Re: [Xen-devel] live migration to qemu.git fails

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Fri, Aug 05, 2016 at 03:37:32PM +0200, Olaf Hering wrote:
> On Wed, Aug 03, Olaf Hering wrote:
> 
> > On Wed, Aug 03, Anthony PERARD wrote:
> > 
> > > Haven't you try to create a guest with Xen 4.5 and qemu-xen-4.5, and
> > > then migrate to Xen 4.7 with QEMU-2.6/master?
> > 
> > In the end I tried xen-4.5/6/7/8 as source and their qemu-xen, and
> > migrated to qemu#master. All failed.
> 
> Today I built qemu binaries from stable-2.4/stable-2.5/v2.6.0 to prepare
> a bisect. Because 2.4/2.5 does not compile with staging-4.7 I went back
> to staging-4.6.

Well, 4.7 introduces new libraries and older QEMUs do not support it out
of the box. You'll need to add some CFLAGS and LDFLADS to have them
working, like does xen.git (staging-4.7) when compiling qemu-xen.

If you compile older qemu out if xen tree, you would need to at least
add:
--extra-cflags="-DXC_WANT_COMPAT_EVTCHN_API=1 -DXC_WANT_COMPAT_GNTTAB_API=1 
-DXC_WANT_COMPAT_MAP_FOREIGN_API=1"

> And to my surprise live migration works in every
> combination I have tried. Not sure what went wrong with earlier testing.

Good to hear.

Thanks,

-- 
Anthony PERARD

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