On Fri, Aug 01, 2014 at 08:12:11PM +0100, Alex Bligh wrote: > This patch series adds inbound migrate capability from qemu-kvm version > 1.0. The main ideas are those set out in Cole Robinson's patch here: > http://pkgs.fedoraproject.org/cgit/qemu.git/tree/0001-Fix-migration-from-qemu-kvm.patch?h=f20 > however, rather than patching statically (and breaking inbound > migration on existing machine types), I have added a new machine > type (pc-1.0-qemu-kvm) without affecting any other machine types. > The existing pc-1.0 machine type is renamed to pc-1.0-qemu-git, > with pc-1.0 becoming an alias for one or another, as selected > by a configure option (defaulting to pc-1.0-qemu-git, IE no > change). > > This requires 'hot patching' the VMStateDescription in a couple of > places, which in turn is less than obvious as there may be (indeed > are for i8259) derived classes. Whilst pretty nausea-inducing, this > approach has the benefit of being entirely self-contained. Ow come on. Just add a flag and select the appropriate format based on it, using field_exists. > I developed this on qemu 2.0 but have forward ported it (trivially) > to master. My testing has been on a VM live-migrated-to-file from > Ubuntu Precise qemu-kvm 1.0. > > I have given this a moderate degree of testing but it could do > with more. > > Note that certain hardware devices (including QXL) will not > migrate properly due to a fundamental difference in their internal > state between versions. > > Also note that (as expected) migratino from qemu-2.x to qemu-1.0 > will not work, even if the machine types are the same. > > Alex Bligh (2): > Add machine type pc-1.0-qemu-kvm for live migrate compatibility with > qemu-kvm > Add configure option --enable-pc-1-0-qemu-kvm > > configure | 12 ++++++++++++ > hw/acpi/piix4.c | 49 ++++++++++++++++++++++++++++++++++++++++++++-- > hw/i386/pc_piix.c | 39 +++++++++++++++++++++++++++++++++++- > hw/timer/i8254_common.c | 41 ++++++++++++++++++++++++++++++++++++++ > include/hw/acpi/piix4.h | 1 + > include/hw/timer/i8254.h | 2 ++ > 6 files changed, 141 insertions(+), 3 deletions(-) > > -- > 1.7.9.5 -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list