Re: [Qemu-devel] [PATCH 3/3] tests/acceptance/migration: test to migrate will all machine types

[David Gibson <david@gibson.dropbear.id.au>]

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On Tue, Sep 17, 2019 at 10:44:25AM +0100, Dr. David Alan Gilbert wrote:
> * Balamuruhan S (bala24@linux.ibm.com) wrote:
> > On Mon, Sep 16, 2019 at 03:50:06PM +0100, Dr. David Alan Gilbert wrote:
> > > * Balamuruhan S (bala24@linux.ibm.com) wrote:
> > > > add migration test to query machine types supported by qemu binary
> > > > and migrate vm will all supported type.
> > > > 
> > > > Signed-off-by: Balamuruhan S <bala24@linux.ibm.com>
> > > 
> > > Depending on the architecture you might find that some machine types
> > > aren't migratable while some are.
> > 
> > Thanks Dave, is there a way to query/check whether a machine type on the
> > architecture is migratable or should we try migrating and handle exception
> > on failure ?
> 
> I don't know a way to detect it; you can add -only-migratable to get
> qemu to fai early if a device is declared as being non-migratable; but
> that still doesn't say that all the devices have actually been tested
> migrating.

At present we kind of have an informal distinction between those
machine types that are mature and maintained enough to support
migration (which I think is just pc, q35, pseries and arm virt) and
those which aren't.

There isn't, as far as I know, a way to detect this.

I know we've mentioned at least briefly the idea of formalizing this
distinction at qemu summit, but I don't think the discussion went
anywhere.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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