Re: [Xen-devel] [Bug 1759] Xen 4.0.1 live migration/restore over-writes new hypervisor's boot-time record

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 13/04/2011 17:25, "Tim M" <bugs@xxxxxxxxxxxxxx> wrote:

> It was suggested that I submit this to xen-devel in addition to the bug
> report.
> 
> 
> I am having the exact problem described in bug 1282. The RedHat 5 errata for
> Xen 3 describes the problem nicely so I will quote it:
> 
> xen calculates its running time by adding the hypervisor's up-time to the
> hypervisor's boot-time record. In live migrations of para-virtualized
> guests, however, the guest would over-write the new hypervisor's boot-time
> record with the boot-time of the previous hypervisor. This caused
> time-dependent processes on the guests to fail
> 
> This bug was apparently fixed in 3.1.1
> (http://xenbits.xen.org/hg/xen-unstable.hg/rev/359707941ae8) but I am having
> the issue now with Xen 4.0.1 on Debian Squeeze.
> 
> Did something change with the migrate/restore process so the previous fix no
> longer applies?

The fix is still there, albeit in a modified form since the restore code has
changed quite a bit since Xen 3. Can you reliably repro this, with any PV
guest?

 -- Keir

> Thanks in advance for any help
> 
> 
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