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Date: Wed, 2 Dec 2009 10:44:08 -0600
From: Ryan Harper <ryanh@us.ibm.com>
Message-ID: <20091202164408.GQ27346@us.ibm.com>
References: <4B1686AB.4020206@siemens.com>
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Subject: [Qemu-devel] Re: Live migration of x86-64 kvm guests broken?
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Liran Schour <LIRANS@il.ibm.com>, Pierre Riteau <Pierre.Riteau@irisa.fr>, qemu-devel <qemu-devel@nongnu.org>, kvm <kvm@vger.kernel.org>, Juan Quintela <quintela@redhat.com>

* Jan Kiszka <jan.kiszka@siemens.com> [2009-12-02 09:28]:
> Hi,
> 
> I'm facing stalled x86-64 guests after live migration when using kvm
> (share disk images). This does not happen with x86-32 guests or when
> disabling kvm. Both qemu and qemu-kvm git heads are affected (recent
> vmstate fixes applied). Running I/O load during the migration (e.g. a
> simple "ls -R /") seems to trigger it reliably.
> 
> Can anyone confirm / comment on this? Do we fail to restore some magic
> state that only long mode cares about?

Just tested upstream qemu.git (with vmstate fixes) and I could migrate
RHEL 5.3 64-bit guest with your light io load over localhost.  I'll try
remote hosts next.


-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
ryanh@us.ibm.com