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Date: Thu, 22 Sep 2016 11:45:14 +0530
From: Bharata B Rao <bharata@linux.vnet.ibm.com>
Reply-To: bharata@linux.vnet.ibm.com
References: <20160922052105.GD7915@in.ibm.com>
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Subject: Re: [Qemu-devel] pseries-2.6 migration from QEMU-2.6 to QEMU-2.7
 broken
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To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: qemu-devel@nongnu.org, qemu-ppc@nongnu.org, david@gibson.dropbear.id.au, clg@kaod.org, "Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>

On Thu, Sep 22, 2016 at 04:07:21PM +1000, Benjamin Herrenschmidt wrote:
> On Thu, 2016-09-22 at 10:51 +0530, Bharata B Rao wrote:
> > The flag values are expected to remain same for a machine version for
> > the migration to succeed, but this expectation is broken now. Should
> > we make the addition of these flags conditional on machine type
> > version ?
> > But these flags are part of POWER8 CPU definition which is common for
> > both pseries and upcoming powernv.
> 
> Does this affect KVM ? (And if yes why on earth would KVM give a flying
> f*** about the TCG instruction flags ?) ... If not, then I think we can
> safely not care.

Yes, KVM migration is broken.

Regards,
Bharata.