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From: Thomas Mueller <thomas@chaschperli.ch>
Date: Thu, 13 Nov 2008 09:53:26 +0000 (UTC)
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Subject: [Qemu-devel] Re: [5694] Reintroduce migrate-to-exec: support
	(Charles	Duffy)
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To: qemu-devel@nongnu.org

On Tue, 11 Nov 2008 16:46:33 +0000, Anthony Liguori wrote:

> Revision: 5694
>           http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5694
> Author:   aliguori
> Date:     2008-11-11 16:46:33 +0000 (Tue, 11 Nov 2008)
> 
> Log Message:
> -----------
> Reintroduce migrate-to-exec: support (Charles Duffy)
> 
> KVM's live migration support included support for exec: URLs, allowing
> system state to be written or received via an arbitrary popen()ed
> subprocess. This provides a convenient way to pipe state through a
> compression algorithm or an arbitrary network transport on its way to
> its destination, and a convenient way to write state to disk; libvirt's
> qemu driver currently uses migration to exec: targets for this latter
> purpose.
> 
> This version of the patch refactors now-common code from migrate-tcp.c
> into migrate.c.


i applied this patch to the kvm-79 qemu.  

save and restore works with "migration exec:cat >/tmp/vm.state"/"-
incoming exec:cat /tmp/vm.state", altough there is an segfault logged to 
syslog:

[265193.983381] kvm[15017]: segfault at 0 ip 0 sp 7fffb85ecaa8 error 14 
in kvm[400000+1af000]

my system:
Intel E5420, debian etch, kernel 2.6.26

- Thomas