Diff for /wikisrc/ports/xen/howto.mdwn between versions 1.205 and 1.206

version 1.205, 2021/03/15 23:01:56 version 1.206, 2021/04/15 15:21:25
Line 152  In order to install a NetBSD as a dom0,  Line 152  In order to install a NetBSD as a dom0, 
 NetBSD system, and then pivot the install to a dom0 install by  NetBSD system, and then pivot the install to a dom0 install by
 changing the kernel and boot configuration.  changing the kernel and boot configuration.
   
   NB: As of 2021-04, you must arrange to have the system use BIOS boot,
   not EFI boot.  (Perhaps, with recent current and using multiboot
   instead of NetBSD boot, this might not be true.)
   
 In 2018-05, trouble booting a dom0 was reported with 256M of RAM: with  In 2018-05, trouble booting a dom0 was reported with 256M of RAM: with
 512M it worked reliably.  This does not make sense, but if you see  512M it worked reliably.  This does not make sense, but if you see
 "not ELF" after Xen boots, try increasing dom0 RAM.  "not ELF" after Xen boots, try increasing dom0 RAM.
Line 354  disabled in XEN3_DOM0. Line 358  disabled in XEN3_DOM0.
   
 ## Updating Xen in a dom0  ## Updating Xen in a dom0
   
 Basically, update the xenkernel and xentools packages and copy the new  Note the previous advice to maintain a working and tested boot config
 Xen kernel into place, and reboot.  This procedure should be usable to  into GENERIC without Xen.
 update to a new Xen release, but the reader is reminded that having a  
 non-Xen boot methods was recommended earlier.  Updating Xen in a dom0 consists of updating the xnekernel and xentools
   packages, along with copying the xen.gz into place, and of course
   rebooting.
   
   If updating along a Xen minor version, e.g. from 4.13.1 to 4.13.2, or
   from 4.13.2nb1 to 4.13.2nb3, it is very likely that this can be done
   on a running system.  The point is that the xentools programs will be
   replaced, and you will be using "xl" from the new installation to talk
   to the older programs which are still running.  Problems from this
   update path should be reported.
   
   For added safety, shutdown all domUs before updating, to remove the
   need for new xl to talk to old xenstored.  Note that Xen does not
   guarantee stability of internal ABIs.
   
   If updating across Xen minor versions, e.g. from 4.11 to 4.13, the
   likelihood of trouble is increased.  Therefore, 'make replace' of
   xentools on a dom0 with running domUs is not recommended.  A shutdown
   on all domUs before replacing xentools is likely sufficient.  A safer
   appraoch is to boot into GENERIC to replace the packages, as then no
   Xen code will be running.  Single user is another option.
   
 ## Updating NetBSD in a dom0  ## Updating NetBSD in a dom0
   

Removed from v.1.205  
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  Added in v.1.206


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