.2 remains in pkgsrc because migrating  by xl.
 from xm to xl is not always trivial, and because 4.2 is the last  
 version to run on an i386 dom0.  
   
 Architecture  Architecture
 ------------  ------------
   
 Xen 4.5 and later runs on x86_64 hardware (the NetBSD amd64 port).  Xen 4.5 and later runs on x86_64 hardware (the NetBSD amd64 port).
 Xen 4.2 can in theory use i386 hardware, but we do not have  There is a concept of Xen running on ARM, but there are no reports of this working with NetBSD.
 recent reports of success.  
   
 The dom0 system, plus each domU, can be either i386PAE or amd64.  
 i386 without PAE is not supported.  
   
 The standard approach is to use NetBSD/amd64 for the dom0.  
   
 To use an i386PAE dom0 (other than on 4.2), one must build or obtain a  The dom0 system should be amd64.  (Instructions for i386PAE dom0 have been removed from the HOWTO.)
 64bit Xen kernel and install it on the system.  
   
 For domUs, i386PAE is considered as  The domU can be i386PAE or amd64.
 [faster](https://lists.xen.org/archives/html/xen-devel/2012-07/msg00085.html)  i386PAE at one point was considered as [faster](https://lists.xen.org/archives/html/xen-devel/2012-07/msg00085.html) than amd64.
 than amd64.  
   
 # Creating a dom0  # Creating a dom0
   
Line 337  will trigger controlled shutdowns of all Line 333  will trigger controlled shutdowns of all
 CPU and memory  CPU and memory
 --------------  --------------
   
 A domain is provided with some number of vcpus, less than the number  A domain is provided with some number of vcpus, up to the number
 of CPUs seen by the hypervisor. For a domU, it is controlled  of CPUs seen by the hypervisor. For a domU, it is controlled
 from the config file by the "vcpus = N" directive.  from the config file by the "vcpus = N" directive.
   
Line 630  note that only the "xpci" lines are unus Line 626  note that only the "xpci" lines are unus
         cd*     at scsibus? target ? lun ?      # SCSI CD-ROM drives          cd*     at scsibus? target ? lun ?      # SCSI CD-ROM drives
   
   
 #NetBSD as a domU in a VPS  # Specific Issues
   
   ## domU
   
   [NetBSD 5 is known to panic.](http://mail-index.netbsd.org/port-xen/2018/04/17/msg009181.html)
   (However, NetBSD 5 systems should be updated to a supported version.)
   
   # NetBSD as a domU in a VPS
   
 The bulk of the HOWTO is about using NetBSD as a dom0 on your own  The bulk of the HOWTO is about using NetBSD as a dom0 on your own
 hardware.  This section explains how to deal with Xen in a domU as a  hardware.  This section explains how to deal with Xen in a domU as a

Removed from v.1.168  
changed lines
  Added in v.1.177


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