[Xen-users] HVM with PV Drivers - Live Migration broken?

["Robert Dunkley" <Robert@xxxxxxxxx>]

I upgraded both servers from 3.3.0 to 3.3.1 today, a few important bug
fixes for my setup:
HPET timer mechanism now works for Domus (Outcome is that time drift has
stopped)
Seems AMD CPUID fix no longer needed for GPLPV Domus

DomU to DomU Network performance is identical (160Mbit). Live migration
of the Linux HVM with PV drivers still does exactly the same. All
Windows VMs with GPLPV drivers seem to behave differently during live
migration now, they actually complete migration and all looks well from
Dom0 but the network does not come backup. I can log in to console but
the VMs are usually in a sort of broken state (eg. Screensaver active
but when you move mouse to clear it no login box appears just the
windows background or login box present but ctrl-alt-del does nothing).
The VMs don't seem to BSOD or freeze, anyone know this is a Live
migration bug in GPLPV Pre13/Pre3?

Is there a GPL PV driver that is known to work well with Live Migration?

Thanks,

Rob


-----Original Message-----
From: James Harper [mailto:james.harper@xxxxxxxxxxxxxxxx] 
Sent: 22 January 2009 09:11
To: Robert Dunkley; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-devel] HVM with PV Drivers - Live Migration broken?

> Hi Everyone,
> 
> For some reason I cannot migrate HVMs using paravirt drivers. I have
> asked the user list but no one seems to know why.
> 
> Non para Windows and Linux HVMs migrate OK on my setup but systems
> running the Windows GPLPV drivers or Linux KMod paradrivers get stuck,
> the receiving Dom0 shows the domain in a paused state and the sending
> Dom0 show the domain with migrating- added to the beginning of the
name
> but it never completes.
> 
> I'm running Xen 3.3.0 on Centos 5.2 with DRBD 8.2.6 for shared
storage,
> NUMA enabled. The VMs will transfer live if I order the transfer very
> quickly after starting them (I presume this is because the PV drivers
> have not yet loaded). Is this likely a bug or some sort of
configuration
> issue?
> 

GPLPV has had an on-again off-again love affair with live migration. It
would likely be a bug except that you say that the Linux PV-on-HVM
drivers won't migrate either?

What version of GPLPV are you using?

James


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