[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] existing VMs and future Xen versions
Thanks for the terrific explanation. I'm presently on 4.4 and I need to setup some Windows VMs in the short term. I plan to upgrade my hardware in the medium term and will likely grab the latest Xen version. I can probably hold off till 4.6. On Mon, Mar 30, 2015 at 5:15 PM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote: > On Mon, 2015-03-30 at 15:38 +0800, H C wrote: >> Hi, >> >> Can VMs created in an older version of Xen work in newer versions? I >> have 4.4 running and am planning to invest in some licensed OSes >> (activating some Windows Licenses on a vms running in 4.4) . Will I >> be stuck on 4,4 or does Xen have upgrade paths for VMs? How is this >> sort of thing typically planned for? > > Yes, this sort of compatibility is in general supported. The Xen > hypercall guest interface (used by PV and PVHVM guests) has been > supported in a stable and backwards compatible manner since Xen 3.0. > > Windows licensing goes a bit further and (AIUI) operates on a points > system based on h/w changes. So it may occasionally be necessary to > tweak to your configuration when switching to a new version to retain > previous behaviour. > > For example if you had installed on Xen <=4.2, which by default used the > qemu-xen-tradition device model then when you upgraded to Xen >=4.3, > which switched to the qemu-xen device model by default, then you would > need to explicitly ask to use qemu-xen-traditional in the domain > configuration, otherwise the switch in the emulated hardware might be > enough to trigger reactivation. > > This sort of thing isn't very frequent though and in most cases things > just work or the changes aren't enough trigger reactivation. > > Ian. > _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxx http://lists.xen.org/xen-users
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